8107 lines
291 KiB
C++
8107 lines
291 KiB
C++
/*
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* VersionedBTree.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "flow/flow.h"
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#include "fdbserver/IVersionedStore.h"
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#include "fdbserver/IPager.h"
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#include "fdbclient/Tuple.h"
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#include "flow/serialize.h"
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#include "flow/genericactors.actor.h"
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#include "flow/UnitTest.h"
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#include "fdbserver/IPager.h"
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#include "fdbrpc/IAsyncFile.h"
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#include "flow/crc32c.h"
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#include "flow/ActorCollection.h"
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#include <map>
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#include <vector>
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#include "fdbclient/CommitTransaction.h"
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#include "fdbserver/IKeyValueStore.h"
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#include "fdbserver/DeltaTree.h"
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#include <string.h>
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#include "flow/actorcompiler.h"
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#include <cinttypes>
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#include <boost/intrusive/list.hpp>
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#define REDWOOD_DEBUG 0
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#define debug_printf_stream stdout
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#define debug_printf_always(...) \
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{ \
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std::string prefix = format("%s %f %04d ", g_network->getLocalAddress().toString().c_str(), now(), __LINE__); \
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std::string msg = format(__VA_ARGS__); \
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writePrefixedLines(debug_printf_stream, prefix, msg); \
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fflush(debug_printf_stream); \
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}
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#define debug_printf_noop(...)
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#if defined(NO_INTELLISENSE)
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#if REDWOOD_DEBUG
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#define debug_printf debug_printf_always
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#else
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#define debug_printf debug_printf_noop
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#endif
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#else
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// To get error-checking on debug_printf statements in IDE
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#define debug_printf printf
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#endif
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#define BEACON debug_printf_always("HERE\n")
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#define TRACE \
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debug_printf_always("%s: %s line %d %s\n", __FUNCTION__, __FILE__, __LINE__, platform::get_backtrace().c_str());
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// Writes prefix:line for each line in msg to fout
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void writePrefixedLines(FILE* fout, std::string prefix, std::string msg) {
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StringRef m = msg;
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while (m.size() != 0) {
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StringRef line = m.eat("\n");
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fprintf(fout, "%s %s\n", prefix.c_str(), line.toString().c_str());
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}
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}
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// Some convenience functions for debugging to stringify various structures
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// Classes can add compatibility by either specializing toString<T> or implementing
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// std::string toString() const;
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template <typename T>
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std::string toString(const T& o) {
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return o.toString();
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}
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std::string toString(StringRef s) {
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return s.printable();
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}
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std::string toString(LogicalPageID id) {
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if (id == invalidLogicalPageID) {
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return "LogicalPageID{invalid}";
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}
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return format("LogicalPageID{%u}", id);
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}
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std::string toString(Version v) {
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if (v == invalidVersion) {
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return "invalidVersion";
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}
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return format("@%" PRId64, v);
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}
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std::string toString(bool b) {
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return b ? "true" : "false";
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}
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template <typename T>
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std::string toString(const Standalone<T>& s) {
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return toString((T)s);
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}
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template <typename T>
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std::string toString(const T* begin, const T* end) {
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std::string r = "{";
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bool comma = false;
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while (begin != end) {
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if (comma) {
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r += ", ";
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} else {
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comma = true;
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}
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r += toString(*begin++);
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}
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r += "}";
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return r;
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}
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template <typename T>
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std::string toString(const std::vector<T>& v) {
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return toString(&v.front(), &v.back() + 1);
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}
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template <typename T>
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std::string toString(const VectorRef<T>& v) {
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return toString(v.begin(), v.end());
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}
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template <typename T>
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std::string toString(const Optional<T>& o) {
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if (o.present()) {
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return toString(o.get());
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}
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return "<not present>";
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}
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template <typename F, typename S>
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std::string toString(const std::pair<F, S>& o) {
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return format("{%s, %s}", toString(o.first).c_str(), toString(o.second).c_str());
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}
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// A FIFO queue of T stored as a linked list of pages.
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// Main operations are pop(), pushBack(), pushFront(), and flush().
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//
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// flush() will ensure all queue pages are written to the pager and move the unflushed
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// pushFront()'d records onto the front of the queue, in FIFO order.
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//
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// pop() will only return records that have been flushed, and pops
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// from the front of the queue.
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//
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// Each page contains some number of T items and a link to the next page and starting position on that page.
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// When the queue is flushed, the last page in the chain is ended and linked to a newly allocated
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// but not-yet-written-to pageID, which future writes after the flush will write to.
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// Items pushed onto the front of the queue are written to a separate linked list until flushed,
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// at which point that list becomes the new front of the queue.
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//
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// The write pattern is designed such that no page is ever expected to be valid after
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// being written to or updated but not fsync'd. This is why a new unused page is added
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// to the queue, linked to by the last data page, before commit. The new page can't be
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// added and filled with data as part of the next commit because that would mean modifying
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// the previous tail page to update its next link, which risks corrupting it and losing
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// data that was not yet popped if that write is never fsync'd.
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//
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// Requirements on T
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// - must be trivially copyable
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// OR have a specialization for FIFOQueueCodec<T>
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// OR have the following methods
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// // Deserialize from src into *this, return number of bytes from src consumed
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// int readFromBytes(const uint8_t *src);
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// // Return the size of *this serialized
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// int bytesNeeded() const;
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// // Serialize *this to dst, return number of bytes written to dst
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// int writeToBytes(uint8_t *dst) const;
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// - must be supported by toString(object) (see above)
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template <typename T, typename Enable = void>
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struct FIFOQueueCodec {
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static T readFromBytes(const uint8_t* src, int& bytesRead) {
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T x;
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bytesRead = x.readFromBytes(src);
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return x;
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}
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static int bytesNeeded(const T& x) { return x.bytesNeeded(); }
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static int writeToBytes(uint8_t* dst, const T& x) { return x.writeToBytes(dst); }
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};
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template <typename T>
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struct FIFOQueueCodec<T, typename std::enable_if<std::is_trivially_copyable<T>::value>::type> {
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static_assert(std::is_trivially_copyable<T>::value);
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static T readFromBytes(const uint8_t* src, int& bytesRead) {
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bytesRead = sizeof(T);
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return *(T*)src;
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}
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static int bytesNeeded(const T& x) { return sizeof(T); }
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static int writeToBytes(uint8_t* dst, const T& x) {
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*(T*)dst = x;
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return sizeof(T);
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}
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};
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template <typename T, typename Codec = FIFOQueueCodec<T>>
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class FIFOQueue {
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public:
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#pragma pack(push, 1)
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struct QueueState {
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bool operator==(const QueueState& rhs) const { return memcmp(this, &rhs, sizeof(QueueState)) == 0; }
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LogicalPageID headPageID = invalidLogicalPageID;
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LogicalPageID tailPageID = invalidLogicalPageID;
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uint16_t headOffset;
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// Note that there is no tail index because the tail page is always never-before-written and its index will
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// start at 0
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int64_t numPages;
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int64_t numEntries;
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std::string toString() const {
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return format("{head: %s:%d tail: %s numPages: %" PRId64 " numEntries: %" PRId64 "}",
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::toString(headPageID).c_str(), (int)headOffset, ::toString(tailPageID).c_str(), numPages,
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numEntries);
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}
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};
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#pragma pack(pop)
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struct Cursor {
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enum Mode { NONE, POP, READONLY, WRITE };
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// The current page being read or written to
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LogicalPageID pageID;
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// The first page ID to be written to the pager, if this cursor has written anything
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LogicalPageID firstPageIDWritten;
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// Offset after RawPage header to next read from or write to
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int offset;
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// A read cursor will not read this page (or beyond)
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LogicalPageID endPageID;
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Reference<IPage> page;
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FIFOQueue* queue;
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Future<Void> operation;
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Mode mode;
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Cursor() : mode(NONE) {}
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// Initialize a cursor.
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void init(FIFOQueue* q = nullptr, Mode m = NONE, LogicalPageID initialPageID = invalidLogicalPageID,
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int readOffset = 0, LogicalPageID endPage = invalidLogicalPageID) {
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if (operation.isValid()) {
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operation.cancel();
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}
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queue = q;
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mode = m;
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firstPageIDWritten = invalidLogicalPageID;
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offset = readOffset;
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endPageID = endPage;
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page.clear();
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if (mode == POP || mode == READONLY) {
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// If cursor is not pointed at the end page then start loading it.
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// The end page will not have been written to disk yet.
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pageID = initialPageID;
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operation = (pageID == endPageID) ? Void() : loadPage();
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} else {
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pageID = invalidLogicalPageID;
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ASSERT(mode == WRITE ||
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(initialPageID == invalidLogicalPageID && readOffset == 0 && endPage == invalidLogicalPageID));
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operation = Void();
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}
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debug_printf("FIFOQueue::Cursor(%s) initialized\n", toString().c_str());
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if (mode == WRITE && initialPageID != invalidLogicalPageID) {
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addNewPage(initialPageID, 0, true);
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}
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}
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// Since cursors can have async operations pending which modify their state they can't be copied cleanly
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Cursor(const Cursor& other) = delete;
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// A read cursor can be initialized from a pop cursor
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void initReadOnly(const Cursor& c) {
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ASSERT(c.mode == READONLY || c.mode == POP);
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init(c.queue, READONLY, c.pageID, c.offset, c.endPageID);
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}
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~Cursor() { operation.cancel(); }
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std::string toString() const {
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if (mode == WRITE) {
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return format("{WriteCursor %s:%p pos=%s:%d endOffset=%d}", queue->name.c_str(), this,
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::toString(pageID).c_str(), offset, page ? raw()->endOffset : -1);
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}
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if (mode == POP || mode == READONLY) {
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return format("{ReadCursor %s:%p pos=%s:%d endOffset=%d endPage=%s}", queue->name.c_str(), this,
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::toString(pageID).c_str(), offset, page ? raw()->endOffset : -1,
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::toString(endPageID).c_str());
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}
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ASSERT(mode == NONE);
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return format("{NullCursor=%p}", this);
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}
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#pragma pack(push, 1)
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struct RawPage {
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LogicalPageID nextPageID;
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uint16_t nextOffset;
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uint16_t endOffset;
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uint8_t* begin() { return (uint8_t*)(this + 1); }
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};
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#pragma pack(pop)
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Future<Void> notBusy() { return operation; }
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// Returns true if any items have been written to the last page
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bool pendingWrites() const { return mode == WRITE && offset != 0; }
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RawPage* raw() const { return ((RawPage*)(page->begin())); }
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void setNext(LogicalPageID pageID, int offset) {
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ASSERT(mode == WRITE);
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RawPage* p = raw();
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p->nextPageID = pageID;
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p->nextOffset = offset;
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}
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Future<Void> loadPage() {
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ASSERT(mode == POP | mode == READONLY);
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debug_printf("FIFOQueue::Cursor(%s) loadPage\n", toString().c_str());
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return map(queue->pager->readPage(pageID, true), [=](Reference<IPage> p) {
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page = p;
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debug_printf("FIFOQueue::Cursor(%s) loadPage done\n", toString().c_str());
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return Void();
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});
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}
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void writePage() {
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ASSERT(mode == WRITE);
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debug_printf("FIFOQueue::Cursor(%s) writePage\n", toString().c_str());
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VALGRIND_MAKE_MEM_DEFINED(raw()->begin(), offset);
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VALGRIND_MAKE_MEM_DEFINED(raw()->begin() + offset, queue->dataBytesPerPage - raw()->endOffset);
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queue->pager->updatePage(pageID, page);
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if (firstPageIDWritten == invalidLogicalPageID) {
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firstPageIDWritten = pageID;
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}
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}
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// Link the current page to newPageID:newOffset and then write it to the pager.
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// If initializeNewPage is true a page buffer will be allocated for the new page and it will be initialized
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// as a new tail page.
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void addNewPage(LogicalPageID newPageID, int newOffset, bool initializeNewPage) {
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ASSERT(mode == WRITE);
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ASSERT(newPageID != invalidLogicalPageID);
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debug_printf("FIFOQueue::Cursor(%s) Adding page %s init=%d\n", toString().c_str(),
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::toString(newPageID).c_str(), initializeNewPage);
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// Update existing page and write, if it exists
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if (page) {
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setNext(newPageID, newOffset);
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debug_printf("FIFOQueue::Cursor(%s) Linked new page\n", toString().c_str());
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writePage();
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}
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pageID = newPageID;
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offset = newOffset;
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if (initializeNewPage) {
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debug_printf("FIFOQueue::Cursor(%s) Initializing new page\n", toString().c_str());
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page = queue->pager->newPageBuffer();
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setNext(0, 0);
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auto p = raw();
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ASSERT(newOffset == 0);
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p->endOffset = 0;
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} else {
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page.clear();
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}
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}
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// Write item to the next position in the current page or, if it won't fit, add a new page and write it there.
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ACTOR static Future<Void> write_impl(Cursor* self, T item, Future<Void> start) {
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ASSERT(self->mode == WRITE);
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// Wait for the previous operation to finish
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state Future<Void> previous = self->operation;
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wait(start);
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wait(previous);
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state int bytesNeeded = Codec::bytesNeeded(item);
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if (self->pageID == invalidLogicalPageID || self->offset + bytesNeeded > self->queue->dataBytesPerPage) {
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debug_printf("FIFOQueue::Cursor(%s) write(%s) page is full, adding new page\n",
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self->toString().c_str(), ::toString(item).c_str());
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LogicalPageID newPageID = wait(self->queue->pager->newPageID());
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self->addNewPage(newPageID, 0, true);
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++self->queue->numPages;
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wait(yield());
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}
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debug_printf("FIFOQueue::Cursor(%s) before write(%s)\n", self->toString().c_str(),
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::toString(item).c_str());
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auto p = self->raw();
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Codec::writeToBytes(p->begin() + self->offset, item);
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self->offset += bytesNeeded;
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p->endOffset = self->offset;
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++self->queue->numEntries;
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return Void();
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}
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void write(const T& item) {
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Promise<Void> p;
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operation = write_impl(this, item, p.getFuture());
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p.send(Void());
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}
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// Read the next item at the cursor (if <= upperBound), moving to a new page first if the current page is
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// exhausted
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ACTOR static Future<Optional<T>> readNext_impl(Cursor* self, Optional<T> upperBound, Future<Void> start) {
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ASSERT(self->mode == POP || self->mode == READONLY);
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// Wait for the previous operation to finish
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state Future<Void> previous = self->operation;
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wait(start);
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wait(previous);
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debug_printf("FIFOQueue::Cursor(%s) readNext begin\n", self->toString().c_str());
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if (self->pageID == invalidLogicalPageID || self->pageID == self->endPageID) {
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debug_printf("FIFOQueue::Cursor(%s) readNext returning nothing\n", self->toString().c_str());
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return Optional<T>();
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}
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// We now know we are pointing to PageID and it should be read and used, but it may not be loaded yet.
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if (!self->page) {
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wait(self->loadPage());
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wait(yield());
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}
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auto p = self->raw();
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debug_printf("FIFOQueue::Cursor(%s) readNext reading at current position\n", self->toString().c_str());
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ASSERT(self->offset < p->endOffset);
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int bytesRead;
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T result = Codec::readFromBytes(p->begin() + self->offset, bytesRead);
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if (upperBound.present() && upperBound.get() < result) {
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debug_printf("FIFOQueue::Cursor(%s) not popping %s, exceeds upper bound %s\n", self->toString().c_str(),
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::toString(result).c_str(), ::toString(upperBound.get()).c_str());
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return Optional<T>();
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}
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self->offset += bytesRead;
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if (self->mode == POP) {
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--self->queue->numEntries;
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}
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debug_printf("FIFOQueue::Cursor(%s) after read of %s\n", self->toString().c_str(),
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::toString(result).c_str());
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ASSERT(self->offset <= p->endOffset);
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if (self->offset == p->endOffset) {
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debug_printf("FIFOQueue::Cursor(%s) Page exhausted\n", self->toString().c_str());
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LogicalPageID oldPageID = self->pageID;
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self->pageID = p->nextPageID;
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self->offset = p->nextOffset;
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if (self->mode == POP) {
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--self->queue->numPages;
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}
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self->page.clear();
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debug_printf("FIFOQueue::Cursor(%s) readNext page exhausted, moved to new page\n",
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self->toString().c_str());
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if (self->mode == POP) {
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// Freeing the old page must happen after advancing the cursor and clearing the page reference
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// because freePage() could cause a push onto a queue that causes a newPageID() call which could
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// pop() from this very same queue. Queue pages are freed at page 0 because they can be reused after
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// the next commit.
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|
self->queue->pager->freePage(oldPageID, 0);
|
|
}
|
|
}
|
|
|
|
debug_printf("FIFOQueue(%s) %s(upperBound=%s) -> %s\n", self->queue->name.c_str(),
|
|
(self->mode == POP ? "pop" : "peek"), ::toString(upperBound).c_str(),
|
|
::toString(result).c_str());
|
|
return result;
|
|
}
|
|
|
|
// Read and move past the next item if is <= upperBound or if upperBound is not present
|
|
Future<Optional<T>> readNext(const Optional<T>& upperBound = {}) {
|
|
if (mode == NONE) {
|
|
return Optional<T>();
|
|
}
|
|
Promise<Void> p;
|
|
Future<Optional<T>> read = readNext_impl(this, upperBound, p.getFuture());
|
|
operation = success(read);
|
|
p.send(Void());
|
|
return read;
|
|
}
|
|
};
|
|
|
|
public:
|
|
FIFOQueue() : pager(nullptr) {}
|
|
|
|
~FIFOQueue() { newTailPage.cancel(); }
|
|
|
|
FIFOQueue(const FIFOQueue& other) = delete;
|
|
void operator=(const FIFOQueue& rhs) = delete;
|
|
|
|
// Create a new queue at newPageID
|
|
void create(IPager2* p, LogicalPageID newPageID, std::string queueName) {
|
|
debug_printf("FIFOQueue(%s) create from page %s\n", queueName.c_str(), toString(newPageID).c_str());
|
|
pager = p;
|
|
name = queueName;
|
|
numPages = 1;
|
|
numEntries = 0;
|
|
dataBytesPerPage = pager->getUsablePageSize() - sizeof(typename Cursor::RawPage);
|
|
headReader.init(this, Cursor::POP, newPageID, 0, newPageID);
|
|
tailWriter.init(this, Cursor::WRITE, newPageID);
|
|
headWriter.init(this, Cursor::WRITE);
|
|
newTailPage = invalidLogicalPageID;
|
|
debug_printf("FIFOQueue(%s) created\n", queueName.c_str());
|
|
}
|
|
|
|
// Load an existing queue from its queue state
|
|
void recover(IPager2* p, const QueueState& qs, std::string queueName) {
|
|
debug_printf("FIFOQueue(%s) recover from queue state %s\n", queueName.c_str(), qs.toString().c_str());
|
|
pager = p;
|
|
name = queueName;
|
|
numPages = qs.numPages;
|
|
numEntries = qs.numEntries;
|
|
dataBytesPerPage = pager->getUsablePageSize() - sizeof(typename Cursor::RawPage);
|
|
headReader.init(this, Cursor::POP, qs.headPageID, qs.headOffset, qs.tailPageID);
|
|
tailWriter.init(this, Cursor::WRITE, qs.tailPageID);
|
|
headWriter.init(this, Cursor::WRITE);
|
|
newTailPage = invalidLogicalPageID;
|
|
debug_printf("FIFOQueue(%s) recovered\n", queueName.c_str());
|
|
}
|
|
|
|
ACTOR static Future<Standalone<VectorRef<T>>> peekAll_impl(FIFOQueue* self) {
|
|
state Standalone<VectorRef<T>> results;
|
|
state Cursor c;
|
|
c.initReadOnly(self->headReader);
|
|
results.reserve(results.arena(), self->numEntries);
|
|
|
|
loop {
|
|
Optional<T> x = wait(c.readNext());
|
|
if (!x.present()) {
|
|
break;
|
|
}
|
|
results.push_back(results.arena(), x.get());
|
|
}
|
|
|
|
return results;
|
|
}
|
|
|
|
Future<Standalone<VectorRef<T>>> peekAll() { return peekAll_impl(this); }
|
|
|
|
ACTOR static Future<Optional<T>> peek_impl(FIFOQueue* self) {
|
|
state Cursor c;
|
|
c.initReadOnly(self->headReader);
|
|
|
|
Optional<T> x = wait(c.readNext());
|
|
return x;
|
|
}
|
|
|
|
Future<Optional<T>> peek() { return peek_impl(this); }
|
|
|
|
// Pop the next item on front of queue if it is <= upperBound or if upperBound is not present
|
|
Future<Optional<T>> pop(Optional<T> upperBound = {}) { return headReader.readNext(upperBound); }
|
|
|
|
QueueState getState() const {
|
|
QueueState s;
|
|
s.headOffset = headReader.offset;
|
|
s.headPageID = headReader.pageID;
|
|
s.tailPageID = tailWriter.pageID;
|
|
s.numEntries = numEntries;
|
|
s.numPages = numPages;
|
|
|
|
debug_printf("FIFOQueue(%s) getState(): %s\n", name.c_str(), s.toString().c_str());
|
|
return s;
|
|
}
|
|
|
|
void pushBack(const T& item) {
|
|
debug_printf("FIFOQueue(%s) pushBack(%s)\n", name.c_str(), toString(item).c_str());
|
|
tailWriter.write(item);
|
|
}
|
|
|
|
void pushFront(const T& item) {
|
|
debug_printf("FIFOQueue(%s) pushFront(%s)\n", name.c_str(), toString(item).c_str());
|
|
headWriter.write(item);
|
|
}
|
|
|
|
// Wait until the most recently started operations on each cursor as of now are ready
|
|
Future<Void> notBusy() {
|
|
return headWriter.notBusy() && headReader.notBusy() && tailWriter.notBusy() && ready(newTailPage);
|
|
}
|
|
|
|
// Returns true if any most recently started operations on any cursors are not ready
|
|
bool busy() {
|
|
return !headWriter.notBusy().isReady() || !headReader.notBusy().isReady() || !tailWriter.notBusy().isReady() ||
|
|
!newTailPage.isReady();
|
|
}
|
|
|
|
// preFlush() prepares this queue to be flushed to disk, but doesn't actually do it so the queue can still
|
|
// be pushed and popped after this operation. It returns whether or not any operations were pending or
|
|
// started during execution.
|
|
//
|
|
// If one or more queues are used by their pager in newPageID() or freePage() operations, then preFlush()
|
|
// must be called on each of them inside a loop that runs until each of the preFlush() calls have returned
|
|
// false.
|
|
//
|
|
// The reason for all this is that:
|
|
// - queue pop() can call pager->freePage() which can call push() on the same or another queue
|
|
// - queue push() can call pager->newPageID() which can call pop() on the same or another queue
|
|
// This creates a circular dependency with 1 or more queues when those queues are used by the pager
|
|
// to manage free page IDs.
|
|
ACTOR static Future<bool> preFlush_impl(FIFOQueue* self) {
|
|
debug_printf("FIFOQueue(%s) preFlush begin\n", self->name.c_str());
|
|
wait(self->notBusy());
|
|
|
|
// Completion of the pending operations as of the start of notBusy() could have began new operations,
|
|
// so see if any work is pending now.
|
|
bool workPending = self->busy();
|
|
|
|
if (!workPending) {
|
|
// A newly created or flushed queue starts out in a state where its tail page to be written to is empty.
|
|
// After pushBack() is called, this is no longer the case and never will be again until the queue is
|
|
// flushed. Before the non-empty tail page is written it must be linked to a new empty page for use after
|
|
// the next flush. (This is explained more at the top of FIFOQueue but it is because queue pages can only
|
|
// be written once because once they contain durable data a second write to link to a new page could corrupt
|
|
// the existing data if the subsequent commit never succeeds.)
|
|
if (self->newTailPage.isReady() && self->newTailPage.get() == invalidLogicalPageID &&
|
|
self->tailWriter.pendingWrites()) {
|
|
self->newTailPage = self->pager->newPageID();
|
|
workPending = true;
|
|
}
|
|
}
|
|
|
|
debug_printf("FIFOQueue(%s) preFlush returning %d\n", self->name.c_str(), workPending);
|
|
return workPending;
|
|
}
|
|
|
|
Future<bool> preFlush() { return preFlush_impl(this); }
|
|
|
|
void finishFlush() {
|
|
debug_printf("FIFOQueue(%s) finishFlush start\n", name.c_str());
|
|
ASSERT(!busy());
|
|
|
|
// If a new tail page was allocated, link the last page of the tail writer to it.
|
|
if (newTailPage.get() != invalidLogicalPageID) {
|
|
tailWriter.addNewPage(newTailPage.get(), 0, false);
|
|
// The flush sequence allocated a page and added it to the queue so increment numPages
|
|
++numPages;
|
|
|
|
// newPage() should be ready immediately since a pageID is being explicitly passed.
|
|
ASSERT(tailWriter.notBusy().isReady());
|
|
|
|
newTailPage = invalidLogicalPageID;
|
|
}
|
|
|
|
// If the headWriter wrote anything, link its tail page to the headReader position and point the headReader
|
|
// to the start of the headWriter
|
|
if (headWriter.pendingWrites()) {
|
|
headWriter.addNewPage(headReader.pageID, headReader.offset, false);
|
|
headReader.pageID = headWriter.firstPageIDWritten;
|
|
headReader.offset = 0;
|
|
headReader.page.clear();
|
|
}
|
|
|
|
// Update headReader's end page to the new tail page
|
|
headReader.endPageID = tailWriter.pageID;
|
|
|
|
// Reset the write cursors
|
|
tailWriter.init(this, Cursor::WRITE, tailWriter.pageID);
|
|
headWriter.init(this, Cursor::WRITE);
|
|
|
|
debug_printf("FIFOQueue(%s) finishFlush end\n", name.c_str());
|
|
}
|
|
|
|
ACTOR static Future<Void> flush_impl(FIFOQueue* self) {
|
|
loop {
|
|
bool notDone = wait(self->preFlush());
|
|
if (!notDone) {
|
|
break;
|
|
}
|
|
}
|
|
self->finishFlush();
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> flush() { return flush_impl(this); }
|
|
|
|
IPager2* pager;
|
|
int64_t numPages;
|
|
int64_t numEntries;
|
|
int dataBytesPerPage;
|
|
|
|
Cursor headReader;
|
|
Cursor tailWriter;
|
|
Cursor headWriter;
|
|
|
|
Future<LogicalPageID> newTailPage;
|
|
|
|
// For debugging
|
|
std::string name;
|
|
};
|
|
|
|
int nextPowerOf2(uint32_t x) {
|
|
return 1 << (32 - clz(x - 1));
|
|
}
|
|
|
|
class FastAllocatedPage : public IPage, public FastAllocated<FastAllocatedPage>, ReferenceCounted<FastAllocatedPage> {
|
|
public:
|
|
// Create a fast-allocated page with size total bytes INCLUDING checksum
|
|
FastAllocatedPage(int size, int bufferSize) : logicalSize(size), bufferSize(bufferSize) {
|
|
buffer = (uint8_t*)allocateFast(bufferSize);
|
|
// Mark any unused page portion defined
|
|
VALGRIND_MAKE_MEM_DEFINED(buffer + logicalSize, bufferSize - logicalSize);
|
|
};
|
|
|
|
virtual ~FastAllocatedPage() { freeFast(bufferSize, buffer); }
|
|
|
|
virtual Reference<IPage> clone() const {
|
|
FastAllocatedPage* p = new FastAllocatedPage(logicalSize, bufferSize);
|
|
memcpy(p->buffer, buffer, logicalSize);
|
|
return Reference<IPage>(p);
|
|
}
|
|
|
|
// Usable size, without checksum
|
|
int size() const { return logicalSize - sizeof(Checksum); }
|
|
|
|
uint8_t const* begin() const { return buffer; }
|
|
|
|
uint8_t* mutate() { return buffer; }
|
|
|
|
void addref() const { ReferenceCounted<FastAllocatedPage>::addref(); }
|
|
|
|
void delref() const { ReferenceCounted<FastAllocatedPage>::delref(); }
|
|
|
|
typedef uint32_t Checksum;
|
|
|
|
Checksum& getChecksum() { return *(Checksum*)(buffer + size()); }
|
|
|
|
Checksum calculateChecksum(LogicalPageID pageID) { return crc32c_append(pageID, buffer, size()); }
|
|
|
|
void updateChecksum(LogicalPageID pageID) { getChecksum() = calculateChecksum(pageID); }
|
|
|
|
bool verifyChecksum(LogicalPageID pageID) { return getChecksum() == calculateChecksum(pageID); }
|
|
|
|
private:
|
|
int logicalSize;
|
|
int bufferSize;
|
|
uint8_t* buffer;
|
|
};
|
|
|
|
struct RedwoodMetrics {
|
|
static constexpr int btreeLevels = 5;
|
|
|
|
RedwoodMetrics() { clear(); }
|
|
|
|
void clear() {
|
|
memset(this, 0, sizeof(RedwoodMetrics));
|
|
for (auto& level : levels) {
|
|
level = {};
|
|
}
|
|
startTime = g_network ? now() : 0;
|
|
}
|
|
|
|
struct Level {
|
|
unsigned int pageRead;
|
|
unsigned int pageReadExt;
|
|
unsigned int pageBuild;
|
|
unsigned int pageBuildExt;
|
|
unsigned int pageCommitStart;
|
|
unsigned int pageModify;
|
|
unsigned int pageModifyExt;
|
|
unsigned int lazyClearRequeue;
|
|
unsigned int lazyClearRequeueExt;
|
|
unsigned int lazyClearFree;
|
|
unsigned int lazyClearFreeExt;
|
|
unsigned int forceUpdate;
|
|
unsigned int detachChild;
|
|
double buildStoredPct;
|
|
double buildFillPct;
|
|
unsigned int buildItemCount;
|
|
double modifyStoredPct;
|
|
double modifyFillPct;
|
|
unsigned int modifyItemCount;
|
|
};
|
|
|
|
Level levels[btreeLevels];
|
|
|
|
unsigned int opSet;
|
|
unsigned int opSetKeyBytes;
|
|
unsigned int opSetValueBytes;
|
|
unsigned int opClear;
|
|
unsigned int opClearKey;
|
|
unsigned int opCommit;
|
|
unsigned int opGet;
|
|
unsigned int opGetRange;
|
|
unsigned int pagerDiskWrite;
|
|
unsigned int pagerDiskRead;
|
|
unsigned int pagerRemapFree;
|
|
unsigned int pagerRemapCopy;
|
|
unsigned int pagerRemapSkip;
|
|
unsigned int pagerCacheHit;
|
|
unsigned int pagerCacheMiss;
|
|
unsigned int pagerProbeHit;
|
|
unsigned int pagerProbeMiss;
|
|
unsigned int pagerEvictUnhit;
|
|
unsigned int pagerEvictFail;
|
|
unsigned int btreeLeafPreload;
|
|
unsigned int btreeLeafPreloadExt;
|
|
|
|
// Return number of pages read or written, from cache or disk
|
|
unsigned int pageOps() const {
|
|
// All page reads are either a cache hit, probe hit, or a disk read
|
|
return pagerDiskWrite + pagerDiskRead + pagerCacheHit + pagerProbeHit;
|
|
}
|
|
|
|
double startTime;
|
|
|
|
Level& level(unsigned int level) {
|
|
static Level outOfBound;
|
|
if (level == 0 || level > btreeLevels) {
|
|
return outOfBound;
|
|
}
|
|
return levels[level - 1];
|
|
}
|
|
|
|
// This will populate a trace event and/or a string with Redwood metrics.
|
|
// The string is a reasonably well formatted page of information
|
|
void getFields(TraceEvent* e, std::string* s = nullptr, bool skipZeroes = false) {
|
|
std::pair<const char*, unsigned int> metrics[] = { { "BTreePreload", btreeLeafPreload },
|
|
{ "BTreePreloadExt", btreeLeafPreloadExt },
|
|
{ "", 0 },
|
|
{ "OpSet", opSet },
|
|
{ "OpSetKeyBytes", opSetKeyBytes },
|
|
{ "OpSetValueBytes", opSetValueBytes },
|
|
{ "OpClear", opClear },
|
|
{ "OpClearKey", opClearKey },
|
|
{ "", 0 },
|
|
{ "OpGet", opGet },
|
|
{ "OpGetRange", opGetRange },
|
|
{ "OpCommit", opCommit },
|
|
{ "", 0 },
|
|
{ "PagerDiskWrite", pagerDiskWrite },
|
|
{ "PagerDiskRead", pagerDiskRead },
|
|
{ "PagerCacheHit", pagerCacheHit },
|
|
{ "PagerCacheMiss", pagerCacheMiss },
|
|
{ "", 0 },
|
|
{ "PagerProbeHit", pagerProbeHit },
|
|
{ "PagerProbeMiss", pagerProbeMiss },
|
|
{ "PagerEvictUnhit", pagerEvictUnhit },
|
|
{ "PagerEvictFail", pagerEvictFail },
|
|
{ "", 0 },
|
|
{ "PagerRemapFree", pagerRemapFree },
|
|
{ "PagerRemapCopy", pagerRemapCopy },
|
|
{ "PagerRemapSkip", pagerRemapSkip } };
|
|
double elapsed = now() - startTime;
|
|
|
|
if (e != nullptr) {
|
|
for (auto& m : metrics) {
|
|
char c = m.first[0];
|
|
if(c != 0 && (!skipZeroes || m.second != 0) ) {
|
|
e->detail(m.first, m.second);
|
|
}
|
|
}
|
|
}
|
|
|
|
if(s != nullptr) {
|
|
for (auto& m : metrics) {
|
|
if (*m.first == '\0') {
|
|
*s += "\n";
|
|
} else if(!skipZeroes || m.second != 0) {
|
|
*s += format("%-15s %-8u %8u/s ", m.first, m.second, int(m.second / elapsed));
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < btreeLevels; ++i) {
|
|
auto& level = levels[i];
|
|
std::pair<const char*, unsigned int> metrics[] = {
|
|
{ "PageBuild", level.pageBuild },
|
|
{ "PageBuildExt", level.pageBuildExt },
|
|
{ "PageModify", level.pageModify },
|
|
{ "PageModifyExt", level.pageModifyExt },
|
|
{ "", 0 },
|
|
{ "PageRead", level.pageRead },
|
|
{ "PageReadExt", level.pageReadExt },
|
|
{ "PageCommitStart", level.pageCommitStart },
|
|
{ "", 0 },
|
|
{ "LazyClearInt", level.lazyClearRequeue },
|
|
{ "LazyClearIntExt", level.lazyClearRequeueExt },
|
|
{ "LazyClear", level.lazyClearFree },
|
|
{ "LazyClearExt", level.lazyClearFreeExt },
|
|
{ "", 0 },
|
|
{ "ForceUpdate", level.forceUpdate },
|
|
{ "DetachChild", level.detachChild },
|
|
{ "", 0 },
|
|
{ "-BldAvgCount", level.pageBuild ? level.buildItemCount / level.pageBuild : 0 },
|
|
{ "-BldAvgFillPct", level.pageBuild ? level.buildFillPct / level.pageBuild * 100 : 0 },
|
|
{ "-BldAvgStoredPct", level.pageBuild ? level.buildStoredPct / level.pageBuild * 100 : 0 },
|
|
{ "", 0 },
|
|
{ "-ModAvgCount", level.pageModify ? level.modifyItemCount / level.pageModify : 0 },
|
|
{ "-ModAvgFillPct", level.pageModify ? level.modifyFillPct / level.pageModify * 100 : 0 },
|
|
{ "-ModAvgStoredPct", level.pageModify ? level.modifyStoredPct / level.pageModify * 100 : 0 },
|
|
{ "", 0 },
|
|
};
|
|
|
|
if(e != nullptr) {
|
|
for (auto& m : metrics) {
|
|
char c = m.first[0];
|
|
if(c != 0 && (!skipZeroes || m.second != 0) ) {
|
|
e->detail(format("L%d%s", i + 1, m.first + (c == '-' ? 1 : 0)), m.second);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (s != nullptr) {
|
|
*s += format("\nLevel %d\n\t", i + 1);
|
|
|
|
for (auto& m : metrics) {
|
|
const char* name = m.first;
|
|
bool rate = elapsed != 0;
|
|
if (*name == '-') {
|
|
++name;
|
|
rate = false;
|
|
}
|
|
|
|
if (*name == '\0') {
|
|
*s += "\n\t";
|
|
} else if(!skipZeroes || m.second != 0) {
|
|
*s += format("%-15s %8u %8u/s ", name, m.second, rate ? int(m.second / elapsed) : 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string toString(bool clearAfter) {
|
|
std::string s;
|
|
getFields(nullptr, &s);
|
|
|
|
if (clearAfter) {
|
|
clear();
|
|
}
|
|
|
|
return s;
|
|
}
|
|
};
|
|
|
|
// Using a global for Redwood metrics because a single process shouldn't normally have multiple storage engines
|
|
RedwoodMetrics g_redwoodMetrics = {};
|
|
Future<Void> g_redwoodMetricsActor;
|
|
|
|
ACTOR Future<Void> redwoodMetricsLogger() {
|
|
g_redwoodMetrics.clear();
|
|
|
|
loop {
|
|
wait(delay(SERVER_KNOBS->REDWOOD_LOGGING_INTERVAL));
|
|
|
|
TraceEvent e("RedwoodMetrics");
|
|
double elapsed = now() - g_redwoodMetrics.startTime;
|
|
e.detail("Elapsed", elapsed);
|
|
g_redwoodMetrics.getFields(&e);
|
|
g_redwoodMetrics.clear();
|
|
}
|
|
}
|
|
|
|
// Holds an index of recently used objects.
|
|
// ObjectType must have the methods
|
|
// bool evictable() const; // return true if the entry can be evicted
|
|
// Future<Void> onEvictable() const; // ready when entry can be evicted
|
|
template <class IndexType, class ObjectType>
|
|
class ObjectCache : NonCopyable {
|
|
|
|
struct Entry : public boost::intrusive::list_base_hook<> {
|
|
Entry() : hits(0) {}
|
|
IndexType index;
|
|
ObjectType item;
|
|
int hits;
|
|
};
|
|
|
|
typedef std::unordered_map<IndexType, Entry> CacheT;
|
|
typedef boost::intrusive::list<Entry> EvictionOrderT;
|
|
|
|
public:
|
|
ObjectCache(int sizeLimit = 1) : sizeLimit(sizeLimit) {}
|
|
|
|
void setSizeLimit(int n) {
|
|
ASSERT(n > 0);
|
|
sizeLimit = n;
|
|
}
|
|
|
|
// Get the object for i if it exists, else return nullptr.
|
|
// If the object exists, its eviction order will NOT change as this is not a cache hit.
|
|
ObjectType* getIfExists(const IndexType& index) {
|
|
auto i = cache.find(index);
|
|
if (i != cache.end()) {
|
|
++i->second.hits;
|
|
++g_redwoodMetrics.pagerProbeHit;
|
|
return &i->second.item;
|
|
}
|
|
++g_redwoodMetrics.pagerProbeMiss;
|
|
return nullptr;
|
|
}
|
|
|
|
// Get the object for i or create a new one.
|
|
// After a get(), the object for i is the last in evictionOrder.
|
|
// If noHit is set, do not consider this access to be cache hit if the object is present
|
|
// If noMiss is set, do not consider this access to be a cache miss if the object is not present
|
|
ObjectType& get(const IndexType& index, bool noHit = false, bool noMiss = false) {
|
|
Entry& entry = cache[index];
|
|
|
|
// If entry is linked into evictionOrder then move it to the back of the order
|
|
if (entry.is_linked()) {
|
|
if (!noHit) {
|
|
++entry.hits;
|
|
++g_redwoodMetrics.pagerCacheHit;
|
|
|
|
// Move the entry to the back of the eviction order
|
|
evictionOrder.erase(evictionOrder.iterator_to(entry));
|
|
evictionOrder.push_back(entry);
|
|
}
|
|
} else {
|
|
if (!noMiss) {
|
|
++g_redwoodMetrics.pagerCacheMiss;
|
|
}
|
|
// Finish initializing entry
|
|
entry.index = index;
|
|
entry.hits = 0;
|
|
// Insert the newly created Entry at the back of the eviction order
|
|
evictionOrder.push_back(entry);
|
|
|
|
// While the cache is too big, evict the oldest entry until the oldest entry can't be evicted.
|
|
while (cache.size() > sizeLimit) {
|
|
Entry& toEvict = evictionOrder.front();
|
|
|
|
// It's critical that we do not evict the item we just added because it would cause the reference
|
|
// returned to be invalid. An eviction could happen with a no-hit access to a cache resident page
|
|
// that is currently evictable and exists in the oversized portion of the cache eviction order due
|
|
// to previously failed evictions.
|
|
if (&entry == &toEvict) {
|
|
debug_printf("Cannot evict target index %s\n", toString(index).c_str());
|
|
break;
|
|
}
|
|
|
|
debug_printf("Trying to evict %s to make room for %s\n", toString(toEvict.index).c_str(),
|
|
toString(index).c_str());
|
|
|
|
if (!toEvict.item.evictable()) {
|
|
evictionOrder.erase(evictionOrder.iterator_to(toEvict));
|
|
evictionOrder.push_back(toEvict);
|
|
++g_redwoodMetrics.pagerEvictFail;
|
|
break;
|
|
} else {
|
|
if (toEvict.hits == 0) {
|
|
++g_redwoodMetrics.pagerEvictUnhit;
|
|
}
|
|
debug_printf("Evicting %s to make room for %s\n", toString(toEvict.index).c_str(),
|
|
toString(index).c_str());
|
|
evictionOrder.pop_front();
|
|
cache.erase(toEvict.index);
|
|
}
|
|
}
|
|
}
|
|
|
|
return entry.item;
|
|
}
|
|
|
|
// Clears the cache, saving the entries, and then waits for eachWaits for each item to be evictable and evicts it.
|
|
// The cache should not be Evicts all evictable entries
|
|
ACTOR static Future<Void> clear_impl(ObjectCache* self) {
|
|
state ObjectCache::CacheT cache;
|
|
state EvictionOrderT evictionOrder;
|
|
|
|
// Swap cache contents to local state vars
|
|
// After this, no more entries will be added to or read from these
|
|
// structures so we know for sure that no page will become unevictable
|
|
// after it is either evictable or onEvictable() is ready.
|
|
cache.swap(self->cache);
|
|
evictionOrder.swap(self->evictionOrder);
|
|
|
|
state typename EvictionOrderT::iterator i = evictionOrder.begin();
|
|
state typename EvictionOrderT::iterator iEnd = evictionOrder.begin();
|
|
|
|
while (i != iEnd) {
|
|
if (!i->item.evictable()) {
|
|
wait(i->item.onEvictable());
|
|
}
|
|
++i;
|
|
}
|
|
|
|
evictionOrder.clear();
|
|
cache.clear();
|
|
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> clear() {
|
|
ASSERT(evictionOrder.size() == cache.size());
|
|
return clear_impl(this);
|
|
}
|
|
|
|
int count() const { return evictionOrder.size(); }
|
|
|
|
private:
|
|
int64_t sizeLimit;
|
|
|
|
CacheT cache;
|
|
EvictionOrderT evictionOrder;
|
|
};
|
|
|
|
ACTOR template <class T>
|
|
Future<T> forwardError(Future<T> f, Promise<Void> target) {
|
|
try {
|
|
T x = wait(f);
|
|
return x;
|
|
} catch (Error& e) {
|
|
if (e.code() != error_code_actor_cancelled && target.canBeSet()) {
|
|
target.sendError(e);
|
|
}
|
|
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
class DWALPagerSnapshot;
|
|
|
|
// An implementation of IPager2 that supports atomicUpdate() of a page without forcing a change to new page ID.
|
|
// It does this internally mapping the original page ID to alternate page IDs by write version.
|
|
// The page id remaps are kept in memory and also logged to a "remap queue" which must be reloaded on cold start.
|
|
// To prevent the set of remaps from growing unboundedly, once a remap is old enough to be at or before the
|
|
// oldest pager version being maintained the remap can be "undone" by popping it from the remap queue,
|
|
// copying the alternate page ID's data over top of the original page ID's data, and deleting the remap from memory.
|
|
// This process basically describes a "Delayed" Write-Ahead-Log (DWAL) because the remap queue and the newly allocated
|
|
// alternate pages it references basically serve as a write ahead log for pages that will eventially be copied
|
|
// back to their original location once the original version is no longer needed.
|
|
class DWALPager : public IPager2 {
|
|
public:
|
|
typedef FastAllocatedPage Page;
|
|
typedef FIFOQueue<LogicalPageID> LogicalPageQueueT;
|
|
typedef std::map<Version, LogicalPageID> VersionToPageMapT;
|
|
typedef std::unordered_map<LogicalPageID, VersionToPageMapT> PageToVersionedMapT;
|
|
|
|
#pragma pack(push, 1)
|
|
struct DelayedFreePage {
|
|
Version version;
|
|
LogicalPageID pageID;
|
|
|
|
bool operator<(const DelayedFreePage& rhs) const { return version < rhs.version; }
|
|
|
|
std::string toString() const {
|
|
return format("DelayedFreePage{%s @%" PRId64 "}", ::toString(pageID).c_str(), version);
|
|
}
|
|
};
|
|
|
|
struct RemappedPage {
|
|
enum Type { NONE = 'N', REMAP = 'R', FREE = 'F', DETACH = 'D' };
|
|
RemappedPage(Version v = invalidVersion, LogicalPageID o = invalidLogicalPageID, LogicalPageID n = invalidLogicalPageID) : version(v), originalPageID(o), newPageID(n) {}
|
|
|
|
Version version;
|
|
LogicalPageID originalPageID;
|
|
LogicalPageID newPageID;
|
|
|
|
static Type getTypeOf(LogicalPageID newPageID) {
|
|
if(newPageID == invalidLogicalPageID) {
|
|
return FREE;
|
|
}
|
|
if(newPageID == 0) {
|
|
return DETACH;
|
|
}
|
|
return REMAP;
|
|
}
|
|
|
|
Type getType() const {
|
|
return getTypeOf(newPageID);
|
|
}
|
|
|
|
bool operator<(const RemappedPage& rhs) { return version < rhs.version; }
|
|
|
|
std::string toString() const {
|
|
return format("RemappedPage(%c: %s -> %s %s}", getType(), ::toString(originalPageID).c_str(),
|
|
::toString(newPageID).c_str(), ::toString(version).c_str());
|
|
}
|
|
};
|
|
|
|
#pragma pack(pop)
|
|
|
|
typedef FIFOQueue<DelayedFreePage> DelayedFreePageQueueT;
|
|
typedef FIFOQueue<RemappedPage> RemapQueueT;
|
|
|
|
// If the file already exists, pageSize might be different than desiredPageSize
|
|
// Use pageCacheSizeBytes == 0 to use default from flow knobs
|
|
// If filename is empty, the pager will exist only in memory and once the cache is full writes will fail.
|
|
DWALPager(int desiredPageSize, std::string filename, int64_t pageCacheSizeBytes, Version remapCleanupWindow, bool memoryOnly = false)
|
|
: desiredPageSize(desiredPageSize), filename(filename), pHeader(nullptr), pageCacheBytes(pageCacheSizeBytes),
|
|
memoryOnly(memoryOnly), remapCleanupWindow(remapCleanupWindow) {
|
|
|
|
if (!g_redwoodMetricsActor.isValid()) {
|
|
g_redwoodMetricsActor = redwoodMetricsLogger();
|
|
}
|
|
|
|
commitFuture = Void();
|
|
recoverFuture = forwardError(recover(this), errorPromise);
|
|
}
|
|
|
|
void setPageSize(int size) {
|
|
logicalPageSize = size;
|
|
// Physical page size is the total size of the smallest number of physical blocks needed to store
|
|
// logicalPageSize bytes
|
|
int blocks = 1 + ((logicalPageSize - 1) / smallestPhysicalBlock);
|
|
physicalPageSize = blocks * smallestPhysicalBlock;
|
|
if (pHeader != nullptr) {
|
|
pHeader->pageSize = logicalPageSize;
|
|
}
|
|
pageCache.setSizeLimit(1 + ((pageCacheBytes - 1) / physicalPageSize));
|
|
}
|
|
|
|
void updateCommittedHeader() {
|
|
memcpy(lastCommittedHeaderPage->mutate(), headerPage->begin(), smallestPhysicalBlock);
|
|
}
|
|
|
|
ACTOR static Future<Void> recover(DWALPager* self) {
|
|
ASSERT(!self->recoverFuture.isValid());
|
|
|
|
state bool exists = false;
|
|
|
|
if (!self->memoryOnly) {
|
|
int64_t flags = IAsyncFile::OPEN_UNCACHED | IAsyncFile::OPEN_UNBUFFERED | IAsyncFile::OPEN_READWRITE |
|
|
IAsyncFile::OPEN_LOCK;
|
|
exists = fileExists(self->filename);
|
|
if (!exists) {
|
|
flags |= IAsyncFile::OPEN_ATOMIC_WRITE_AND_CREATE | IAsyncFile::OPEN_CREATE;
|
|
}
|
|
|
|
wait(store(self->pageFile, IAsyncFileSystem::filesystem()->open(self->filename, flags, 0644)));
|
|
}
|
|
|
|
// Header page is always treated as having a page size of smallestPhysicalBlock
|
|
self->setPageSize(smallestPhysicalBlock);
|
|
self->lastCommittedHeaderPage = self->newPageBuffer();
|
|
self->pLastCommittedHeader = (Header*)self->lastCommittedHeaderPage->begin();
|
|
|
|
state int64_t fileSize = 0;
|
|
if (exists) {
|
|
wait(store(fileSize, self->pageFile->size()));
|
|
}
|
|
|
|
debug_printf("DWALPager(%s) recover exists=%d fileSize=%" PRId64 "\n", self->filename.c_str(), exists,
|
|
fileSize);
|
|
// TODO: If the file exists but appears to never have been successfully committed is this an error or
|
|
// should recovery proceed with a new pager instance?
|
|
|
|
// If there are at least 2 pages then try to recover the existing file
|
|
if (exists && fileSize >= (self->smallestPhysicalBlock * 2)) {
|
|
debug_printf("DWALPager(%s) recovering using existing file\n", self->filename.c_str());
|
|
|
|
state bool recoveredHeader = false;
|
|
|
|
// Read physical page 0 directly
|
|
wait(store(self->headerPage, self->readHeaderPage(self, 0)));
|
|
|
|
// If the checksum fails for the header page, try to recover committed header backup from page 1
|
|
if (!self->headerPage.castTo<Page>()->verifyChecksum(0)) {
|
|
TraceEvent(SevWarn, "DWALPagerRecoveringHeader").detail("Filename", self->filename);
|
|
|
|
wait(store(self->headerPage, self->readHeaderPage(self, 1)));
|
|
|
|
if (!self->headerPage.castTo<Page>()->verifyChecksum(1)) {
|
|
if (g_network->isSimulated()) {
|
|
// TODO: Detect if process is being restarted and only throw injected if so?
|
|
throw io_error().asInjectedFault();
|
|
}
|
|
|
|
Error e = checksum_failed();
|
|
TraceEvent(SevError, "DWALPagerRecoveryFailed").detail("Filename", self->filename).error(e);
|
|
throw e;
|
|
}
|
|
recoveredHeader = true;
|
|
}
|
|
|
|
self->pHeader = (Header*)self->headerPage->begin();
|
|
|
|
if (self->pHeader->formatVersion != Header::FORMAT_VERSION) {
|
|
Error e = internal_error(); // TODO: Something better?
|
|
TraceEvent(SevError, "DWALPagerRecoveryFailedWrongVersion")
|
|
.detail("Filename", self->filename)
|
|
.detail("Version", self->pHeader->formatVersion)
|
|
.detail("ExpectedVersion", Header::FORMAT_VERSION)
|
|
.error(e);
|
|
throw e;
|
|
}
|
|
|
|
self->setPageSize(self->pHeader->pageSize);
|
|
if (self->logicalPageSize != self->desiredPageSize) {
|
|
TraceEvent(SevWarn, "DWALPagerPageSizeNotDesired")
|
|
.detail("Filename", self->filename)
|
|
.detail("ExistingPageSize", self->logicalPageSize)
|
|
.detail("DesiredPageSize", self->desiredPageSize);
|
|
}
|
|
|
|
self->freeList.recover(self, self->pHeader->freeList, "FreeListRecovered");
|
|
self->delayedFreeList.recover(self, self->pHeader->delayedFreeList, "DelayedFreeListRecovered");
|
|
self->remapQueue.recover(self, self->pHeader->remapQueue, "RemapQueueRecovered");
|
|
|
|
Standalone<VectorRef<RemappedPage>> remaps = wait(self->remapQueue.peekAll());
|
|
for (auto& r : remaps) {
|
|
self->remappedPages[r.originalPageID][r.version] = r.newPageID;
|
|
}
|
|
|
|
// If the header was recovered from the backup at Page 1 then write and sync it to Page 0 before continuing.
|
|
// If this fails, the backup header is still in tact for the next recovery attempt.
|
|
if (recoveredHeader) {
|
|
// Write the header to page 0
|
|
wait(self->writeHeaderPage(0, self->headerPage));
|
|
|
|
// Wait for all outstanding writes to complete
|
|
wait(self->operations.signalAndCollapse());
|
|
|
|
// Sync header
|
|
wait(self->pageFile->sync());
|
|
debug_printf("DWALPager(%s) Header recovery complete.\n", self->filename.c_str());
|
|
}
|
|
|
|
// Update the last committed header with the one that was recovered (which is the last known committed
|
|
// header)
|
|
self->updateCommittedHeader();
|
|
self->addLatestSnapshot();
|
|
self->remapCleanupFuture = remapCleanup(self);
|
|
} else {
|
|
// Note: If the file contains less than 2 pages but more than 0 bytes then the pager was never successfully
|
|
// committed. A new pager will be created in its place.
|
|
// TODO: Is the right behavior?
|
|
|
|
debug_printf("DWALPager(%s) creating new pager\n", self->filename.c_str());
|
|
|
|
self->headerPage = self->newPageBuffer();
|
|
self->pHeader = (Header*)self->headerPage->begin();
|
|
|
|
// Now that the header page has been allocated, set page size to desired
|
|
self->setPageSize(self->desiredPageSize);
|
|
|
|
// Write new header using desiredPageSize
|
|
self->pHeader->formatVersion = Header::FORMAT_VERSION;
|
|
self->pHeader->committedVersion = 1;
|
|
self->pHeader->oldestVersion = 1;
|
|
// No meta key until a user sets one and commits
|
|
self->pHeader->setMetaKey(Key());
|
|
|
|
// There are 2 reserved pages:
|
|
// Page 0 - header
|
|
// Page 1 - header backup
|
|
self->pHeader->pageCount = 2;
|
|
|
|
// Create queues
|
|
self->freeList.create(self, self->newLastPageID(), "FreeList");
|
|
self->delayedFreeList.create(self, self->newLastPageID(), "delayedFreeList");
|
|
self->remapQueue.create(self, self->newLastPageID(), "remapQueue");
|
|
|
|
// The first commit() below will flush the queues and update the queue states in the header,
|
|
// but since the queues will not be used between now and then their states will not change.
|
|
// In order to populate lastCommittedHeader, update the header now with the queue states.
|
|
self->pHeader->freeList = self->freeList.getState();
|
|
self->pHeader->delayedFreeList = self->delayedFreeList.getState();
|
|
self->pHeader->remapQueue = self->remapQueue.getState();
|
|
|
|
// Set remaining header bytes to \xff
|
|
memset(self->headerPage->mutate() + self->pHeader->size(), 0xff,
|
|
self->headerPage->size() - self->pHeader->size());
|
|
|
|
// Since there is no previously committed header use the initial header for the initial commit.
|
|
self->updateCommittedHeader();
|
|
|
|
self->remapCleanupFuture = Void();
|
|
wait(self->commit());
|
|
}
|
|
|
|
debug_printf("DWALPager(%s) recovered. committedVersion=%" PRId64 " logicalPageSize=%d physicalPageSize=%d\n",
|
|
self->filename.c_str(), self->pHeader->committedVersion, self->logicalPageSize,
|
|
self->physicalPageSize);
|
|
return Void();
|
|
}
|
|
|
|
Reference<IPage> newPageBuffer() override {
|
|
return Reference<IPage>(new FastAllocatedPage(logicalPageSize, physicalPageSize));
|
|
}
|
|
|
|
// Returns the usable size of pages returned by the pager (i.e. the size of the page that isn't pager overhead).
|
|
// For a given pager instance, separate calls to this function must return the same value.
|
|
int getUsablePageSize() const override { return logicalPageSize - sizeof(FastAllocatedPage::Checksum); }
|
|
|
|
// Get a new, previously available page ID. The page will be considered in-use after the next commit
|
|
// regardless of whether or not it was written to, until it is returned to the pager via freePage()
|
|
ACTOR static Future<LogicalPageID> newPageID_impl(DWALPager* self) {
|
|
// First try the free list
|
|
Optional<LogicalPageID> freePageID = wait(self->freeList.pop());
|
|
if (freePageID.present()) {
|
|
debug_printf("DWALPager(%s) newPageID() returning %s from free list\n", self->filename.c_str(),
|
|
toString(freePageID.get()).c_str());
|
|
return freePageID.get();
|
|
}
|
|
|
|
// Try to reuse pages up to the earlier of the oldest version set by the user or the oldest snapshot still in
|
|
// the snapshots list
|
|
ASSERT(!self->snapshots.empty());
|
|
Optional<DelayedFreePage> delayedFreePageID =
|
|
wait(self->delayedFreeList.pop(DelayedFreePage{ self->effectiveOldestVersion(), 0 }));
|
|
if (delayedFreePageID.present()) {
|
|
debug_printf("DWALPager(%s) newPageID() returning %s from delayed free list\n", self->filename.c_str(),
|
|
toString(delayedFreePageID.get()).c_str());
|
|
return delayedFreePageID.get().pageID;
|
|
}
|
|
|
|
// Lastly, add a new page to the pager
|
|
LogicalPageID id = self->newLastPageID();
|
|
debug_printf("DWALPager(%s) newPageID() returning %s at end of file\n", self->filename.c_str(),
|
|
toString(id).c_str());
|
|
return id;
|
|
};
|
|
|
|
// Grow the pager file by pone page and return it
|
|
LogicalPageID newLastPageID() {
|
|
LogicalPageID id = pHeader->pageCount;
|
|
++pHeader->pageCount;
|
|
return id;
|
|
}
|
|
|
|
Future<LogicalPageID> newPageID() override { return newPageID_impl(this); }
|
|
|
|
Future<Void> writePhysicalPage(PhysicalPageID pageID, Reference<IPage> page, bool header = false) {
|
|
debug_printf("DWALPager(%s) op=%s %s ptr=%p\n", filename.c_str(),
|
|
(header ? "writePhysicalHeader" : "writePhysical"), toString(pageID).c_str(), page->begin());
|
|
|
|
++g_redwoodMetrics.pagerDiskWrite;
|
|
VALGRIND_MAKE_MEM_DEFINED(page->begin(), page->size());
|
|
((Page*)page.getPtr())->updateChecksum(pageID);
|
|
|
|
if (memoryOnly) {
|
|
return Void();
|
|
}
|
|
|
|
// Note: Not using forwardError here so a write error won't be discovered until commit time.
|
|
int blockSize = header ? smallestPhysicalBlock : physicalPageSize;
|
|
Future<Void> f =
|
|
holdWhile(page, map(pageFile->write(page->begin(), blockSize, (int64_t)pageID * blockSize), [=](Void) {
|
|
debug_printf("DWALPager(%s) op=%s %s ptr=%p\n", filename.c_str(),
|
|
(header ? "writePhysicalHeaderComplete" : "writePhysicalComplete"),
|
|
toString(pageID).c_str(), page->begin());
|
|
return Void();
|
|
}));
|
|
operations.add(f);
|
|
return f;
|
|
}
|
|
|
|
Future<Void> writeHeaderPage(PhysicalPageID pageID, Reference<IPage> page) {
|
|
return writePhysicalPage(pageID, page, true);
|
|
}
|
|
|
|
void updatePage(LogicalPageID pageID, Reference<IPage> data) override {
|
|
// Get the cache entry for this page, without counting it as a cache hit as we're replacing its contents now
|
|
// or as a cache miss because there is no benefit to the page already being in cache
|
|
PageCacheEntry& cacheEntry = pageCache.get(pageID, true, true);
|
|
debug_printf("DWALPager(%s) op=write %s cached=%d reading=%d writing=%d\n", filename.c_str(),
|
|
toString(pageID).c_str(), cacheEntry.initialized(),
|
|
cacheEntry.initialized() && cacheEntry.reading(),
|
|
cacheEntry.initialized() && cacheEntry.writing());
|
|
|
|
// If the page is still being read then it's not also being written because a write places
|
|
// the new content into readFuture when the write is launched, not when it is completed.
|
|
// Read/write ordering is being enforced waiting readers will not see the new write. This
|
|
// is necessary for remap erasure to work correctly since the oldest version of a page, located
|
|
// at the original page ID, could have a pending read when that version is expired and the write
|
|
// of the next newest version over top of the original page begins.
|
|
if (!cacheEntry.initialized()) {
|
|
cacheEntry.writeFuture = writePhysicalPage(pageID, data);
|
|
} else if (cacheEntry.reading()) {
|
|
// Wait for the read to finish, then start the write.
|
|
cacheEntry.writeFuture = map(success(cacheEntry.readFuture), [=](Void) {
|
|
writePhysicalPage(pageID, data);
|
|
return Void();
|
|
});
|
|
}
|
|
// If the page is being written, wait for this write before issuing the new write to ensure the
|
|
// writes happen in the correct order
|
|
else if (cacheEntry.writing()) {
|
|
cacheEntry.writeFuture = map(cacheEntry.writeFuture, [=](Void) {
|
|
writePhysicalPage(pageID, data);
|
|
return Void();
|
|
});
|
|
} else {
|
|
cacheEntry.writeFuture = writePhysicalPage(pageID, data);
|
|
}
|
|
|
|
// Always update the page contents immediately regardless of what happened above.
|
|
cacheEntry.readFuture = data;
|
|
}
|
|
|
|
Future<LogicalPageID> atomicUpdatePage(LogicalPageID pageID, Reference<IPage> data, Version v) override {
|
|
debug_printf("DWALPager(%s) op=writeAtomic %s @%" PRId64 "\n", filename.c_str(), toString(pageID).c_str(), v);
|
|
Future<LogicalPageID> f = map(newPageID(), [=](LogicalPageID newPageID) {
|
|
updatePage(newPageID, data);
|
|
// TODO: Possibly limit size of remap queue since it must be recovered on cold start
|
|
RemappedPage r{ v, pageID, newPageID };
|
|
remapQueue.pushBack(r);
|
|
remappedPages[pageID][v] = newPageID;
|
|
debug_printf("DWALPager(%s) pushed %s\n", filename.c_str(), RemappedPage(r).toString().c_str());
|
|
return pageID;
|
|
});
|
|
|
|
// No need for forwardError here because newPageID() is already wrapped in forwardError
|
|
return f;
|
|
}
|
|
|
|
void freeUnmappedPage(LogicalPageID pageID, Version v) {
|
|
// If v is older than the oldest version still readable then mark pageID as free as of the next commit
|
|
if (v < effectiveOldestVersion()) {
|
|
debug_printf("DWALPager(%s) op=freeNow %s @%" PRId64 " oldestVersion=%" PRId64 "\n", filename.c_str(),
|
|
toString(pageID).c_str(), v, pLastCommittedHeader->oldestVersion);
|
|
freeList.pushBack(pageID);
|
|
} else {
|
|
// Otherwise add it to the delayed free list
|
|
debug_printf("DWALPager(%s) op=freeLater %s @%" PRId64 " oldestVersion=%" PRId64 "\n", filename.c_str(),
|
|
toString(pageID).c_str(), v, pLastCommittedHeader->oldestVersion);
|
|
delayedFreeList.pushBack({ v, pageID });
|
|
}
|
|
}
|
|
|
|
LogicalPageID detachRemappedPage(LogicalPageID pageID, Version v) override {
|
|
auto i = remappedPages.find(pageID);
|
|
if(i == remappedPages.end()) {
|
|
// Page is not remapped
|
|
return invalidLogicalPageID;
|
|
}
|
|
|
|
// Get the page that id was most recently remapped to
|
|
auto iLast = i->second.rbegin();
|
|
LogicalPageID newID = iLast->second;
|
|
ASSERT(RemappedPage::getTypeOf(newID) == RemappedPage::REMAP);
|
|
|
|
// If the last change remap was also at v then change the remap to a delete, as it's essentially
|
|
// the same as the original page being deleted at that version and newID being used from then on.
|
|
if(iLast->first == v) {
|
|
debug_printf("DWALPager(%s) op=detachDelete originalID=%s newID=%s @%" PRId64 " oldestVersion=%" PRId64 "\n", filename.c_str(),
|
|
toString(pageID).c_str(), toString(newID).c_str(), v, pLastCommittedHeader->oldestVersion);
|
|
iLast->second = invalidLogicalPageID;
|
|
remapQueue.pushBack(RemappedPage{ v, pageID, invalidLogicalPageID });
|
|
} else {
|
|
debug_printf("DWALPager(%s) op=detach originalID=%s newID=%s @%" PRId64 " oldestVersion=%" PRId64 "\n", filename.c_str(),
|
|
toString(pageID).c_str(), toString(newID).c_str(), v, pLastCommittedHeader->oldestVersion);
|
|
// Mark id as converted to its last remapped location as of v
|
|
i->second[v] = 0;
|
|
remapQueue.pushBack(RemappedPage{ v, pageID, 0 });
|
|
}
|
|
return newID;
|
|
}
|
|
|
|
void freePage(LogicalPageID pageID, Version v) override {
|
|
// If pageID has been remapped, then it can't be freed until all existing remaps for that page have been undone,
|
|
// so queue it for later deletion
|
|
auto i = remappedPages.find(pageID);
|
|
if (i != remappedPages.end()) {
|
|
debug_printf("DWALPager(%s) op=freeRemapped %s @%" PRId64 " oldestVersion=%" PRId64 "\n", filename.c_str(),
|
|
toString(pageID).c_str(), v, pLastCommittedHeader->oldestVersion);
|
|
remapQueue.pushBack(RemappedPage{ v, pageID, invalidLogicalPageID });
|
|
i->second[v] = invalidLogicalPageID;
|
|
return;
|
|
}
|
|
|
|
freeUnmappedPage(pageID, v);
|
|
};
|
|
|
|
// Read a physical page from the page file. Note that header pages use a page size of smallestPhysicalBlock
|
|
// If the user chosen physical page size is larger, then there will be a gap of unused space after the header pages
|
|
// and before the user-chosen sized pages.
|
|
ACTOR static Future<Reference<IPage>> readPhysicalPage(DWALPager* self, PhysicalPageID pageID,
|
|
bool header = false) {
|
|
ASSERT(!self->memoryOnly);
|
|
++g_redwoodMetrics.pagerDiskRead;
|
|
|
|
if (g_network->getCurrentTask() > TaskPriority::DiskRead) {
|
|
wait(delay(0, TaskPriority::DiskRead));
|
|
}
|
|
|
|
state Reference<IPage> page =
|
|
header ? Reference<IPage>(new FastAllocatedPage(smallestPhysicalBlock, smallestPhysicalBlock))
|
|
: self->newPageBuffer();
|
|
debug_printf("DWALPager(%s) op=readPhysicalStart %s ptr=%p\n", self->filename.c_str(), toString(pageID).c_str(),
|
|
page->begin());
|
|
|
|
int blockSize = header ? smallestPhysicalBlock : self->physicalPageSize;
|
|
// TODO: Could a dispatched read try to write to page after it has been destroyed if this actor is cancelled?
|
|
int readBytes = wait(self->pageFile->read(page->mutate(), blockSize, (int64_t)pageID * blockSize));
|
|
debug_printf("DWALPager(%s) op=readPhysicalComplete %s ptr=%p bytes=%d\n", self->filename.c_str(),
|
|
toString(pageID).c_str(), page->begin(), readBytes);
|
|
|
|
// Header reads are checked explicitly during recovery
|
|
if (!header) {
|
|
Page* p = (Page*)page.getPtr();
|
|
if (!p->verifyChecksum(pageID)) {
|
|
debug_printf("DWALPager(%s) checksum failed for %s\n", self->filename.c_str(),
|
|
toString(pageID).c_str());
|
|
Error e = checksum_failed();
|
|
TraceEvent(SevError, "DWALPagerChecksumFailed")
|
|
.detail("Filename", self->filename.c_str())
|
|
.detail("PageID", pageID)
|
|
.detail("PageSize", self->physicalPageSize)
|
|
.detail("Offset", pageID * self->physicalPageSize)
|
|
.detail("CalculatedChecksum", p->calculateChecksum(pageID))
|
|
.detail("ChecksumInPage", p->getChecksum())
|
|
.error(e);
|
|
throw e;
|
|
}
|
|
}
|
|
return page;
|
|
}
|
|
|
|
static Future<Reference<IPage>> readHeaderPage(DWALPager* self, PhysicalPageID pageID) {
|
|
return readPhysicalPage(self, pageID, true);
|
|
}
|
|
|
|
// Reads the most recent version of pageID, either previously committed or written using updatePage() in the current
|
|
// commit
|
|
Future<Reference<IPage>> readPage(LogicalPageID pageID, bool cacheable, bool noHit = false) override {
|
|
// Use cached page if present, without triggering a cache hit.
|
|
// Otherwise, read the page and return it but don't add it to the cache
|
|
if (!cacheable) {
|
|
debug_printf("DWALPager(%s) op=readUncached %s\n", filename.c_str(), toString(pageID).c_str());
|
|
PageCacheEntry* pCacheEntry = pageCache.getIfExists(pageID);
|
|
if (pCacheEntry != nullptr) {
|
|
debug_printf("DWALPager(%s) op=readUncachedHit %s\n", filename.c_str(), toString(pageID).c_str());
|
|
return pCacheEntry->readFuture;
|
|
}
|
|
|
|
debug_printf("DWALPager(%s) op=readUncachedMiss %s\n", filename.c_str(), toString(pageID).c_str());
|
|
return forwardError(readPhysicalPage(this, (PhysicalPageID)pageID), errorPromise);
|
|
}
|
|
|
|
PageCacheEntry& cacheEntry = pageCache.get(pageID, noHit);
|
|
debug_printf("DWALPager(%s) op=read %s cached=%d reading=%d writing=%d noHit=%d\n", filename.c_str(),
|
|
toString(pageID).c_str(), cacheEntry.initialized(),
|
|
cacheEntry.initialized() && cacheEntry.reading(), cacheEntry.initialized() && cacheEntry.writing(),
|
|
noHit);
|
|
|
|
if (!cacheEntry.initialized()) {
|
|
debug_printf("DWALPager(%s) issuing actual read of %s\n", filename.c_str(), toString(pageID).c_str());
|
|
cacheEntry.readFuture = readPhysicalPage(this, (PhysicalPageID)pageID);
|
|
cacheEntry.writeFuture = Void();
|
|
}
|
|
|
|
cacheEntry.readFuture = forwardError(cacheEntry.readFuture, errorPromise);
|
|
return cacheEntry.readFuture;
|
|
}
|
|
|
|
Future<Reference<IPage>> readPageAtVersion(LogicalPageID pageID, Version v, bool cacheable, bool noHit) {
|
|
auto i = remappedPages.find(pageID);
|
|
|
|
if (i != remappedPages.end()) {
|
|
auto j = i->second.upper_bound(v);
|
|
if (j != i->second.begin()) {
|
|
--j;
|
|
debug_printf("DWALPager(%s) op=readAtVersionRemapped %s @%" PRId64 " -> %s\n", filename.c_str(), toString(pageID).c_str(),
|
|
v, toString(j->second).c_str());
|
|
pageID = j->second;
|
|
ASSERT(pageID != invalidLogicalPageID);
|
|
}
|
|
} else {
|
|
debug_printf("DWALPager(%s) op=readAtVersionNotRemapped %s @%" PRId64 " (not remapped)\n", filename.c_str(),
|
|
toString(pageID).c_str(), v);
|
|
}
|
|
|
|
return readPage(pageID, cacheable, noHit);
|
|
}
|
|
|
|
// Get snapshot as of the most recent committed version of the pager
|
|
Reference<IPagerSnapshot> getReadSnapshot(Version v) override;
|
|
void addLatestSnapshot();
|
|
|
|
// Set the pending oldest versiont to keep as of the next commit
|
|
void setOldestVersion(Version v) override {
|
|
ASSERT(v >= pHeader->oldestVersion);
|
|
ASSERT(v <= pHeader->committedVersion);
|
|
pHeader->oldestVersion = v;
|
|
expireSnapshots(v);
|
|
};
|
|
|
|
// Get the oldest *readable* version, which is not the same as the oldest retained version as the version
|
|
// returned could have been set as the oldest version in the pending commit
|
|
Version getOldestVersion() const override { return pHeader->oldestVersion; };
|
|
|
|
// Calculate the *effective* oldest version, which can be older than the one set in the last commit since we
|
|
// are allowing active snapshots to temporarily delay page reuse.
|
|
Version effectiveOldestVersion() {
|
|
return std::min(pLastCommittedHeader->oldestVersion, snapshots.front().version);
|
|
}
|
|
|
|
ACTOR static Future<Void> removeRemapEntry(DWALPager* self, RemappedPage p, Version oldestRetainedVersion) {
|
|
// Get iterator to the versioned page map entry for the original page
|
|
state PageToVersionedMapT::iterator iPageMapPair = self->remappedPages.find(p.originalPageID);
|
|
// The iterator must be valid and not empty and its first page map entry must match p's version
|
|
ASSERT(iPageMapPair != self->remappedPages.end());
|
|
ASSERT(!iPageMapPair->second.empty());
|
|
state VersionToPageMapT::iterator iVersionPagePair = iPageMapPair->second.find(p.version);
|
|
ASSERT(iVersionPagePair != iPageMapPair->second.end());
|
|
|
|
RemappedPage::Type firstType = p.getType();
|
|
state RemappedPage::Type secondType;
|
|
bool secondAfterOldestRetainedVersion = false;
|
|
state bool deleteAtSameVersion = false;
|
|
if(p.newPageID == iVersionPagePair->second) {
|
|
auto nextEntry = iVersionPagePair;
|
|
++nextEntry;
|
|
if(nextEntry == iPageMapPair->second.end()) {
|
|
secondType = RemappedPage::NONE;
|
|
} else {
|
|
secondType = RemappedPage::getTypeOf(nextEntry->second);
|
|
secondAfterOldestRetainedVersion = nextEntry->first >= oldestRetainedVersion;
|
|
}
|
|
} else {
|
|
ASSERT(iVersionPagePair->second == invalidLogicalPageID);
|
|
secondType = RemappedPage::FREE;
|
|
deleteAtSameVersion = true;
|
|
}
|
|
ASSERT(firstType == RemappedPage::REMAP || secondType == RemappedPage::NONE);
|
|
|
|
// Scenarios and actions to take:
|
|
//
|
|
// The first letter (firstType) is the type of the entry just popped from the remap queue.
|
|
// The second letter (secondType) is the type of the next item in the queue for the same
|
|
// original page ID, if present. If not present, secondType will be NONE.
|
|
//
|
|
// Since the next item can be arbitrarily ahead in the queue, secondType is determined by
|
|
// looking at the remappedPages structure.
|
|
//
|
|
// R == Remap F == Free D == Detach | == oldestRetaineedVersion
|
|
//
|
|
// R R | free new ID
|
|
// R F | free new ID if R and D are at different versions
|
|
// R D | do nothing
|
|
// R | R copy new to original ID, free new ID
|
|
// R | F copy new to original ID, free new ID
|
|
// R | D copy new to original ID
|
|
// R | copy new to original ID, free new ID
|
|
// F | free original ID
|
|
// D | free original ID
|
|
//
|
|
// Note that
|
|
//
|
|
// Special case: Page is detached while it is being read in remapCopyAndFree()
|
|
// Initial state: R |
|
|
// Start remapCopyAndFree(), intending to copy new, ID to originalID and free newID
|
|
// New state: R | D
|
|
// Read of newID completes.
|
|
// Copy new contents over original, do NOT free new ID
|
|
// Later popped state: D |
|
|
// free original ID
|
|
//
|
|
state bool freeNewID = (firstType == RemappedPage::REMAP && secondType != RemappedPage::DETACH && !deleteAtSameVersion);
|
|
state bool copyNewToOriginal = (firstType == RemappedPage::REMAP && (secondAfterOldestRetainedVersion || secondType == RemappedPage::NONE));
|
|
state bool freeOriginalID = (firstType == RemappedPage::FREE || firstType == RemappedPage::DETACH);
|
|
|
|
debug_printf("DWALPager(%s) remapCleanup %s secondType=%c mapEntry=%s oldestRetainedVersion=%" PRId64 " \n",
|
|
self->filename.c_str(), p.toString().c_str(), secondType, ::toString(*iVersionPagePair).c_str(), oldestRetainedVersion);
|
|
|
|
if(copyNewToOriginal) {
|
|
debug_printf("DWALPager(%s) remapCleanup copy %s\n", self->filename.c_str(), p.toString().c_str());
|
|
|
|
// Read the data from the page that the original was mapped to
|
|
Reference<IPage> data = wait(self->readPage(p.newPageID, false, true));
|
|
|
|
// Write the data to the original page so it can be read using its original pageID
|
|
self->updatePage(p.originalPageID, data);
|
|
++g_redwoodMetrics.pagerRemapCopy;
|
|
} else if (firstType == RemappedPage::REMAP) {
|
|
++g_redwoodMetrics.pagerRemapSkip;
|
|
}
|
|
|
|
// Now that the page contents have been copied to the original page, if the corresponding map entry
|
|
// represented the remap and there wasn't a delete later in the queue at p for the same version then
|
|
// erase the entry.
|
|
if(!deleteAtSameVersion) {
|
|
debug_printf("DWALPager(%s) remapCleanup deleting map entry %s\n", self->filename.c_str(), p.toString().c_str());
|
|
// Erase the entry and set iVersionPagePair to the next entry or end
|
|
iVersionPagePair = iPageMapPair->second.erase(iVersionPagePair);
|
|
|
|
// If the map is now empty, delete it
|
|
if(iPageMapPair->second.empty()) {
|
|
debug_printf("DWALPager(%s) remapCleanup deleting empty map %s\n", self->filename.c_str(), p.toString().c_str());
|
|
self->remappedPages.erase(iPageMapPair);
|
|
} else if(freeNewID && secondType == RemappedPage::NONE && iVersionPagePair != iPageMapPair->second.end() && RemappedPage::getTypeOf(iVersionPagePair->second) == RemappedPage::DETACH) {
|
|
// If we intend to free the new ID and there was no map entry, one could have been added during the wait above.
|
|
// If so, and if it was a detach operation, then we can't free the new page ID as its lifetime will be managed
|
|
// by the client starting at some later version.
|
|
freeNewID = false;
|
|
}
|
|
}
|
|
|
|
if(freeNewID) {
|
|
debug_printf("DWALPager(%s) remapCleanup freeNew %s\n", self->filename.c_str(), p.toString().c_str());
|
|
self->freeUnmappedPage(p.newPageID, 0);
|
|
++g_redwoodMetrics.pagerRemapFree;
|
|
}
|
|
|
|
if(freeOriginalID) {
|
|
debug_printf("DWALPager(%s) remapCleanup freeOriginal %s\n", self->filename.c_str(), p.toString().c_str());
|
|
self->freeUnmappedPage(p.originalPageID, 0);
|
|
++g_redwoodMetrics.pagerRemapFree;
|
|
}
|
|
|
|
return Void();
|
|
}
|
|
|
|
ACTOR static Future<Void> remapCleanup(DWALPager* self) {
|
|
state ActorCollection tasks(true);
|
|
state Promise<Void> signal;
|
|
tasks.add(signal.getFuture());
|
|
|
|
self->remapCleanupStop = false;
|
|
|
|
// The oldest retained version cannot change during the cleanup run as this would allow multiple read/copy
|
|
// operations with the same original page ID destination to be started and they could complete out of order.
|
|
state Version oldestRetainedVersion = self->effectiveOldestVersion();
|
|
|
|
// Cutoff is the version we can pop to
|
|
state RemappedPage cutoff(oldestRetainedVersion - self->remapCleanupWindow);
|
|
|
|
// Minimum version we must pop to before obeying stop command.
|
|
state Version minStopVersion = cutoff.version - (self->remapCleanupWindow * SERVER_KNOBS->REDWOOD_REMAP_CLEANUP_LAG);
|
|
|
|
loop {
|
|
state Optional<RemappedPage> p = wait(self->remapQueue.pop(cutoff));
|
|
debug_printf("DWALPager(%s) remapCleanup popped %s\n", self->filename.c_str(), ::toString(p).c_str());
|
|
|
|
// Stop if we have reached the cutoff version, which is the start of the cleanup coalescing window
|
|
if (!p.present()) {
|
|
break;
|
|
}
|
|
|
|
Future<Void> task = removeRemapEntry(self, p.get(), oldestRetainedVersion);
|
|
if(!task.isReady()) {
|
|
tasks.add(task);
|
|
}
|
|
|
|
// If the stop flag is set and we've reached the minimum stop version according the the allowed lag then stop.
|
|
if (self->remapCleanupStop && p.get().version >= minStopVersion) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
debug_printf("DWALPager(%s) remapCleanup stopped (stop=%d)\n", self->filename.c_str(), self->remapCleanupStop);
|
|
signal.send(Void());
|
|
wait(tasks.getResult());
|
|
return Void();
|
|
}
|
|
|
|
// Flush all queues so they have no operations pending.
|
|
ACTOR static Future<Void> flushQueues(DWALPager* self) {
|
|
ASSERT(self->remapCleanupFuture.isReady());
|
|
|
|
// Flush remap queue separately, it's not involved in free page management
|
|
wait(self->remapQueue.flush());
|
|
|
|
// Flush the free list and delayed free list queues together as they are used by freePage() and newPageID()
|
|
loop {
|
|
state bool freeBusy = wait(self->freeList.preFlush());
|
|
state bool delayedFreeBusy = wait(self->delayedFreeList.preFlush());
|
|
|
|
// Once preFlush() returns false for both queues then there are no more operations pending
|
|
// on either queue. If preFlush() returns true for either queue in one loop execution then
|
|
// it could have generated new work for itself or the other queue.
|
|
if (!freeBusy && !delayedFreeBusy) {
|
|
break;
|
|
}
|
|
}
|
|
self->freeList.finishFlush();
|
|
self->delayedFreeList.finishFlush();
|
|
|
|
return Void();
|
|
}
|
|
|
|
ACTOR static Future<Void> commit_impl(DWALPager* self) {
|
|
debug_printf("DWALPager(%s) commit begin\n", self->filename.c_str());
|
|
|
|
// Write old committed header to Page 1
|
|
self->writeHeaderPage(1, self->lastCommittedHeaderPage);
|
|
|
|
// Trigger the remap eraser to stop and then wait for it.
|
|
self->remapCleanupStop = true;
|
|
wait(self->remapCleanupFuture);
|
|
|
|
wait(flushQueues(self));
|
|
|
|
self->pHeader->remapQueue = self->remapQueue.getState();
|
|
self->pHeader->freeList = self->freeList.getState();
|
|
self->pHeader->delayedFreeList = self->delayedFreeList.getState();
|
|
|
|
// Wait for all outstanding writes to complete
|
|
debug_printf("DWALPager(%s) waiting for outstanding writes\n", self->filename.c_str());
|
|
wait(self->operations.signalAndCollapse());
|
|
debug_printf("DWALPager(%s) Syncing\n", self->filename.c_str());
|
|
|
|
// Sync everything except the header
|
|
if (g_network->getCurrentTask() > TaskPriority::DiskWrite) {
|
|
wait(delay(0, TaskPriority::DiskWrite));
|
|
}
|
|
|
|
if (!self->memoryOnly) {
|
|
wait(self->pageFile->sync());
|
|
debug_printf("DWALPager(%s) commit version %" PRId64 " sync 1\n", self->filename.c_str(),
|
|
self->pHeader->committedVersion);
|
|
}
|
|
|
|
// Update header on disk and sync again.
|
|
wait(self->writeHeaderPage(0, self->headerPage));
|
|
if (g_network->getCurrentTask() > TaskPriority::DiskWrite) {
|
|
wait(delay(0, TaskPriority::DiskWrite));
|
|
}
|
|
|
|
if (!self->memoryOnly) {
|
|
wait(self->pageFile->sync());
|
|
debug_printf("DWALPager(%s) commit version %" PRId64 " sync 2\n", self->filename.c_str(),
|
|
self->pHeader->committedVersion);
|
|
}
|
|
|
|
// Update the last committed header for use in the next commit.
|
|
self->updateCommittedHeader();
|
|
self->addLatestSnapshot();
|
|
|
|
// Try to expire snapshots up to the oldest version, in case some were being kept around due to being in use,
|
|
// because maybe some are no longer in use.
|
|
self->expireSnapshots(self->pHeader->oldestVersion);
|
|
|
|
// Start unmapping pages for expired versions
|
|
self->remapCleanupFuture = remapCleanup(self);
|
|
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> commit() override {
|
|
// Can't have more than one commit outstanding.
|
|
ASSERT(commitFuture.isReady());
|
|
commitFuture = forwardError(commit_impl(this), errorPromise);
|
|
return commitFuture;
|
|
}
|
|
|
|
Key getMetaKey() const override { return pHeader->getMetaKey(); }
|
|
|
|
void setCommitVersion(Version v) override { pHeader->committedVersion = v; }
|
|
|
|
void setMetaKey(KeyRef metaKey) override { pHeader->setMetaKey(metaKey); }
|
|
|
|
ACTOR void shutdown(DWALPager* self, bool dispose) {
|
|
debug_printf("DWALPager(%s) shutdown cancel recovery\n", self->filename.c_str());
|
|
self->recoverFuture.cancel();
|
|
debug_printf("DWALPager(%s) shutdown cancel commit\n", self->filename.c_str());
|
|
self->commitFuture.cancel();
|
|
debug_printf("DWALPager(%s) shutdown cancel remap\n", self->filename.c_str());
|
|
self->remapCleanupFuture.cancel();
|
|
|
|
if (self->errorPromise.canBeSet()) {
|
|
debug_printf("DWALPager(%s) shutdown sending error\n", self->filename.c_str());
|
|
self->errorPromise.sendError(actor_cancelled()); // Ideally this should be shutdown_in_progress
|
|
}
|
|
|
|
// Must wait for pending operations to complete, canceling them can cause a crash because the underlying
|
|
// operations may be uncancellable and depend on memory from calling scope's page reference
|
|
debug_printf("DWALPager(%s) shutdown wait for operations\n", self->filename.c_str());
|
|
wait(self->operations.signal());
|
|
|
|
debug_printf("DWALPager(%s) shutdown destroy page cache\n", self->filename.c_str());
|
|
wait(self->pageCache.clear());
|
|
|
|
// Unreference the file and clear
|
|
self->pageFile.clear();
|
|
if (dispose) {
|
|
if (!self->memoryOnly) {
|
|
debug_printf("DWALPager(%s) shutdown deleting file\n", self->filename.c_str());
|
|
wait(IAsyncFileSystem::filesystem()->incrementalDeleteFile(self->filename, true));
|
|
}
|
|
}
|
|
|
|
self->closedPromise.send(Void());
|
|
delete self;
|
|
}
|
|
|
|
void dispose() override { shutdown(this, true); }
|
|
|
|
void close() override { shutdown(this, false); }
|
|
|
|
Future<Void> getError() override { return errorPromise.getFuture(); }
|
|
|
|
Future<Void> onClosed() override { return closedPromise.getFuture(); }
|
|
|
|
StorageBytes getStorageBytes() const override {
|
|
ASSERT(recoverFuture.isReady());
|
|
int64_t free;
|
|
int64_t total;
|
|
if (memoryOnly) {
|
|
total = pageCacheBytes;
|
|
free = pageCacheBytes - ((int64_t)pageCache.count() * physicalPageSize);
|
|
} else {
|
|
g_network->getDiskBytes(parentDirectory(filename), free, total);
|
|
}
|
|
int64_t pagerSize = pHeader->pageCount * physicalPageSize;
|
|
|
|
// It is not exactly known how many pages on the delayed free list are usable as of right now. It could be
|
|
// known, if each commit delayed entries that were freeable were shuffled from the delayed free queue to the
|
|
// free queue, but this doesn't seem necessary.
|
|
int64_t reusable = (freeList.numEntries + delayedFreeList.numEntries) * physicalPageSize;
|
|
|
|
return StorageBytes(free, total, pagerSize - reusable, free + reusable);
|
|
}
|
|
|
|
ACTOR static Future<Void> getUserPageCount_cleanup(DWALPager* self) {
|
|
// Wait for the remap eraser to finish all of its work (not triggering stop)
|
|
wait(self->remapCleanupFuture);
|
|
|
|
// Flush queues so there are no pending freelist operations
|
|
wait(flushQueues(self));
|
|
|
|
return Void();
|
|
}
|
|
|
|
// Get the number of pages in use by the pager's user
|
|
Future<int64_t> getUserPageCount() override {
|
|
return map(getUserPageCount_cleanup(this), [=](Void) {
|
|
int64_t userPages = pHeader->pageCount - 2 - freeList.numPages - freeList.numEntries -
|
|
delayedFreeList.numPages - delayedFreeList.numEntries - remapQueue.numPages;
|
|
|
|
debug_printf("DWALPager(%s) userPages=%" PRId64 " totalPageCount=%" PRId64 " freeQueuePages=%" PRId64
|
|
" freeQueueCount=%" PRId64 " delayedFreeQueuePages=%" PRId64 " delayedFreeQueueCount=%" PRId64
|
|
" remapQueuePages=%" PRId64 " remapQueueCount=%" PRId64 "\n",
|
|
filename.c_str(), userPages, pHeader->pageCount, freeList.numPages, freeList.numEntries,
|
|
delayedFreeList.numPages, delayedFreeList.numEntries, remapQueue.numPages,
|
|
remapQueue.numEntries);
|
|
return userPages;
|
|
});
|
|
}
|
|
|
|
Future<Void> init() override { return recoverFuture; }
|
|
|
|
Version getLatestVersion() const override { return pLastCommittedHeader->committedVersion; }
|
|
|
|
private:
|
|
~DWALPager() {}
|
|
|
|
// Try to expire snapshots up to but not including v, but do not expire any snapshots that are in use.
|
|
void expireSnapshots(Version v);
|
|
|
|
#pragma pack(push, 1)
|
|
// Header is the format of page 0 of the database
|
|
struct Header {
|
|
static constexpr int FORMAT_VERSION = 2;
|
|
uint16_t formatVersion;
|
|
uint32_t pageSize;
|
|
int64_t pageCount;
|
|
FIFOQueue<LogicalPageID>::QueueState freeList;
|
|
FIFOQueue<DelayedFreePage>::QueueState delayedFreeList;
|
|
FIFOQueue<RemappedPage>::QueueState remapQueue;
|
|
Version committedVersion;
|
|
Version oldestVersion;
|
|
int32_t metaKeySize;
|
|
|
|
KeyRef getMetaKey() const { return KeyRef((const uint8_t*)(this + 1), metaKeySize); }
|
|
|
|
void setMetaKey(StringRef key) {
|
|
ASSERT(key.size() < (smallestPhysicalBlock - sizeof(Header)));
|
|
metaKeySize = key.size();
|
|
if (key.size() > 0) {
|
|
memcpy(this + 1, key.begin(), key.size());
|
|
}
|
|
}
|
|
|
|
int size() const { return sizeof(Header) + metaKeySize; }
|
|
|
|
private:
|
|
Header();
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
struct PageCacheEntry {
|
|
Future<Reference<IPage>> readFuture;
|
|
Future<Void> writeFuture;
|
|
|
|
bool initialized() const { return readFuture.isValid(); }
|
|
|
|
bool reading() const { return !readFuture.isReady(); }
|
|
|
|
bool writing() const { return !writeFuture.isReady(); }
|
|
|
|
bool evictable() const {
|
|
// Don't evict if a page is still being read or written
|
|
return !reading() && !writing();
|
|
}
|
|
|
|
Future<Void> onEvictable() const { return ready(readFuture) && writeFuture; }
|
|
};
|
|
|
|
// Physical page sizes will always be a multiple of 4k because AsyncFileNonDurable requires
|
|
// this in simulation, and it also makes sense for current SSDs.
|
|
// Allowing a smaller 'logical' page size is very useful for testing.
|
|
static constexpr int smallestPhysicalBlock = 4096;
|
|
int physicalPageSize;
|
|
int logicalPageSize; // In simulation testing it can be useful to use a small logical page size
|
|
|
|
int64_t pageCacheBytes;
|
|
|
|
// The header will be written to / read from disk as a smallestPhysicalBlock sized chunk.
|
|
Reference<IPage> headerPage;
|
|
Header* pHeader;
|
|
|
|
int desiredPageSize;
|
|
|
|
Reference<IPage> lastCommittedHeaderPage;
|
|
Header* pLastCommittedHeader;
|
|
|
|
std::string filename;
|
|
bool memoryOnly;
|
|
|
|
typedef ObjectCache<LogicalPageID, PageCacheEntry> PageCacheT;
|
|
PageCacheT pageCache;
|
|
|
|
Promise<Void> closedPromise;
|
|
Promise<Void> errorPromise;
|
|
Future<Void> commitFuture;
|
|
SignalableActorCollection operations;
|
|
Future<Void> recoverFuture;
|
|
Future<Void> remapCleanupFuture;
|
|
bool remapCleanupStop;
|
|
|
|
Reference<IAsyncFile> pageFile;
|
|
|
|
LogicalPageQueueT freeList;
|
|
|
|
// The delayed free list will be approximately in Version order.
|
|
// TODO: Make this an ordered container some day.
|
|
DelayedFreePageQueueT delayedFreeList;
|
|
|
|
RemapQueueT remapQueue;
|
|
Version remapCleanupWindow;
|
|
|
|
struct SnapshotEntry {
|
|
Version version;
|
|
Promise<Void> expired;
|
|
Reference<DWALPagerSnapshot> snapshot;
|
|
};
|
|
|
|
struct SnapshotEntryLessThanVersion {
|
|
bool operator()(Version v, const SnapshotEntry& snapshot) { return v < snapshot.version; }
|
|
|
|
bool operator()(const SnapshotEntry& snapshot, Version v) { return snapshot.version < v; }
|
|
};
|
|
|
|
// TODO: Better data structure
|
|
PageToVersionedMapT remappedPages;
|
|
|
|
std::deque<SnapshotEntry> snapshots;
|
|
};
|
|
|
|
// Prevents pager from reusing freed pages from version until the snapshot is destroyed
|
|
class DWALPagerSnapshot : public IPagerSnapshot, public ReferenceCounted<DWALPagerSnapshot> {
|
|
public:
|
|
DWALPagerSnapshot(DWALPager* pager, Key meta, Version version, Future<Void> expiredFuture)
|
|
: pager(pager), metaKey(meta), version(version), expired(expiredFuture) {}
|
|
virtual ~DWALPagerSnapshot() {}
|
|
|
|
Future<Reference<const IPage>> getPhysicalPage(LogicalPageID pageID, bool cacheable, bool noHit) override {
|
|
if (expired.isError()) {
|
|
throw expired.getError();
|
|
}
|
|
return map(pager->readPageAtVersion(pageID, version, cacheable, noHit),
|
|
[=](Reference<IPage> p) { return Reference<const IPage>(p); });
|
|
}
|
|
|
|
Key getMetaKey() const override { return metaKey; }
|
|
|
|
Version getVersion() const override { return version; }
|
|
|
|
void addref() override { ReferenceCounted<DWALPagerSnapshot>::addref(); }
|
|
|
|
void delref() override { ReferenceCounted<DWALPagerSnapshot>::delref(); }
|
|
|
|
DWALPager* pager;
|
|
Future<Void> expired;
|
|
Version version;
|
|
Key metaKey;
|
|
};
|
|
|
|
void DWALPager::expireSnapshots(Version v) {
|
|
debug_printf("DWALPager(%s) expiring snapshots through %" PRId64 " snapshot count %d\n", filename.c_str(), v,
|
|
(int)snapshots.size());
|
|
while (snapshots.size() > 1 && snapshots.front().version < v && snapshots.front().snapshot->isSoleOwner()) {
|
|
debug_printf("DWALPager(%s) expiring snapshot for %" PRId64 " soleOwner=%d\n", filename.c_str(),
|
|
snapshots.front().version, snapshots.front().snapshot->isSoleOwner());
|
|
// The snapshot contract could be made such that the expired promise isn't need anymore. In practice it
|
|
// probably is already not needed but it will gracefully handle the case where a user begins a page read
|
|
// with a snapshot reference, keeps the page read future, and drops the snapshot reference.
|
|
snapshots.front().expired.sendError(transaction_too_old());
|
|
snapshots.pop_front();
|
|
}
|
|
}
|
|
|
|
Reference<IPagerSnapshot> DWALPager::getReadSnapshot(Version v) {
|
|
ASSERT(!snapshots.empty());
|
|
|
|
auto i = std::upper_bound(snapshots.begin(), snapshots.end(), v, SnapshotEntryLessThanVersion());
|
|
if (i == snapshots.begin()) {
|
|
throw version_invalid();
|
|
}
|
|
--i;
|
|
return i->snapshot;
|
|
}
|
|
|
|
void DWALPager::addLatestSnapshot() {
|
|
Promise<Void> expired;
|
|
snapshots.push_back({ pLastCommittedHeader->committedVersion, expired,
|
|
Reference<DWALPagerSnapshot>(new DWALPagerSnapshot(this, pLastCommittedHeader->getMetaKey(),
|
|
pLastCommittedHeader->committedVersion,
|
|
expired.getFuture())) });
|
|
}
|
|
|
|
// TODO: Move this to a flow header once it is mature.
|
|
struct SplitStringRef {
|
|
StringRef a;
|
|
StringRef b;
|
|
|
|
SplitStringRef(StringRef a = StringRef(), StringRef b = StringRef()) : a(a), b(b) {}
|
|
|
|
SplitStringRef(Arena& arena, const SplitStringRef& toCopy) : a(toStringRef(arena)), b() {}
|
|
|
|
SplitStringRef prefix(int len) const {
|
|
if (len <= a.size()) {
|
|
return SplitStringRef(a.substr(0, len));
|
|
}
|
|
len -= a.size();
|
|
return SplitStringRef(a, b.substr(0, len));
|
|
}
|
|
|
|
StringRef toStringRef(Arena& arena) const {
|
|
StringRef c = makeString(size(), arena);
|
|
memcpy(mutateString(c), a.begin(), a.size());
|
|
memcpy(mutateString(c) + a.size(), b.begin(), b.size());
|
|
return c;
|
|
}
|
|
|
|
Standalone<StringRef> toStringRef() const {
|
|
Arena a;
|
|
return Standalone<StringRef>(toStringRef(a), a);
|
|
}
|
|
|
|
int size() const { return a.size() + b.size(); }
|
|
|
|
int expectedSize() const { return size(); }
|
|
|
|
std::string toString() const { return format("%s%s", a.toString().c_str(), b.toString().c_str()); }
|
|
|
|
std::string toHexString() const { return format("%s%s", a.toHexString().c_str(), b.toHexString().c_str()); }
|
|
|
|
struct const_iterator {
|
|
const uint8_t* ptr;
|
|
const uint8_t* end;
|
|
const uint8_t* next;
|
|
|
|
inline bool operator==(const const_iterator& rhs) const { return ptr == rhs.ptr; }
|
|
inline bool operator!=(const const_iterator& rhs) const { return !(*this == rhs); }
|
|
|
|
inline const_iterator& operator++() {
|
|
++ptr;
|
|
if (ptr == end) {
|
|
ptr = next;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
inline const_iterator& operator+(int n) {
|
|
ptr += n;
|
|
if (ptr >= end) {
|
|
ptr = next + (ptr - end);
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
inline uint8_t operator*() const { return *ptr; }
|
|
};
|
|
|
|
inline const_iterator begin() const { return { a.begin(), a.end(), b.begin() }; }
|
|
|
|
inline const_iterator end() const { return { b.end() }; }
|
|
|
|
template <typename StringT>
|
|
int compare(const StringT& rhs) const {
|
|
auto j = begin();
|
|
auto k = rhs.begin();
|
|
auto jEnd = end();
|
|
auto kEnd = rhs.end();
|
|
|
|
while (j != jEnd && k != kEnd) {
|
|
int cmp = *j - *k;
|
|
if (cmp != 0) {
|
|
return cmp;
|
|
}
|
|
}
|
|
|
|
// If we've reached the end of *this, then values are equal if rhs is also exhausted, otherwise *this is less
|
|
// than rhs
|
|
if (j == jEnd) {
|
|
return k == kEnd ? 0 : -1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
};
|
|
|
|
// A BTree "page id" is actually a list of LogicalPageID's whose contents should be concatenated together.
|
|
// NOTE: Uses host byte order
|
|
typedef VectorRef<LogicalPageID> BTreePageIDRef;
|
|
constexpr LogicalPageID maxPageID = (LogicalPageID)-1;
|
|
|
|
std::string toString(BTreePageIDRef id) {
|
|
return std::string("BTreePageID") + toString(id.begin(), id.end());
|
|
}
|
|
|
|
#define STR(x) LiteralStringRef(x)
|
|
struct RedwoodRecordRef {
|
|
typedef uint8_t byte;
|
|
|
|
RedwoodRecordRef(KeyRef key = KeyRef(), Version ver = 0, Optional<ValueRef> value = {})
|
|
: key(key), version(ver), value(value) {}
|
|
|
|
RedwoodRecordRef(Arena& arena, const RedwoodRecordRef& toCopy) : key(arena, toCopy.key), version(toCopy.version) {
|
|
if (toCopy.value.present()) {
|
|
value = ValueRef(arena, toCopy.value.get());
|
|
}
|
|
}
|
|
|
|
KeyValueRef toKeyValueRef() const { return KeyValueRef(key, value.get()); }
|
|
|
|
// RedwoodRecordRefs are used for both internal and leaf pages of the BTree.
|
|
// Boundary records in internal pages are made from leaf records.
|
|
// These functions make creating and working with internal page records more convenient.
|
|
inline BTreePageIDRef getChildPage() const {
|
|
ASSERT(value.present());
|
|
return BTreePageIDRef((LogicalPageID*)value.get().begin(), value.get().size() / sizeof(LogicalPageID));
|
|
}
|
|
|
|
inline void setChildPage(BTreePageIDRef id) {
|
|
value = ValueRef((const uint8_t*)id.begin(), id.size() * sizeof(LogicalPageID));
|
|
}
|
|
|
|
inline void setChildPage(Arena& arena, BTreePageIDRef id) {
|
|
value = ValueRef(arena, (const uint8_t*)id.begin(), id.size() * sizeof(LogicalPageID));
|
|
}
|
|
|
|
inline RedwoodRecordRef withPageID(BTreePageIDRef id) const {
|
|
return RedwoodRecordRef(key, version, ValueRef((const uint8_t*)id.begin(), id.size() * sizeof(LogicalPageID)));
|
|
}
|
|
|
|
inline RedwoodRecordRef withoutValue() const { return RedwoodRecordRef(key, version); }
|
|
|
|
inline RedwoodRecordRef withMaxPageID() const {
|
|
return RedwoodRecordRef(key, version, StringRef((uint8_t*)&maxPageID, sizeof(maxPageID)));
|
|
}
|
|
|
|
// Truncate (key, version, part) tuple to len bytes.
|
|
void truncate(int len) {
|
|
ASSERT(len <= key.size());
|
|
key = key.substr(0, len);
|
|
version = 0;
|
|
}
|
|
|
|
// Find the common key prefix between two records, assuming that the first skipLen bytes are the same
|
|
inline int getCommonPrefixLen(const RedwoodRecordRef& other, int skipLen = 0) const {
|
|
return skipLen + commonPrefixLength(key, other.key, skipLen);
|
|
}
|
|
|
|
// Compares and orders by key, version, chunk.total, chunk.start, value
|
|
// This is the same order that delta compression uses for prefix borrowing
|
|
int compare(const RedwoodRecordRef& rhs, int skip = 0) const {
|
|
int keySkip = std::min(skip, key.size());
|
|
int cmp = key.substr(keySkip).compare(rhs.key.substr(keySkip));
|
|
|
|
if (cmp == 0) {
|
|
cmp = version - rhs.version;
|
|
if (cmp == 0) {
|
|
cmp = value.compare(rhs.value);
|
|
}
|
|
}
|
|
return cmp;
|
|
}
|
|
|
|
bool sameUserKey(const StringRef& k, int skipLen) const {
|
|
// Keys are the same if the sizes are the same and either the skipLen is longer or the non-skipped suffixes are
|
|
// the same.
|
|
return (key.size() == k.size()) && (key.substr(skipLen) == k.substr(skipLen));
|
|
}
|
|
|
|
bool sameExceptValue(const RedwoodRecordRef& rhs, int skipLen = 0) const {
|
|
return sameUserKey(rhs.key, skipLen) && version == rhs.version;
|
|
}
|
|
|
|
// TODO: Use SplitStringRef (unless it ends up being slower)
|
|
KeyRef key;
|
|
Optional<ValueRef> value;
|
|
Version version;
|
|
|
|
int expectedSize() const { return key.expectedSize() + value.expectedSize(); }
|
|
int kvBytes() const { return expectedSize(); }
|
|
|
|
class Reader {
|
|
public:
|
|
Reader(const void* ptr) : rptr((const byte*)ptr) {}
|
|
|
|
const byte* rptr;
|
|
|
|
StringRef readString(int len) {
|
|
StringRef s(rptr, len);
|
|
rptr += len;
|
|
return s;
|
|
}
|
|
};
|
|
|
|
#pragma pack(push, 1)
|
|
struct Delta {
|
|
|
|
uint8_t flags;
|
|
|
|
// Four field sizing schemes ranging from 3 to 8 bytes, with 3 being the most common.
|
|
union {
|
|
struct {
|
|
uint8_t prefixLength;
|
|
uint8_t suffixLength;
|
|
uint8_t valueLength;
|
|
} LengthFormat0;
|
|
|
|
struct {
|
|
uint8_t prefixLength;
|
|
uint8_t suffixLength;
|
|
uint16_t valueLength;
|
|
} LengthFormat1;
|
|
|
|
struct {
|
|
uint8_t prefixLength;
|
|
uint8_t suffixLength;
|
|
uint32_t valueLength;
|
|
} LengthFormat2;
|
|
|
|
struct {
|
|
uint16_t prefixLength;
|
|
uint16_t suffixLength;
|
|
uint32_t valueLength;
|
|
} LengthFormat3;
|
|
};
|
|
|
|
struct int48_t {
|
|
static constexpr int64_t MASK = 0xFFFFFFFFFFFFLL;
|
|
int32_t high;
|
|
int16_t low;
|
|
};
|
|
|
|
static constexpr int LengthFormatSizes[] = { sizeof(LengthFormat0), sizeof(LengthFormat1),
|
|
sizeof(LengthFormat2), sizeof(LengthFormat3) };
|
|
static constexpr int VersionDeltaSizes[] = { 0, sizeof(int32_t), sizeof(int48_t), sizeof(int64_t) };
|
|
|
|
// Serialized Format
|
|
//
|
|
// Flags - 1 byte
|
|
// 1 bit - borrow source is prev ancestor (otherwise next ancestor)
|
|
// 1 bit - item is deleted
|
|
// 1 bit - has value (different from zero-length value, if 0 value len will be 0)
|
|
// 1 bits - has nonzero version
|
|
// 2 bits - version delta integer size code, maps to 0, 4, 6, 8
|
|
// 2 bits - length fields format
|
|
//
|
|
// Length fields using 3 to 8 bytes total depending on length fields format
|
|
//
|
|
// Byte strings
|
|
// Key suffix bytes
|
|
// Value bytes
|
|
// Version delta bytes
|
|
//
|
|
|
|
enum EFlags {
|
|
PREFIX_SOURCE_PREV = 0x80,
|
|
IS_DELETED = 0x40,
|
|
HAS_VALUE = 0x20,
|
|
HAS_VERSION = 0x10,
|
|
VERSION_DELTA_SIZE = 0xC,
|
|
LENGTHS_FORMAT = 0x03
|
|
};
|
|
|
|
static inline int determineLengthFormat(int prefixLength, int suffixLength, int valueLength) {
|
|
// Large prefix or suffix length, which should be rare, is format 3
|
|
if (prefixLength > 0xFF || suffixLength > 0xFF) {
|
|
return 3;
|
|
} else if (valueLength < 0x100) {
|
|
return 0;
|
|
} else if (valueLength < 0x10000) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
|
|
// Large prefix or suffix length, which should be rare, is format 3
|
|
byte* data() const {
|
|
switch (flags & LENGTHS_FORMAT) {
|
|
case 0:
|
|
return (byte*)(&LengthFormat0 + 1);
|
|
case 1:
|
|
return (byte*)(&LengthFormat1 + 1);
|
|
case 2:
|
|
return (byte*)(&LengthFormat2 + 1);
|
|
case 3:
|
|
default:
|
|
return (byte*)(&LengthFormat3 + 1);
|
|
}
|
|
}
|
|
|
|
int getKeyPrefixLength() const {
|
|
switch (flags & LENGTHS_FORMAT) {
|
|
case 0:
|
|
return LengthFormat0.prefixLength;
|
|
case 1:
|
|
return LengthFormat1.prefixLength;
|
|
case 2:
|
|
return LengthFormat2.prefixLength;
|
|
case 3:
|
|
default:
|
|
return LengthFormat3.prefixLength;
|
|
}
|
|
}
|
|
|
|
int getKeySuffixLength() const {
|
|
switch (flags & LENGTHS_FORMAT) {
|
|
case 0:
|
|
return LengthFormat0.suffixLength;
|
|
case 1:
|
|
return LengthFormat1.suffixLength;
|
|
case 2:
|
|
return LengthFormat2.suffixLength;
|
|
case 3:
|
|
default:
|
|
return LengthFormat3.suffixLength;
|
|
}
|
|
}
|
|
|
|
int getValueLength() const {
|
|
switch (flags & LENGTHS_FORMAT) {
|
|
case 0:
|
|
return LengthFormat0.valueLength;
|
|
case 1:
|
|
return LengthFormat1.valueLength;
|
|
case 2:
|
|
return LengthFormat2.valueLength;
|
|
case 3:
|
|
default:
|
|
return LengthFormat3.valueLength;
|
|
}
|
|
}
|
|
|
|
StringRef getKeySuffix() const { return StringRef(data(), getKeySuffixLength()); }
|
|
|
|
StringRef getValue() const { return StringRef(data() + getKeySuffixLength(), getValueLength()); }
|
|
|
|
bool hasVersion() const { return flags & HAS_VERSION; }
|
|
|
|
int getVersionDeltaSizeBytes() const {
|
|
int code = (flags & VERSION_DELTA_SIZE) >> 2;
|
|
return VersionDeltaSizes[code];
|
|
}
|
|
|
|
static int getVersionDeltaSizeBytes(Version d) {
|
|
if (d == 0) {
|
|
return 0;
|
|
} else if (d == (int32_t)d) {
|
|
return sizeof(int32_t);
|
|
} else if (d == (d & int48_t::MASK)) {
|
|
return sizeof(int48_t);
|
|
}
|
|
return sizeof(int64_t);
|
|
}
|
|
|
|
int getVersionDelta(const uint8_t* r) const {
|
|
int code = (flags & VERSION_DELTA_SIZE) >> 2;
|
|
switch (code) {
|
|
case 0:
|
|
return 0;
|
|
case 1:
|
|
return *(int32_t*)r;
|
|
case 2:
|
|
return (((int64_t)((int48_t*)r)->high) << 16) | (((int48_t*)r)->low & 0xFFFF);
|
|
case 3:
|
|
default:
|
|
return *(int64_t*)r;
|
|
}
|
|
}
|
|
|
|
// Version delta size should be 0 before calling
|
|
int setVersionDelta(Version d, uint8_t* w) {
|
|
flags |= HAS_VERSION;
|
|
if (d == 0) {
|
|
return 0;
|
|
} else if (d == (int32_t)d) {
|
|
flags |= 1 << 2;
|
|
*(uint32_t*)w = d;
|
|
return sizeof(uint32_t);
|
|
} else if (d == (d & int48_t::MASK)) {
|
|
flags |= 2 << 2;
|
|
((int48_t*)w)->high = d >> 16;
|
|
((int48_t*)w)->low = d;
|
|
return sizeof(int48_t);
|
|
} else {
|
|
flags |= 3 << 2;
|
|
*(int64_t*)w = d;
|
|
return sizeof(int64_t);
|
|
}
|
|
}
|
|
|
|
bool hasValue() const { return flags & HAS_VALUE; }
|
|
|
|
void setPrefixSource(bool val) {
|
|
if (val) {
|
|
flags |= PREFIX_SOURCE_PREV;
|
|
} else {
|
|
flags &= ~PREFIX_SOURCE_PREV;
|
|
}
|
|
}
|
|
|
|
bool getPrefixSource() const { return flags & PREFIX_SOURCE_PREV; }
|
|
|
|
void setDeleted(bool val) {
|
|
if (val) {
|
|
flags |= IS_DELETED;
|
|
} else {
|
|
flags &= ~IS_DELETED;
|
|
}
|
|
}
|
|
|
|
bool getDeleted() const { return flags & IS_DELETED; }
|
|
|
|
RedwoodRecordRef apply(const RedwoodRecordRef& base, Arena& arena) const {
|
|
int keyPrefixLen = getKeyPrefixLength();
|
|
int keySuffixLen = getKeySuffixLength();
|
|
int valueLen = hasValue() ? getValueLength() : 0;
|
|
|
|
StringRef k;
|
|
|
|
Reader r(data());
|
|
// If there is a key suffix, reconstitute the complete key into a contiguous string
|
|
if (keySuffixLen > 0) {
|
|
StringRef keySuffix = r.readString(keySuffixLen);
|
|
k = makeString(keyPrefixLen + keySuffixLen, arena);
|
|
memcpy(mutateString(k), base.key.begin(), keyPrefixLen);
|
|
memcpy(mutateString(k) + keyPrefixLen, keySuffix.begin(), keySuffixLen);
|
|
} else {
|
|
// Otherwise just reference the base key's memory
|
|
k = base.key.substr(0, keyPrefixLen);
|
|
}
|
|
|
|
Optional<ValueRef> value;
|
|
if (hasValue()) {
|
|
value = r.readString(valueLen);
|
|
}
|
|
|
|
Version v = 0;
|
|
if (hasVersion()) {
|
|
v = base.version + getVersionDelta(r.rptr);
|
|
}
|
|
|
|
return RedwoodRecordRef(k, v, value);
|
|
}
|
|
|
|
int size() const {
|
|
int size = 1 + getVersionDeltaSizeBytes();
|
|
switch (flags & LENGTHS_FORMAT) {
|
|
case 0:
|
|
return size + sizeof(LengthFormat0) + LengthFormat0.suffixLength + LengthFormat0.valueLength;
|
|
case 1:
|
|
return size + sizeof(LengthFormat1) + LengthFormat1.suffixLength + LengthFormat1.valueLength;
|
|
case 2:
|
|
return size + sizeof(LengthFormat2) + LengthFormat2.suffixLength + LengthFormat2.valueLength;
|
|
case 3:
|
|
default:
|
|
return size + sizeof(LengthFormat3) + LengthFormat3.suffixLength + LengthFormat3.valueLength;
|
|
}
|
|
}
|
|
|
|
std::string toString() const {
|
|
std::string flagString = " ";
|
|
if (flags & PREFIX_SOURCE_PREV) {
|
|
flagString += "PrefixSource|";
|
|
}
|
|
if (flags & IS_DELETED) {
|
|
flagString += "IsDeleted|";
|
|
}
|
|
if (hasValue()) {
|
|
flagString += "HasValue|";
|
|
}
|
|
if (hasVersion()) {
|
|
flagString += "HasVersion|";
|
|
}
|
|
int lengthFormat = flags & LENGTHS_FORMAT;
|
|
|
|
Reader r(data());
|
|
int prefixLen = getKeyPrefixLength();
|
|
int keySuffixLen = getKeySuffixLength();
|
|
int valueLen = getValueLength();
|
|
|
|
return format("lengthFormat: %d totalDeltaSize: %d flags: %s prefixLen: %d keySuffixLen: %d "
|
|
"versionDeltaSizeBytes: %d valueLen %d raw: %s",
|
|
lengthFormat, size(), flagString.c_str(), prefixLen, keySuffixLen, getVersionDeltaSizeBytes(),
|
|
valueLen, StringRef((const uint8_t*)this, size()).toHexString().c_str());
|
|
}
|
|
};
|
|
|
|
// Using this class as an alternative for Delta enables reading a DeltaTree<RecordRef> while only decoding
|
|
// its values, so the Reader does not require the original prev/next ancestors.
|
|
struct DeltaValueOnly : Delta {
|
|
RedwoodRecordRef apply(const RedwoodRecordRef& base, Arena& arena) const {
|
|
Optional<ValueRef> value;
|
|
|
|
if (hasValue()) {
|
|
value = getValue();
|
|
}
|
|
|
|
return RedwoodRecordRef(StringRef(), 0, value);
|
|
}
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
bool operator==(const RedwoodRecordRef& rhs) const { return compare(rhs) == 0; }
|
|
|
|
bool operator!=(const RedwoodRecordRef& rhs) const { return compare(rhs) != 0; }
|
|
|
|
bool operator<(const RedwoodRecordRef& rhs) const { return compare(rhs) < 0; }
|
|
|
|
bool operator>(const RedwoodRecordRef& rhs) const { return compare(rhs) > 0; }
|
|
|
|
bool operator<=(const RedwoodRecordRef& rhs) const { return compare(rhs) <= 0; }
|
|
|
|
bool operator>=(const RedwoodRecordRef& rhs) const { return compare(rhs) >= 0; }
|
|
|
|
// Worst case overhead means to assu
|
|
int deltaSize(const RedwoodRecordRef& base, int skipLen, bool worstCaseOverhead) const {
|
|
int prefixLen = getCommonPrefixLen(base, skipLen);
|
|
int keySuffixLen = key.size() - prefixLen;
|
|
int valueLen = value.present() ? value.get().size() : 0;
|
|
|
|
int formatType;
|
|
int versionBytes;
|
|
if (worstCaseOverhead) {
|
|
formatType = Delta::determineLengthFormat(key.size(), key.size(), valueLen);
|
|
versionBytes = version == 0 ? 0 : Delta::getVersionDeltaSizeBytes(version << 1);
|
|
} else {
|
|
formatType = Delta::determineLengthFormat(prefixLen, keySuffixLen, valueLen);
|
|
versionBytes = version == 0 ? 0 : Delta::getVersionDeltaSizeBytes(version - base.version);
|
|
}
|
|
|
|
return 1 + Delta::LengthFormatSizes[formatType] + keySuffixLen + valueLen + versionBytes;
|
|
}
|
|
|
|
// commonPrefix between *this and base can be passed if known
|
|
int writeDelta(Delta& d, const RedwoodRecordRef& base, int keyPrefixLen = -1) const {
|
|
d.flags = value.present() ? Delta::HAS_VALUE : 0;
|
|
|
|
if (keyPrefixLen < 0) {
|
|
keyPrefixLen = getCommonPrefixLen(base, 0);
|
|
}
|
|
|
|
StringRef keySuffix = key.substr(keyPrefixLen);
|
|
int valueLen = value.present() ? value.get().size() : 0;
|
|
|
|
int formatType = Delta::determineLengthFormat(keyPrefixLen, keySuffix.size(), valueLen);
|
|
d.flags |= formatType;
|
|
|
|
switch (formatType) {
|
|
case 0:
|
|
d.LengthFormat0.prefixLength = keyPrefixLen;
|
|
d.LengthFormat0.suffixLength = keySuffix.size();
|
|
d.LengthFormat0.valueLength = valueLen;
|
|
break;
|
|
case 1:
|
|
d.LengthFormat1.prefixLength = keyPrefixLen;
|
|
d.LengthFormat1.suffixLength = keySuffix.size();
|
|
d.LengthFormat1.valueLength = valueLen;
|
|
break;
|
|
case 2:
|
|
d.LengthFormat2.prefixLength = keyPrefixLen;
|
|
d.LengthFormat2.suffixLength = keySuffix.size();
|
|
d.LengthFormat2.valueLength = valueLen;
|
|
break;
|
|
case 3:
|
|
default:
|
|
d.LengthFormat3.prefixLength = keyPrefixLen;
|
|
d.LengthFormat3.suffixLength = keySuffix.size();
|
|
d.LengthFormat3.valueLength = valueLen;
|
|
break;
|
|
}
|
|
|
|
uint8_t* wptr = d.data();
|
|
// Write key suffix string
|
|
wptr = keySuffix.copyTo(wptr);
|
|
|
|
// Write value bytes
|
|
if (value.present()) {
|
|
wptr = value.get().copyTo(wptr);
|
|
}
|
|
|
|
if (version != 0) {
|
|
wptr += d.setVersionDelta(version - base.version, wptr);
|
|
}
|
|
|
|
return wptr - (uint8_t*)&d;
|
|
}
|
|
|
|
static std::string kvformat(StringRef s, int hexLimit = -1) {
|
|
bool hex = false;
|
|
|
|
for (auto c : s) {
|
|
if (!isprint(c)) {
|
|
hex = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return hex ? s.toHexString(hexLimit) : s.toString();
|
|
}
|
|
|
|
std::string toString(bool leaf = true) const {
|
|
std::string r;
|
|
r += format("'%s'@%" PRId64 " => ", key.printable().c_str(), version);
|
|
if (value.present()) {
|
|
if (leaf) {
|
|
r += format("'%s'", kvformat(value.get()).c_str());
|
|
} else {
|
|
r += format("[%s]", ::toString(getChildPage()).c_str());
|
|
}
|
|
} else {
|
|
r += "(absent)";
|
|
}
|
|
return r;
|
|
}
|
|
};
|
|
|
|
struct BTreePage {
|
|
typedef DeltaTree<RedwoodRecordRef> BinaryTree;
|
|
typedef DeltaTree<RedwoodRecordRef, RedwoodRecordRef::DeltaValueOnly> ValueTree;
|
|
|
|
#pragma pack(push, 1)
|
|
struct {
|
|
uint8_t height;
|
|
uint32_t kvBytes;
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
int size() const {
|
|
auto& t = tree();
|
|
return (uint8_t*)&t - (uint8_t*)this + t.size();
|
|
}
|
|
|
|
bool isLeaf() const { return height == 1; }
|
|
|
|
BinaryTree& tree() { return *(BinaryTree*)(this + 1); }
|
|
|
|
const BinaryTree& tree() const { return *(const BinaryTree*)(this + 1); }
|
|
|
|
const ValueTree& valueTree() const { return *(const ValueTree*)(this + 1); }
|
|
|
|
// TODO: boundaries are for decoding, but upper
|
|
std::string toString(bool write, BTreePageIDRef id, Version ver, const RedwoodRecordRef* lowerBound,
|
|
const RedwoodRecordRef* upperBound) const {
|
|
std::string r;
|
|
r += format("BTreePage op=%s %s @%" PRId64
|
|
" ptr=%p height=%d count=%d kvBytes=%d\n lowerBound: %s\n upperBound: %s\n",
|
|
write ? "write" : "read", ::toString(id).c_str(), ver, this, height, (int)tree().numItems,
|
|
(int)kvBytes, lowerBound->toString(false).c_str(), upperBound->toString(false).c_str());
|
|
try {
|
|
if (tree().numItems > 0) {
|
|
// This doesn't use the cached reader for the page because it is only for debugging purposes,
|
|
// a cached reader may not exist
|
|
BinaryTree::Mirror reader(&tree(), lowerBound, upperBound);
|
|
BinaryTree::Cursor c = reader.getCursor();
|
|
|
|
c.moveFirst();
|
|
ASSERT(c.valid());
|
|
|
|
bool anyOutOfRange = false;
|
|
do {
|
|
r += " ";
|
|
r += c.get().toString(height == 1);
|
|
|
|
bool tooLow = c.get().withoutValue() < lowerBound->withoutValue();
|
|
bool tooHigh = c.get().withoutValue() >= upperBound->withoutValue();
|
|
if (tooLow || tooHigh) {
|
|
anyOutOfRange = true;
|
|
if (tooLow) {
|
|
r += " (below decode lower bound)";
|
|
}
|
|
if (tooHigh) {
|
|
r += " (at or above decode upper bound)";
|
|
}
|
|
}
|
|
r += "\n";
|
|
|
|
} while (c.moveNext());
|
|
|
|
// Out of range entries are actually okay now and the result of subtree deletion followed by
|
|
// incremental insertions of records in the deleted range being added to an adjacent subtree
|
|
// which is logically expanded encompass the deleted range but still is using the original
|
|
// subtree boundaries as DeltaTree boundaries.
|
|
// ASSERT(!anyOutOfRange);
|
|
}
|
|
} catch (Error& e) {
|
|
debug_printf("BTreePage::toString ERROR: %s\n", e.what());
|
|
debug_printf("BTreePage::toString partial result: %s\n", r.c_str());
|
|
throw;
|
|
}
|
|
|
|
// All appends to r end in a linefeed, remove the final one.
|
|
r.resize(r.size() - 1);
|
|
return r;
|
|
}
|
|
};
|
|
|
|
static void makeEmptyRoot(Reference<IPage> page) {
|
|
BTreePage* btpage = (BTreePage*)page->begin();
|
|
btpage->height = 1;
|
|
btpage->kvBytes = 0;
|
|
btpage->tree().build(page->size(), nullptr, nullptr, nullptr, nullptr);
|
|
}
|
|
|
|
BTreePage::BinaryTree::Cursor getCursor(const Reference<const IPage>& page) {
|
|
return ((BTreePage::BinaryTree::Mirror*)page->userData)->getCursor();
|
|
}
|
|
|
|
struct BoundaryRefAndPage {
|
|
Standalone<RedwoodRecordRef> lowerBound;
|
|
Reference<IPage> firstPage;
|
|
std::vector<Reference<IPage>> extPages;
|
|
|
|
std::string toString() const {
|
|
return format("[%s, %d pages]", lowerBound.toString().c_str(), extPages.size() + (firstPage ? 1 : 0));
|
|
}
|
|
};
|
|
|
|
#define NOT_IMPLEMENTED UNSTOPPABLE_ASSERT(false)
|
|
|
|
#pragma pack(push, 1)
|
|
template <typename T, typename SizeT = int8_t>
|
|
struct InPlaceArray {
|
|
SizeT count;
|
|
|
|
const T* begin() const { return (T*)(this + 1); }
|
|
|
|
T* begin() { return (T*)(this + 1); }
|
|
|
|
const T* end() const { return begin() + count; }
|
|
|
|
T* end() { return begin() + count; }
|
|
|
|
VectorRef<T> get() { return VectorRef<T>(begin(), count); }
|
|
|
|
void set(VectorRef<T> v, int availableSpace) {
|
|
ASSERT(sizeof(T) * v.size() <= availableSpace);
|
|
count = v.size();
|
|
memcpy(begin(), v.begin(), sizeof(T) * v.size());
|
|
}
|
|
|
|
int extraSize() const { return count * sizeof(T); }
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
class VersionedBTree : public IVersionedStore {
|
|
public:
|
|
// The first possible internal record possible in the tree
|
|
static RedwoodRecordRef dbBegin;
|
|
// A record which is greater than the last possible record in the tree
|
|
static RedwoodRecordRef dbEnd;
|
|
|
|
struct LazyClearQueueEntry {
|
|
Version version;
|
|
Standalone<BTreePageIDRef> pageID;
|
|
|
|
bool operator<(const LazyClearQueueEntry& rhs) const { return version < rhs.version; }
|
|
|
|
int readFromBytes(const uint8_t* src) {
|
|
version = *(Version*)src;
|
|
src += sizeof(Version);
|
|
int count = *src++;
|
|
pageID = BTreePageIDRef((LogicalPageID*)src, count);
|
|
return bytesNeeded();
|
|
}
|
|
|
|
int bytesNeeded() const { return sizeof(Version) + 1 + (pageID.size() * sizeof(LogicalPageID)); }
|
|
|
|
int writeToBytes(uint8_t* dst) const {
|
|
*(Version*)dst = version;
|
|
dst += sizeof(Version);
|
|
*dst++ = pageID.size();
|
|
memcpy(dst, pageID.begin(), pageID.size() * sizeof(LogicalPageID));
|
|
return bytesNeeded();
|
|
}
|
|
|
|
std::string toString() const { return format("{%s @%" PRId64 "}", ::toString(pageID).c_str(), version); }
|
|
};
|
|
|
|
typedef FIFOQueue<LazyClearQueueEntry> LazyClearQueueT;
|
|
|
|
struct ParentInfo {
|
|
ParentInfo() {
|
|
count = 0;
|
|
bits = 0;
|
|
}
|
|
void clear() {
|
|
count = 0;
|
|
bits = 0;
|
|
}
|
|
|
|
static uint32_t mask(LogicalPageID id) {
|
|
return 1 << (id & 31);
|
|
}
|
|
|
|
void pageUpdated(LogicalPageID child) {
|
|
auto m = mask(child);
|
|
if((bits & m) == 0) {
|
|
bits |= m;
|
|
++count;
|
|
}
|
|
}
|
|
|
|
bool maybeUpdated(LogicalPageID child) {
|
|
return (mask(child) & bits) != 0;
|
|
}
|
|
|
|
uint32_t bits;
|
|
int count;
|
|
};
|
|
|
|
typedef std::unordered_map<LogicalPageID, ParentInfo> ParentInfoMapT;
|
|
|
|
#pragma pack(push, 1)
|
|
struct MetaKey {
|
|
static constexpr int FORMAT_VERSION = 8;
|
|
// This serves as the format version for the entire tree, individual pages will not be versioned
|
|
uint16_t formatVersion;
|
|
uint8_t height;
|
|
LazyClearQueueT::QueueState lazyDeleteQueue;
|
|
InPlaceArray<LogicalPageID> root;
|
|
|
|
KeyRef asKeyRef() const { return KeyRef((uint8_t*)this, sizeof(MetaKey) + root.extraSize()); }
|
|
|
|
void fromKeyRef(KeyRef k) {
|
|
memcpy(this, k.begin(), k.size());
|
|
ASSERT(formatVersion == FORMAT_VERSION);
|
|
}
|
|
|
|
std::string toString() {
|
|
return format("{height=%d formatVersion=%d root=%s lazyDeleteQueue=%s}", (int)height, (int)formatVersion,
|
|
::toString(root.get()).c_str(), lazyDeleteQueue.toString().c_str());
|
|
}
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
// All async opts on the btree are based on pager reads, writes, and commits, so
|
|
// we can mostly forward these next few functions to the pager
|
|
Future<Void> getError() { return m_pager->getError(); }
|
|
|
|
Future<Void> onClosed() { return m_pager->onClosed(); }
|
|
|
|
void close_impl(bool dispose) {
|
|
auto* pager = m_pager;
|
|
delete this;
|
|
if (dispose)
|
|
pager->dispose();
|
|
else
|
|
pager->close();
|
|
}
|
|
|
|
void dispose() { return close_impl(true); }
|
|
|
|
void close() { return close_impl(false); }
|
|
|
|
KeyValueStoreType getType() const override { NOT_IMPLEMENTED; }
|
|
bool supportsMutation(int op) const override { NOT_IMPLEMENTED; }
|
|
StorageBytes getStorageBytes() const override { return m_pager->getStorageBytes(); }
|
|
|
|
// Writes are provided in an ordered stream.
|
|
// A write is considered part of (a change leading to) the version determined by the previous call to
|
|
// setWriteVersion() A write shall not become durable until the following call to commit() begins, and shall be
|
|
// durable once the following call to commit() returns
|
|
void set(KeyValueRef keyValue) override {
|
|
++g_redwoodMetrics.opSet;
|
|
g_redwoodMetrics.opSetKeyBytes += keyValue.key.size();
|
|
g_redwoodMetrics.opSetValueBytes += keyValue.value.size();
|
|
m_pBuffer->insert(keyValue.key).mutation().setBoundaryValue(m_pBuffer->copyToArena(keyValue.value));
|
|
}
|
|
|
|
void clear(KeyRangeRef clearedRange) override {
|
|
// Optimization for single key clears to create just one mutation boundary instead of two
|
|
if (clearedRange.begin.size() == clearedRange.end.size() - 1 &&
|
|
clearedRange.end[clearedRange.end.size() - 1] == 0 && clearedRange.end.startsWith(clearedRange.begin)) {
|
|
++g_redwoodMetrics.opClear;
|
|
++g_redwoodMetrics.opClearKey;
|
|
m_pBuffer->insert(clearedRange.begin).mutation().clearBoundary();
|
|
return;
|
|
}
|
|
|
|
++g_redwoodMetrics.opClear;
|
|
MutationBuffer::iterator iBegin = m_pBuffer->insert(clearedRange.begin);
|
|
MutationBuffer::iterator iEnd = m_pBuffer->insert(clearedRange.end);
|
|
|
|
iBegin.mutation().clearAll();
|
|
++iBegin;
|
|
m_pBuffer->erase(iBegin, iEnd);
|
|
}
|
|
|
|
void mutate(int op, StringRef param1, StringRef param2) override { NOT_IMPLEMENTED; }
|
|
|
|
void setOldestVersion(Version v) override { m_newOldestVersion = v; }
|
|
|
|
Version getOldestVersion() const override { return m_pager->getOldestVersion(); }
|
|
|
|
Version getLatestVersion() const override {
|
|
if (m_writeVersion != invalidVersion) return m_writeVersion;
|
|
return m_pager->getLatestVersion();
|
|
}
|
|
|
|
Version getWriteVersion() const { return m_writeVersion; }
|
|
|
|
Version getLastCommittedVersion() const { return m_lastCommittedVersion; }
|
|
|
|
VersionedBTree(IPager2* pager, std::string name)
|
|
: m_pager(pager), m_writeVersion(invalidVersion), m_lastCommittedVersion(invalidVersion), m_pBuffer(nullptr),
|
|
m_commitReadLock(new FlowLock(SERVER_KNOBS->REDWOOD_COMMIT_CONCURRENT_READS)), m_name(name) {
|
|
|
|
m_lazyClearActor = 0;
|
|
m_init = init_impl(this);
|
|
m_latestCommit = m_init;
|
|
}
|
|
|
|
ACTOR static Future<int> incrementalLazyClear(VersionedBTree* self) {
|
|
ASSERT(self->m_lazyClearActor.isReady());
|
|
self->m_lazyClearStop = false;
|
|
|
|
// TODO: Is it contractually okay to always to read at the latest version?
|
|
state Reference<IPagerSnapshot> snapshot = self->m_pager->getReadSnapshot(self->m_pager->getLatestVersion());
|
|
state int freedPages = 0;
|
|
|
|
loop {
|
|
state int toPop = SERVER_KNOBS->REDWOOD_LAZY_CLEAR_BATCH_SIZE_PAGES;
|
|
state std::vector<std::pair<LazyClearQueueEntry, Future<Reference<const IPage>>>> entries;
|
|
entries.reserve(toPop);
|
|
|
|
// Take up to batchSize pages from front of queue
|
|
while (toPop > 0) {
|
|
Optional<LazyClearQueueEntry> q = wait(self->m_lazyClearQueue.pop());
|
|
debug_printf("LazyClear: popped %s\n", toString(q).c_str());
|
|
if (!q.present()) {
|
|
break;
|
|
}
|
|
// Start reading the page, without caching
|
|
entries.push_back(
|
|
std::make_pair(q.get(), self->readPage(snapshot, q.get().pageID, nullptr, nullptr, true)));
|
|
|
|
--toPop;
|
|
}
|
|
|
|
state int i;
|
|
for (i = 0; i < entries.size(); ++i) {
|
|
Reference<const IPage> p = wait(entries[i].second);
|
|
const LazyClearQueueEntry& entry = entries[i].first;
|
|
const BTreePage& btPage = *(BTreePage*)p->begin();
|
|
auto& metrics = g_redwoodMetrics.level(btPage.height);
|
|
|
|
debug_printf("LazyClear: processing %s\n", toString(entry).c_str());
|
|
|
|
// Level 1 (leaf) nodes should never be in the lazy delete queue
|
|
ASSERT(btPage.height > 1);
|
|
|
|
// Iterate over page entries, skipping key decoding using BTreePage::ValueTree which uses
|
|
// RedwoodRecordRef::DeltaValueOnly as the delta type type to skip key decoding
|
|
BTreePage::ValueTree::Mirror reader(&btPage.valueTree(), &dbBegin, &dbEnd);
|
|
auto c = reader.getCursor();
|
|
ASSERT(c.moveFirst());
|
|
Version v = entry.version;
|
|
while (1) {
|
|
if (c.get().value.present()) {
|
|
BTreePageIDRef btChildPageID = c.get().getChildPage();
|
|
// If this page is height 2, then the children are leaves so free them directly
|
|
if (btPage.height == 2) {
|
|
debug_printf("LazyClear: freeing child %s\n", toString(btChildPageID).c_str());
|
|
self->freeBTreePage(btChildPageID, v);
|
|
freedPages += btChildPageID.size();
|
|
metrics.lazyClearFree += 1;
|
|
metrics.lazyClearFreeExt += (btChildPageID.size() - 1);
|
|
} else {
|
|
// Otherwise, queue them for lazy delete.
|
|
debug_printf("LazyClear: queuing child %s\n", toString(btChildPageID).c_str());
|
|
self->m_lazyClearQueue.pushFront(LazyClearQueueEntry{ v, btChildPageID });
|
|
metrics.lazyClearRequeue += 1;
|
|
metrics.lazyClearRequeueExt += (btChildPageID.size() - 1);
|
|
}
|
|
}
|
|
if (!c.moveNext()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Free the page, now that its children have either been freed or queued
|
|
debug_printf("LazyClear: freeing queue entry %s\n", toString(entry.pageID).c_str());
|
|
self->freeBTreePage(entry.pageID, v);
|
|
freedPages += entry.pageID.size();
|
|
metrics.lazyClearFree += 1;
|
|
metrics.lazyClearFreeExt += entry.pageID.size() - 1;
|
|
}
|
|
|
|
// Stop if
|
|
// - the poppable items in the queue have already been exhausted
|
|
// - stop flag is set and we've freed the minimum number of pages required
|
|
// - maximum number of pages to free met or exceeded
|
|
if (toPop > 0 || (freedPages >= SERVER_KNOBS->REDWOOD_LAZY_CLEAR_MIN_PAGES && self->m_lazyClearStop) ||
|
|
(freedPages >= SERVER_KNOBS->REDWOOD_LAZY_CLEAR_MAX_PAGES)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
debug_printf("LazyClear: freed %d pages, %s has %" PRId64 " entries\n", freedPages,
|
|
self->m_lazyClearQueue.name.c_str(), self->m_lazyClearQueue.numEntries);
|
|
return freedPages;
|
|
}
|
|
|
|
ACTOR static Future<Void> init_impl(VersionedBTree* self) {
|
|
wait(self->m_pager->init());
|
|
|
|
self->m_blockSize = self->m_pager->getUsablePageSize();
|
|
state Version latest = self->m_pager->getLatestVersion();
|
|
self->m_newOldestVersion = self->m_pager->getOldestVersion();
|
|
|
|
debug_printf("Recovered pager to version %" PRId64 ", oldest version is %" PRId64 "\n",
|
|
self->m_newOldestVersion);
|
|
|
|
state Key meta = self->m_pager->getMetaKey();
|
|
if (meta.size() == 0) {
|
|
self->m_header.formatVersion = MetaKey::FORMAT_VERSION;
|
|
LogicalPageID id = wait(self->m_pager->newPageID());
|
|
BTreePageIDRef newRoot((LogicalPageID*)&id, 1);
|
|
debug_printf("new root %s\n", toString(newRoot).c_str());
|
|
self->m_header.root.set(newRoot, sizeof(headerSpace) - sizeof(m_header));
|
|
self->m_header.height = 1;
|
|
++latest;
|
|
Reference<IPage> page = self->m_pager->newPageBuffer();
|
|
makeEmptyRoot(page);
|
|
self->m_pager->updatePage(id, page);
|
|
self->m_pager->setCommitVersion(latest);
|
|
|
|
LogicalPageID newQueuePage = wait(self->m_pager->newPageID());
|
|
self->m_lazyClearQueue.create(self->m_pager, newQueuePage, "LazyClearQueue");
|
|
self->m_header.lazyDeleteQueue = self->m_lazyClearQueue.getState();
|
|
self->m_pager->setMetaKey(self->m_header.asKeyRef());
|
|
wait(self->m_pager->commit());
|
|
debug_printf("Committed initial commit.\n");
|
|
} else {
|
|
self->m_header.fromKeyRef(meta);
|
|
self->m_lazyClearQueue.recover(self->m_pager, self->m_header.lazyDeleteQueue, "LazyClearQueueRecovered");
|
|
}
|
|
|
|
debug_printf("Recovered btree at version %" PRId64 ": %s\n", latest, self->m_header.toString().c_str());
|
|
|
|
self->m_lastCommittedVersion = latest;
|
|
self->m_lazyClearActor = incrementalLazyClear(self);
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> init() override { return m_init; }
|
|
|
|
virtual ~VersionedBTree() {
|
|
// This probably shouldn't be called directly (meaning deleting an instance directly) but it should be safe,
|
|
// it will cancel init and commit and leave the pager alive but with potentially an incomplete set of
|
|
// uncommitted writes so it should not be committed.
|
|
m_init.cancel();
|
|
m_latestCommit.cancel();
|
|
}
|
|
|
|
Reference<IStoreCursor> readAtVersion(Version v) {
|
|
// Only committed versions can be read.
|
|
ASSERT(v <= m_lastCommittedVersion);
|
|
Reference<IPagerSnapshot> snapshot = m_pager->getReadSnapshot(v);
|
|
|
|
// This is a ref because snapshot will continue to hold the metakey value memory
|
|
KeyRef m = snapshot->getMetaKey();
|
|
|
|
// Currently all internal records generated in the write path are at version 0
|
|
return Reference<IStoreCursor>(new Cursor(snapshot, ((MetaKey*)m.begin())->root.get(), (Version)0));
|
|
}
|
|
|
|
// Must be nondecreasing
|
|
void setWriteVersion(Version v) {
|
|
ASSERT(v > m_lastCommittedVersion);
|
|
// If there was no current mutation buffer, create one in the buffer map and update m_pBuffer
|
|
if (m_pBuffer == nullptr) {
|
|
// When starting a new mutation buffer its start version must be greater than the last write version
|
|
ASSERT(v > m_writeVersion);
|
|
m_pBuffer = &m_mutationBuffers[v];
|
|
} else {
|
|
// It's OK to set the write version to the same version repeatedly so long as m_pBuffer is not null
|
|
ASSERT(v >= m_writeVersion);
|
|
}
|
|
m_writeVersion = v;
|
|
}
|
|
|
|
Future<Void> commit() override {
|
|
if (m_pBuffer == nullptr) return m_latestCommit;
|
|
return commit_impl(this);
|
|
}
|
|
|
|
ACTOR static Future<Void> clearAllAndCheckSanity_impl(VersionedBTree* self) {
|
|
ASSERT(g_network->isSimulated());
|
|
|
|
debug_printf("Clearing tree.\n");
|
|
self->setWriteVersion(self->getLatestVersion() + 1);
|
|
self->clear(KeyRangeRef(dbBegin.key, dbEnd.key));
|
|
wait(self->commit());
|
|
|
|
// Loop commits until the the lazy delete queue is completely processed.
|
|
loop {
|
|
wait(self->commit());
|
|
|
|
// If the lazy delete queue is completely processed then the last time the lazy delete actor
|
|
// was started it, after the last commit, it would exist immediately and do no work, so its
|
|
// future would be ready and its value would be 0.
|
|
if (self->m_lazyClearActor.isReady() && self->m_lazyClearActor.get() == 0) {
|
|
break;
|
|
}
|
|
self->setWriteVersion(self->getLatestVersion() + 1);
|
|
}
|
|
|
|
// Forget all but the latest version of the tree.
|
|
debug_printf("Discarding all old versions.\n");
|
|
self->setOldestVersion(self->getLastCommittedVersion());
|
|
self->setWriteVersion(self->getLatestVersion() + 1);
|
|
wait(self->commit());
|
|
|
|
// The lazy delete queue should now be empty and contain only the new page to start writing to
|
|
// on the next commit.
|
|
LazyClearQueueT::QueueState s = self->m_lazyClearQueue.getState();
|
|
ASSERT(s.numEntries == 0);
|
|
ASSERT(s.numPages == 1);
|
|
|
|
// The btree should now be a single non-oversized root page.
|
|
ASSERT(self->m_header.height == 1);
|
|
ASSERT(self->m_header.root.count == 1);
|
|
|
|
// From the pager's perspective the only pages that should be in use are the btree root and
|
|
// the previously mentioned lazy delete queue page.
|
|
int64_t userPageCount = wait(self->m_pager->getUserPageCount());
|
|
ASSERT(userPageCount == 2);
|
|
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> clearAllAndCheckSanity() { return clearAllAndCheckSanity_impl(this); }
|
|
|
|
private:
|
|
// Represents a change to a single key - set, clear, or atomic op
|
|
struct SingleKeyMutation {
|
|
// Clear
|
|
SingleKeyMutation() : op(MutationRef::ClearRange) {}
|
|
// Set
|
|
SingleKeyMutation(Value val) : op(MutationRef::SetValue), value(val) {}
|
|
// Atomic Op
|
|
SingleKeyMutation(MutationRef::Type op, Value val) : op(op), value(val) {}
|
|
|
|
MutationRef::Type op;
|
|
Value value;
|
|
|
|
inline bool isClear() const { return op == MutationRef::ClearRange; }
|
|
inline bool isSet() const { return op == MutationRef::SetValue; }
|
|
inline bool isAtomicOp() const { return !isSet() && !isClear(); }
|
|
|
|
inline bool equalToSet(ValueRef val) { return isSet() && value == val; }
|
|
|
|
inline RedwoodRecordRef toRecord(KeyRef userKey, Version version) const {
|
|
// No point in serializing an atomic op, it needs to be coalesced to a real value.
|
|
ASSERT(!isAtomicOp());
|
|
|
|
if (isClear()) return RedwoodRecordRef(userKey, version);
|
|
|
|
return RedwoodRecordRef(userKey, version, value);
|
|
}
|
|
|
|
std::string toString() const { return format("op=%d val='%s'", op, printable(value).c_str()); }
|
|
};
|
|
|
|
struct RangeMutation {
|
|
RangeMutation() : boundaryChanged(false), clearAfterBoundary(false) {}
|
|
|
|
bool boundaryChanged;
|
|
Optional<ValueRef> boundaryValue; // Not present means cleared
|
|
bool clearAfterBoundary;
|
|
|
|
bool boundaryCleared() const { return boundaryChanged && !boundaryValue.present(); }
|
|
|
|
// Returns true if this RangeMutation doesn't actually mutate anything
|
|
bool noChanges() const { return !boundaryChanged && !clearAfterBoundary; }
|
|
|
|
void clearBoundary() {
|
|
boundaryChanged = true;
|
|
boundaryValue.reset();
|
|
}
|
|
|
|
void clearAll() {
|
|
clearBoundary();
|
|
clearAfterBoundary = true;
|
|
}
|
|
|
|
void setBoundaryValue(ValueRef v) {
|
|
boundaryChanged = true;
|
|
boundaryValue = v;
|
|
}
|
|
|
|
bool boundarySet() const { return boundaryChanged && boundaryValue.present(); }
|
|
|
|
std::string toString() const {
|
|
return format("boundaryChanged=%d clearAfterBoundary=%d boundaryValue=%s", boundaryChanged,
|
|
clearAfterBoundary, ::toString(boundaryValue).c_str());
|
|
}
|
|
};
|
|
|
|
public:
|
|
#include "fdbserver/ArtMutationBuffer.h"
|
|
struct MutationBufferStdMap {
|
|
MutationBufferStdMap() {
|
|
// Create range representing the entire keyspace. This reduces edge cases to applying mutations
|
|
// because now all existing keys are within some range in the mutation map.
|
|
mutations[dbBegin.key];
|
|
// Setting the dbEnd key to be cleared prevents having to treat a range clear to dbEnd as a special
|
|
// case in order to avoid traversing down the rightmost edge of the tree.
|
|
mutations[dbEnd.key].clearBoundary();
|
|
}
|
|
|
|
private:
|
|
typedef std::map<KeyRef, RangeMutation> MutationsT;
|
|
Arena arena;
|
|
MutationsT mutations;
|
|
|
|
public:
|
|
struct iterator : public MutationsT::iterator {
|
|
typedef MutationsT::iterator Base;
|
|
iterator() = default;
|
|
iterator(const MutationsT::iterator& i) : Base(i) {}
|
|
|
|
const KeyRef& key() { return (*this)->first; }
|
|
|
|
RangeMutation& mutation() { return (*this)->second; }
|
|
};
|
|
|
|
struct const_iterator : public MutationsT::const_iterator {
|
|
typedef MutationsT::const_iterator Base;
|
|
const_iterator() = default;
|
|
const_iterator(const MutationsT::const_iterator& i) : Base(i) {}
|
|
const_iterator(const MutationsT::iterator& i) : Base(i) {}
|
|
|
|
const KeyRef& key() { return (*this)->first; }
|
|
|
|
const RangeMutation& mutation() { return (*this)->second; }
|
|
};
|
|
|
|
// Return a T constructed in arena
|
|
template <typename T>
|
|
T copyToArena(const T& object) {
|
|
return T(arena, object);
|
|
}
|
|
|
|
const_iterator upper_bound(const KeyRef& k) const { return mutations.upper_bound(k); }
|
|
|
|
const_iterator lower_bound(const KeyRef& k) const { return mutations.lower_bound(k); }
|
|
|
|
// erase [begin, end) from the mutation map
|
|
void erase(const const_iterator& begin, const const_iterator& end) { mutations.erase(begin, end); }
|
|
|
|
// Find or create a mutation buffer boundary for bound and return an iterator to it
|
|
iterator insert(KeyRef boundary) {
|
|
// Find the first split point in buffer that is >= key
|
|
// Since the initial state of the mutation buffer contains the range '' through
|
|
// the maximum possible key, our search had to have found something so we
|
|
// can assume the iterator is valid.
|
|
iterator ib = mutations.lower_bound(boundary);
|
|
|
|
// If we found the boundary we are looking for, return its iterator
|
|
if (ib.key() == boundary) {
|
|
return ib;
|
|
}
|
|
|
|
// ib is our insert hint. Copy boundary into arena and insert boundary into buffer
|
|
boundary = KeyRef(arena, boundary);
|
|
ib = mutations.insert(ib, { boundary, RangeMutation() });
|
|
|
|
// ib is certainly > begin() because it is guaranteed that the empty string
|
|
// boundary exists and the only way to have found that is to look explicitly
|
|
// for it in which case we would have returned above.
|
|
iterator iPrevious = ib;
|
|
--iPrevious;
|
|
// If the range we just divided was being cleared, then the dividing boundary key and range after it must
|
|
// also be cleared
|
|
if (iPrevious.mutation().clearAfterBoundary) {
|
|
ib.mutation().clearAll();
|
|
}
|
|
|
|
return ib;
|
|
}
|
|
};
|
|
#define USE_ART_MUTATION_BUFFER 1
|
|
|
|
#ifdef USE_ART_MUTATION_BUFFER
|
|
typedef struct MutationBufferART MutationBuffer;
|
|
#else
|
|
typedef struct MutationBufferStdMap MutationBuffer;
|
|
#endif
|
|
|
|
private:
|
|
/* Mutation Buffer Overview
|
|
*
|
|
* This structure's organization is meant to put pending updates for the btree in an order
|
|
* that makes it efficient to query all pending mutations across all pending versions which are
|
|
* relevant to a particular subtree of the btree.
|
|
*
|
|
* At the top level, it is a map of the start of a range being modified to a RangeMutation.
|
|
* The end of the range is map key (which is the next range start in the map).
|
|
*
|
|
* - The buffer starts out with keys '' and endKVV.key already populated.
|
|
*
|
|
* - When a new key is inserted into the buffer map, it is by definition
|
|
* splitting an existing range so it should take on the rangeClearVersion of
|
|
* the immediately preceding key which is the start of that range
|
|
*
|
|
* - Keys are inserted into the buffer map for every individual operation (set/clear/atomic)
|
|
* key and for both the start and end of a range clear.
|
|
*
|
|
* - To apply a single clear, add it to the individual ops only if the last entry is not also a clear.
|
|
*
|
|
* - To apply a range clear, after inserting the new range boundaries do the following to the start
|
|
* boundary and all successive boundaries < end
|
|
* - set the range clear version if not already set
|
|
* - add a clear to the startKeyMutations if the final entry is not a clear.
|
|
*
|
|
* - Note that there are actually TWO valid ways to represent
|
|
* set c = val1 at version 1
|
|
* clear c\x00 to z at version 2
|
|
* with this model. Either
|
|
* c = { rangeClearVersion = 2, startKeyMutations = { 1 => val1 }
|
|
* z = { rangeClearVersion = <not present>, startKeyMutations = {}
|
|
* OR
|
|
* c = { rangeClearVersion = <not present>, startKeyMutations = { 1 => val1 }
|
|
* c\x00 = { rangeClearVersion = 2, startKeyMutations = { 2 => <not present> }
|
|
* z = { rangeClearVersion = <not present>, startKeyMutations = {}
|
|
*
|
|
* This is because the rangeClearVersion applies to a range begining with the first
|
|
* key AFTER the start key, so that the logic for reading the start key is more simple
|
|
* as it only involves consulting startKeyMutations. When adding a clear range, the
|
|
* boundary key insert/split described above is valid, and is what is currently done,
|
|
* but it would also be valid to see if the last key before startKey is equal to
|
|
* keyBefore(startKey), and if so that mutation buffer boundary key can be used instead
|
|
* without adding an additional key to the buffer.
|
|
|
|
* TODO: A possible optimization here could be to only use existing btree leaf page boundaries as keys,
|
|
* with mutation point keys being stored in an unsorted strucutre under those boundary map keys,
|
|
* to be sorted later just before being merged into the existing leaf page.
|
|
*/
|
|
|
|
IPager2* m_pager;
|
|
MutationBuffer* m_pBuffer;
|
|
std::map<Version, MutationBuffer> m_mutationBuffers;
|
|
|
|
Version m_writeVersion;
|
|
Version m_lastCommittedVersion;
|
|
Version m_newOldestVersion;
|
|
Reference<FlowLock> m_commitReadLock;
|
|
Future<Void> m_latestCommit;
|
|
Future<Void> m_init;
|
|
std::string m_name;
|
|
int m_blockSize;
|
|
std::unordered_map<LogicalPageID, ParentInfo> parents;
|
|
ParentInfoMapT childUpdateTracker;
|
|
|
|
// MetaKey changes size so allocate space for it to expand into
|
|
union {
|
|
uint8_t headerSpace[sizeof(MetaKey) + sizeof(LogicalPageID) * 30];
|
|
MetaKey m_header;
|
|
};
|
|
|
|
LazyClearQueueT m_lazyClearQueue;
|
|
Future<int> m_lazyClearActor;
|
|
bool m_lazyClearStop;
|
|
|
|
// Writes entries to 1 or more pages and return a vector of boundary keys with their IPage(s)
|
|
ACTOR static Future<Standalone<VectorRef<RedwoodRecordRef>>> writePages(
|
|
VersionedBTree* self, const RedwoodRecordRef* lowerBound, const RedwoodRecordRef* upperBound,
|
|
VectorRef<RedwoodRecordRef> entries, int height, Version v, BTreePageIDRef previousID) {
|
|
ASSERT(entries.size() > 0);
|
|
state Standalone<VectorRef<RedwoodRecordRef>> records;
|
|
|
|
// This is how much space for the binary tree exists in the page, after the header
|
|
state int blockSize = self->m_blockSize;
|
|
state int pageSize = blockSize - sizeof(BTreePage);
|
|
state int pageFillTarget = pageSize * SERVER_KNOBS->REDWOOD_PAGE_REBUILD_FILL_FACTOR;
|
|
state int blockCount = 1;
|
|
|
|
state int kvBytes = 0;
|
|
state int compressedBytes = BTreePage::BinaryTree::emptyTreeSize();
|
|
state bool largeTree = false;
|
|
|
|
state int start = 0;
|
|
state int i = 0;
|
|
// The common prefix length between the first and last records are common to all records
|
|
state int skipLen = entries.front().getCommonPrefixLen(entries.back());
|
|
|
|
// Leaves can have just one record if it's large, but internal pages should have at least 4
|
|
state int minimumEntries = (height == 1 ? 1 : 4);
|
|
|
|
// Lower bound of the page being added to
|
|
state RedwoodRecordRef pageLowerBound = lowerBound->withoutValue();
|
|
state RedwoodRecordRef pageUpperBound;
|
|
|
|
while (1) {
|
|
// While there are still entries to add and the page isn't full enough, add an entry
|
|
while (i < entries.size() && (i - start < minimumEntries || compressedBytes < pageFillTarget)) {
|
|
const RedwoodRecordRef& entry = entries[i];
|
|
|
|
// Get delta from previous record or page lower boundary if this is the first item in a page
|
|
const RedwoodRecordRef& base = (i == start) ? pageLowerBound : entries[i - 1];
|
|
|
|
// All record pairs in entries have skipLen bytes in common with each other, but for i == 0 the base is
|
|
// lowerBound
|
|
int skip = i == 0 ? 0 : skipLen;
|
|
|
|
// In a delta tree, all common prefix bytes that can be borrowed, will be, but not necessarily
|
|
// by the same records during the linear estimate of the built page size. Since the key suffix bytes
|
|
// and therefore the key prefix lengths can be distributed differently in the balanced tree, worst case
|
|
// overhead for the delta size must be assumed.
|
|
int deltaSize = entry.deltaSize(base, skip, true);
|
|
|
|
int nodeSize = BTreePage::BinaryTree::Node::headerSize(largeTree) + deltaSize;
|
|
debug_printf("Adding %3d of %3lu (i=%3d) klen %4d vlen %5d nodeSize %5d deltaSize %5d page usage: "
|
|
"%d/%d (%.2f%%) record=%s\n",
|
|
i + 1, entries.size(), i, entry.key.size(), entry.value.orDefault(StringRef()).size(),
|
|
nodeSize, deltaSize, compressedBytes, pageSize, (float)compressedBytes / pageSize * 100,
|
|
entry.toString(height == 1).c_str());
|
|
|
|
// While the node doesn't fit, expand the page.
|
|
// This is a loop because if the page size moves into "large" range for DeltaTree
|
|
// then the overhead will increase, which could require another page expansion.
|
|
int spaceAvailable = pageSize - compressedBytes;
|
|
if (nodeSize > spaceAvailable) {
|
|
// Figure out how many additional whole or partial blocks are needed
|
|
// newBlocks = ceil ( additional space needed / block size)
|
|
int newBlocks = 1 + (nodeSize - spaceAvailable - 1) / blockSize;
|
|
int newPageSize = pageSize + (newBlocks * blockSize);
|
|
|
|
// If we've moved into "large" page range for the delta tree then add additional overhead required
|
|
if (!largeTree && newPageSize > BTreePage::BinaryTree::SmallSizeLimit) {
|
|
largeTree = true;
|
|
// Add increased overhead for the current node to nodeSize
|
|
nodeSize += BTreePage::BinaryTree::LargeTreePerNodeExtraOverhead;
|
|
// Add increased overhead for all previously added nodes
|
|
compressedBytes += (i - start) * BTreePage::BinaryTree::LargeTreePerNodeExtraOverhead;
|
|
|
|
// Update calculations above made with previous overhead sizes
|
|
spaceAvailable = pageSize - compressedBytes;
|
|
newBlocks = 1 + (nodeSize - spaceAvailable - 1) / blockSize;
|
|
newPageSize = pageSize + (newBlocks * blockSize);
|
|
}
|
|
|
|
blockCount += newBlocks;
|
|
pageSize = newPageSize;
|
|
pageFillTarget = pageSize * SERVER_KNOBS->REDWOOD_PAGE_REBUILD_FILL_FACTOR;
|
|
}
|
|
|
|
kvBytes += entry.kvBytes();
|
|
compressedBytes += nodeSize;
|
|
++i;
|
|
}
|
|
|
|
// Flush the accumulated records to a page
|
|
state int nextStart = i;
|
|
// If we are building internal pages and there is a record after this page (index nextStart) but it has an
|
|
// empty childPage value then skip it. It only exists to serve as an upper boundary for a child page that
|
|
// has not been rewritten in the current commit, and that purpose will now be served by the upper bound of
|
|
// the page we are now building.
|
|
if (height != 1 && nextStart < entries.size() && !entries[nextStart].value.present()) {
|
|
++nextStart;
|
|
}
|
|
|
|
// Use the next entry as the upper bound, or upperBound if there are no more entries beyond this page
|
|
pageUpperBound = (i == entries.size()) ? upperBound->withoutValue() : entries[i].withoutValue();
|
|
|
|
// If this is a leaf page, and not the last one to be written, shorten the upper boundary
|
|
state bool isLastPage = (nextStart == entries.size());
|
|
if (!isLastPage && height == 1) {
|
|
int commonPrefix = pageUpperBound.getCommonPrefixLen(entries[i - 1], 0);
|
|
pageUpperBound.truncate(commonPrefix + 1);
|
|
}
|
|
|
|
state std::vector<Reference<IPage>> pages;
|
|
BTreePage* btPage;
|
|
|
|
int capacity = blockSize * blockCount;
|
|
if (blockCount == 1) {
|
|
Reference<IPage> page = self->m_pager->newPageBuffer();
|
|
btPage = (BTreePage*)page->mutate();
|
|
pages.push_back(std::move(page));
|
|
} else {
|
|
ASSERT(blockCount > 1);
|
|
btPage = (BTreePage*)new uint8_t[capacity];
|
|
}
|
|
|
|
btPage->height = height;
|
|
btPage->kvBytes = kvBytes;
|
|
|
|
debug_printf(
|
|
"Building tree. start=%d i=%d count=%d page usage: %d/%d (%.2f%%) bytes\nlower: %s\nupper: %s\n",
|
|
start, i, i - start, compressedBytes, pageSize, (float)compressedBytes / pageSize * 100,
|
|
pageLowerBound.toString(false).c_str(), pageUpperBound.toString(false).c_str());
|
|
|
|
int written =
|
|
btPage->tree().build(pageSize, &entries[start], &entries[i], &pageLowerBound, &pageUpperBound);
|
|
if (written > pageSize) {
|
|
debug_printf("ERROR: Wrote %d bytes to %d byte page (%d blocks). recs %d kvBytes %d compressed %d\n",
|
|
written, pageSize, blockCount, i - start, kvBytes, compressedBytes);
|
|
fprintf(stderr,
|
|
"ERROR: Wrote %d bytes to %d byte page (%d blocks). recs %d kvBytes %d compressed %d\n",
|
|
written, pageSize, blockCount, i - start, kvBytes, compressedBytes);
|
|
ASSERT(false);
|
|
}
|
|
|
|
auto& metrics = g_redwoodMetrics.level(btPage->height);
|
|
metrics.pageBuild += 1;
|
|
metrics.pageBuildExt += blockCount - 1;
|
|
metrics.buildFillPct += (double)written / capacity;
|
|
metrics.buildStoredPct += (double)btPage->kvBytes / capacity;
|
|
metrics.buildItemCount += btPage->tree().numItems;
|
|
|
|
// Create chunked pages
|
|
// TODO: Avoid copying page bytes, but this is not trivial due to how pager checksums are currently handled.
|
|
if (blockCount != 1) {
|
|
// Mark the slack in the page buffer as defined
|
|
VALGRIND_MAKE_MEM_DEFINED(((uint8_t*)btPage) + written, (blockCount * blockSize) - written);
|
|
const uint8_t* rptr = (const uint8_t*)btPage;
|
|
for (int b = 0; b < blockCount; ++b) {
|
|
Reference<IPage> page = self->m_pager->newPageBuffer();
|
|
memcpy(page->mutate(), rptr, blockSize);
|
|
rptr += blockSize;
|
|
pages.push_back(std::move(page));
|
|
}
|
|
delete[](uint8_t*) btPage;
|
|
}
|
|
|
|
// Write this btree page, which is made of 1 or more pager pages.
|
|
state int p;
|
|
state BTreePageIDRef childPageID;
|
|
|
|
// If we are only writing 1 page and it has the same BTreePageID size as the original then try to reuse the
|
|
// LogicalPageIDs in previousID and try to update them atomically.
|
|
bool isOnlyPage = isLastPage && (start == 0);
|
|
if (isOnlyPage && previousID.size() == pages.size()) {
|
|
for (p = 0; p < pages.size(); ++p) {
|
|
LogicalPageID id = wait(self->m_pager->atomicUpdatePage(previousID[p], pages[p], v));
|
|
childPageID.push_back(records.arena(), id);
|
|
}
|
|
} else {
|
|
// Either the original page is being split, or it's not but it has changed BTreePageID size.
|
|
// Either way, there is no point in reusing any of the original page IDs because the parent
|
|
// must be rewritten anyway to count for the change in child count or child links.
|
|
// Free the old IDs, but only once (before the first output record is added).
|
|
if (records.empty()) {
|
|
self->freeBTreePage(previousID, v);
|
|
}
|
|
for (p = 0; p < pages.size(); ++p) {
|
|
LogicalPageID id = wait(self->m_pager->newPageID());
|
|
self->m_pager->updatePage(id, pages[p]);
|
|
childPageID.push_back(records.arena(), id);
|
|
}
|
|
}
|
|
|
|
wait(yield());
|
|
|
|
debug_printf("Flushing %s lastPage=%d original=%s start=%d i=%d count=%d page usage: %d/%d (%.2f%%) "
|
|
"bytes\nlower: %s\nupper: %s\n",
|
|
toString(childPageID).c_str(), isLastPage, toString(previousID).c_str(), start, i, i - start,
|
|
compressedBytes, pageSize, (float)compressedBytes / pageSize * 100,
|
|
pageLowerBound.toString(false).c_str(), pageUpperBound.toString(false).c_str());
|
|
|
|
if (REDWOOD_DEBUG) {
|
|
for (int j = start; j < i; ++j) {
|
|
debug_printf(" %3d: %s\n", j, entries[j].toString(height == 1).c_str());
|
|
}
|
|
ASSERT(pageLowerBound.key <= pageUpperBound.key);
|
|
}
|
|
|
|
// Push a new record onto the results set, without the child page, copying it into the records arena
|
|
records.push_back_deep(records.arena(), pageLowerBound.withoutValue());
|
|
// Set the child page value of the inserted record to childPageID, which has already been allocated in
|
|
// records.arena() above
|
|
records.back().setChildPage(childPageID);
|
|
|
|
if (isLastPage) {
|
|
break;
|
|
}
|
|
|
|
start = nextStart;
|
|
kvBytes = 0;
|
|
compressedBytes = BTreePage::BinaryTree::emptyTreeSize();
|
|
pageLowerBound = pageUpperBound;
|
|
}
|
|
|
|
// If we're writing internal pages, if the last entry was the start of a new page and had an empty child link
|
|
// then it would not be written to a page. This means that the upper boundary for the the page set being built
|
|
// is not the upper bound of the final page in that set, so it must be added to the output set to preserve the
|
|
// decodability of the subtree to its left. Fortunately, this is easy to detect because the loop above would
|
|
// exit before i has reached the item count.
|
|
if (height != 1 && i != entries.size()) {
|
|
debug_printf("Adding dummy record to avoid writing useless page containing only one null link: %s\n",
|
|
pageUpperBound.toString(false).c_str());
|
|
records.push_back_deep(records.arena(), pageUpperBound);
|
|
}
|
|
|
|
return records;
|
|
}
|
|
|
|
ACTOR static Future<Standalone<VectorRef<RedwoodRecordRef>>> buildNewRoot(
|
|
VersionedBTree* self, Version version, Standalone<VectorRef<RedwoodRecordRef>> records, int height) {
|
|
debug_printf("buildNewRoot start version %" PRId64 ", %lu records\n", version, records.size());
|
|
|
|
// While there are multiple child pages for this version we must write new tree levels.
|
|
while (records.size() > 1) {
|
|
self->m_header.height = ++height;
|
|
Standalone<VectorRef<RedwoodRecordRef>> newRecords =
|
|
wait(writePages(self, &dbBegin, &dbEnd, records, height, version, BTreePageIDRef()));
|
|
debug_printf("Wrote a new root level at version %" PRId64 " height %d size %lu pages\n", version, height,
|
|
newRecords.size());
|
|
records = newRecords;
|
|
}
|
|
|
|
return records;
|
|
}
|
|
|
|
class SuperPage : public IPage, ReferenceCounted<SuperPage>, public FastAllocated<SuperPage> {
|
|
public:
|
|
SuperPage(std::vector<Reference<const IPage>> pages) {
|
|
int blockSize = pages.front()->size();
|
|
m_size = blockSize * pages.size();
|
|
m_data = new uint8_t[m_size];
|
|
uint8_t* wptr = m_data;
|
|
for (auto& p : pages) {
|
|
ASSERT(p->size() == blockSize);
|
|
memcpy(wptr, p->begin(), blockSize);
|
|
wptr += blockSize;
|
|
}
|
|
}
|
|
|
|
virtual ~SuperPage() { delete[] m_data; }
|
|
|
|
virtual Reference<IPage> clone() const {
|
|
return Reference<IPage>(new SuperPage({ Reference<const IPage>::addRef(this) }));
|
|
}
|
|
|
|
void addref() const { ReferenceCounted<SuperPage>::addref(); }
|
|
|
|
void delref() const { ReferenceCounted<SuperPage>::delref(); }
|
|
|
|
int size() const { return m_size; }
|
|
|
|
uint8_t const* begin() const { return m_data; }
|
|
|
|
uint8_t* mutate() { return m_data; }
|
|
|
|
private:
|
|
uint8_t* m_data;
|
|
int m_size;
|
|
};
|
|
|
|
ACTOR static Future<Reference<const IPage>> readPage(Reference<IPagerSnapshot> snapshot, BTreePageIDRef id,
|
|
const RedwoodRecordRef* lowerBound,
|
|
const RedwoodRecordRef* upperBound,
|
|
bool forLazyClear = false) {
|
|
if (!forLazyClear) {
|
|
debug_printf("readPage() op=read %s @%" PRId64 " lower=%s upper=%s\n", toString(id).c_str(),
|
|
snapshot->getVersion(), lowerBound->toString(false).c_str(),
|
|
upperBound->toString(false).c_str());
|
|
} else {
|
|
debug_printf("readPage() op=readForDeferredClear %s @%" PRId64 " \n", toString(id).c_str(),
|
|
snapshot->getVersion());
|
|
}
|
|
|
|
wait(yield());
|
|
|
|
state Reference<const IPage> page;
|
|
|
|
if (id.size() == 1) {
|
|
Reference<const IPage> p = wait(snapshot->getPhysicalPage(id.front(), !forLazyClear, false));
|
|
page = p;
|
|
} else {
|
|
ASSERT(!id.empty());
|
|
std::vector<Future<Reference<const IPage>>> reads;
|
|
for (auto& pageID : id) {
|
|
reads.push_back(snapshot->getPhysicalPage(pageID, !forLazyClear, false));
|
|
}
|
|
std::vector<Reference<const IPage>> pages = wait(getAll(reads));
|
|
// TODO: Cache reconstituted super pages somehow, perhaps with help from the Pager.
|
|
page = Reference<const IPage>(new SuperPage(pages));
|
|
}
|
|
|
|
debug_printf("readPage() op=readComplete %s @%" PRId64 " \n", toString(id).c_str(), snapshot->getVersion());
|
|
const BTreePage* pTreePage = (const BTreePage*)page->begin();
|
|
auto& metrics = g_redwoodMetrics.level(pTreePage->height);
|
|
metrics.pageRead += 1;
|
|
metrics.pageReadExt += (id.size() - 1);
|
|
|
|
if (!forLazyClear && page->userData == nullptr) {
|
|
debug_printf("readPage() Creating Reader for %s @%" PRId64 " lower=%s upper=%s\n", toString(id).c_str(),
|
|
snapshot->getVersion(), lowerBound->toString(false).c_str(),
|
|
upperBound->toString(false).c_str());
|
|
page->userData = new BTreePage::BinaryTree::Mirror(&pTreePage->tree(), lowerBound, upperBound);
|
|
page->userDataDestructor = [](void* ptr) { delete (BTreePage::BinaryTree::Mirror*)ptr; };
|
|
}
|
|
|
|
if (!forLazyClear) {
|
|
debug_printf("readPage() %s\n",
|
|
pTreePage->toString(false, id, snapshot->getVersion(), lowerBound, upperBound).c_str());
|
|
}
|
|
|
|
return page;
|
|
}
|
|
|
|
static void preLoadPage(IPagerSnapshot* snapshot, BTreePageIDRef id) {
|
|
g_redwoodMetrics.btreeLeafPreload += 1;
|
|
g_redwoodMetrics.btreeLeafPreloadExt += (id.size() - 1);
|
|
|
|
for (auto pageID : id) {
|
|
snapshot->getPhysicalPage(pageID, true, true);
|
|
}
|
|
}
|
|
|
|
void freeBTreePage(BTreePageIDRef btPageID, Version v) {
|
|
// Free individual pages at v
|
|
for (LogicalPageID id : btPageID) {
|
|
m_pager->freePage(id, v);
|
|
}
|
|
}
|
|
|
|
// Write new version of pageID at version v using page as its data.
|
|
// Attempts to reuse original id(s) in btPageID, returns BTreePageID.
|
|
ACTOR static Future<BTreePageIDRef> updateBTreePage(VersionedBTree* self, BTreePageIDRef oldID, Arena* arena,
|
|
Reference<IPage> page, Version writeVersion) {
|
|
state BTreePageIDRef newID;
|
|
newID.resize(*arena, oldID.size());
|
|
|
|
if (oldID.size() == 1) {
|
|
LogicalPageID id = wait(self->m_pager->atomicUpdatePage(oldID.front(), page, writeVersion));
|
|
newID.front() = id;
|
|
} else {
|
|
state std::vector<Reference<IPage>> pages;
|
|
const uint8_t* rptr = page->begin();
|
|
int bytesLeft = page->size();
|
|
while (bytesLeft > 0) {
|
|
Reference<IPage> p = self->m_pager->newPageBuffer();
|
|
int blockSize = p->size();
|
|
memcpy(p->mutate(), rptr, blockSize);
|
|
rptr += blockSize;
|
|
bytesLeft -= blockSize;
|
|
pages.push_back(p);
|
|
}
|
|
ASSERT(pages.size() == oldID.size());
|
|
|
|
// Write pages, trying to reuse original page IDs
|
|
state int i = 0;
|
|
for (; i < pages.size(); ++i) {
|
|
LogicalPageID id = wait(self->m_pager->atomicUpdatePage(oldID[i], pages[i], writeVersion));
|
|
newID[i] = id;
|
|
}
|
|
}
|
|
|
|
return newID;
|
|
}
|
|
|
|
// Copy page and initialize a Mirror for reading it.
|
|
Reference<IPage> cloneForUpdate(Reference<const IPage> page) {
|
|
Reference<IPage> newPage = page->clone();
|
|
|
|
auto oldMirror = (const BTreePage::BinaryTree::Mirror*)page->userData;
|
|
auto newBTPage = (BTreePage*)newPage->mutate();
|
|
|
|
newPage->userData =
|
|
new BTreePage::BinaryTree::Mirror(&newBTPage->tree(), oldMirror->lowerBound(), oldMirror->upperBound());
|
|
newPage->userDataDestructor = [](void* ptr) { delete (BTreePage::BinaryTree::Mirror*)ptr; };
|
|
return newPage;
|
|
}
|
|
|
|
// Each call to commitSubtree() will pass most of its arguments via a this structure because the caller
|
|
// will need access to these parameters after commitSubtree() is done.
|
|
struct InternalPageSliceUpdate {
|
|
// The logical range for the subtree's contents. Due to subtree clears, these boundaries may not match
|
|
// the lower/upper bounds needed to decode the page.
|
|
// Subtree clears can cause the boundaries for decoding the page to be more restrictive than the subtree's
|
|
// logical boundaries. When a subtree is fully cleared, the link to it is replaced with a null link, but
|
|
// the key boundary remains in tact to support decoding of the previous subtree.
|
|
const RedwoodRecordRef* subtreeLowerBound;
|
|
const RedwoodRecordRef* subtreeUpperBound;
|
|
|
|
// The lower/upper bound for decoding the root of the subtree
|
|
const RedwoodRecordRef* decodeLowerBound;
|
|
const RedwoodRecordRef* decodeUpperBound;
|
|
|
|
bool boundariesNormal() const {
|
|
// If the decode upper boundary is the subtree upper boundary the pointers will be the same
|
|
// For the lower boundary, if the pointers are not the same there is still a possibility
|
|
// that the keys are the same. This happens for the first remaining subtree of an internal page
|
|
// after the prior subtree(s) were cleared.
|
|
return (decodeUpperBound == subtreeUpperBound) &&
|
|
(decodeLowerBound == subtreeLowerBound || decodeLowerBound->sameExceptValue(*subtreeLowerBound));
|
|
}
|
|
|
|
// The record range of the subtree slice is cBegin to cEnd
|
|
// cBegin.get().getChildPage() is guaranteed to be valid
|
|
// cEnd can be
|
|
// - the next record which also has a child page
|
|
// - the next-next record which has a child page because the next record does not and
|
|
// only existed to provide the correct upper bound for decoding cBegin's child page
|
|
// - a later record with a valid child page, because this slice represents a range of
|
|
// multiple subtrees that are either all unchanged or all cleared.
|
|
// - invalid, because cBegin is the last child entry in the page or because the range
|
|
// being cleared or unchanged extends to the end of the page's entries
|
|
BTreePage::BinaryTree::Cursor cBegin;
|
|
BTreePage::BinaryTree::Cursor cEnd;
|
|
|
|
// The prefix length common to the entire logical subtree. Might be shorter than the length common to all
|
|
// actual items in the page.
|
|
int skipLen;
|
|
|
|
// Members below this point are "output" members, set by function calls from commitSubtree() once it decides
|
|
// what is happening with this slice of the tree.
|
|
|
|
// If true, present, the contents of newLinks should replace [cBegin, cEnd)
|
|
bool childrenChanged;
|
|
Standalone<VectorRef<RedwoodRecordRef>> newLinks;
|
|
|
|
// The upper boundary expected, if any, by the last child in either [cBegin, cEnd) or newLinks
|
|
// If the last record in the range has a null link then this will be null.
|
|
const RedwoodRecordRef* expectedUpperBound;
|
|
|
|
bool inPlaceUpdate;
|
|
|
|
// CommitSubtree will call one of the following three functions based on its exit path
|
|
|
|
// Subtree was cleared.
|
|
void cleared() {
|
|
inPlaceUpdate = false;
|
|
childrenChanged = true;
|
|
expectedUpperBound = nullptr;
|
|
}
|
|
|
|
// Page was updated in-place through edits and written to maybeNewID
|
|
void updatedInPlace(BTreePageIDRef maybeNewID, BTreePage* btPage, int capacity) {
|
|
inPlaceUpdate = true;
|
|
auto& metrics = g_redwoodMetrics.level(btPage->height);
|
|
metrics.pageModify += 1;
|
|
metrics.pageModifyExt += (maybeNewID.size() - 1);
|
|
metrics.modifyFillPct += (double)btPage->size() / capacity;
|
|
metrics.modifyStoredPct += (double)btPage->kvBytes / capacity;
|
|
metrics.modifyItemCount += btPage->tree().numItems;
|
|
|
|
// The boundaries can't have changed, but the child page link may have.
|
|
if (maybeNewID != decodeLowerBound->getChildPage()) {
|
|
// Add page's decode lower bound to newLinks set without its child page, intially
|
|
newLinks.push_back_deep(newLinks.arena(), decodeLowerBound->withoutValue());
|
|
|
|
// Set the child page ID, which has already been allocated in result.arena()
|
|
newLinks.back().setChildPage(maybeNewID);
|
|
childrenChanged = true;
|
|
} else {
|
|
childrenChanged = false;
|
|
}
|
|
|
|
// Expected upper bound remains unchanged.
|
|
}
|
|
|
|
// writePages() was used to build 1 or more replacement pages.
|
|
void rebuilt(Standalone<VectorRef<RedwoodRecordRef>> newRecords) {
|
|
inPlaceUpdate = false;
|
|
newLinks = newRecords;
|
|
childrenChanged = true;
|
|
|
|
// If the replacement records ended on a non-null child page, then the expect upper bound is
|
|
// the subtree upper bound since that is what would have been used for the page(s) rebuild,
|
|
// otherwise it is null.
|
|
expectedUpperBound = newLinks.back().value.present() ? subtreeUpperBound : nullptr;
|
|
}
|
|
|
|
// Get the first record for this range AFTER applying whatever changes were made
|
|
const RedwoodRecordRef* getFirstBoundary() const {
|
|
if (childrenChanged) {
|
|
if (newLinks.empty()) {
|
|
return nullptr;
|
|
}
|
|
return &newLinks.front();
|
|
}
|
|
return decodeLowerBound;
|
|
}
|
|
|
|
std::string toString() const {
|
|
std::string s;
|
|
s += format("SubtreeSlice: addr=%p skipLen=%d subtreeCleared=%d childrenChanged=%d\n", this, skipLen,
|
|
childrenChanged && newLinks.empty(), childrenChanged);
|
|
s += format("SubtreeLower: %s\n", subtreeLowerBound->toString(false).c_str());
|
|
s += format(" DecodeLower: %s\n", decodeLowerBound->toString(false).c_str());
|
|
s += format(" DecodeUpper: %s\n", decodeUpperBound->toString(false).c_str());
|
|
s += format("SubtreeUpper: %s\n", subtreeUpperBound->toString(false).c_str());
|
|
s += format("expectedUpperBound: %s\n",
|
|
expectedUpperBound ? expectedUpperBound->toString(false).c_str() : "(null)");
|
|
for (int i = 0; i < newLinks.size(); ++i) {
|
|
s += format(" %i: %s\n", i, newLinks[i].toString(false).c_str());
|
|
}
|
|
s.resize(s.size() - 1);
|
|
return s;
|
|
}
|
|
};
|
|
|
|
struct InternalPageModifier {
|
|
InternalPageModifier() {}
|
|
InternalPageModifier(BTreePage* p, BTreePage::BinaryTree::Mirror* m, bool updating, ParentInfo *parentInfo)
|
|
: btPage(p), m(m), updating(updating), changesMade(false), parentInfo(parentInfo) {}
|
|
|
|
bool updating;
|
|
BTreePage* btPage;
|
|
BTreePage::BinaryTree::Mirror* m;
|
|
Standalone<VectorRef<RedwoodRecordRef>> rebuild;
|
|
bool changesMade;
|
|
ParentInfo *parentInfo;
|
|
|
|
bool empty() const {
|
|
if (updating) {
|
|
return m->tree->numItems == 0;
|
|
} else {
|
|
return rebuild.empty();
|
|
}
|
|
}
|
|
|
|
// end is the cursor position of the first record of the unvisited child link range, which
|
|
// is needed if the insert requires switching from update to rebuild mode.
|
|
void insert(BTreePage::BinaryTree::Cursor end, const VectorRef<RedwoodRecordRef>& recs) {
|
|
int i = 0;
|
|
if (updating) {
|
|
// TODO: insert recs in a random order to avoid new subtree being entirely right child links
|
|
while (i != recs.size()) {
|
|
const RedwoodRecordRef& rec = recs[i];
|
|
debug_printf("internal page (updating) insert: %s\n", rec.toString(false).c_str());
|
|
|
|
if (!m->insert(rec)) {
|
|
debug_printf("internal page: failed to insert %s, switching to rebuild\n",
|
|
rec.toString(false).c_str());
|
|
// Update failed, so populate rebuild vector with everything up to but not including end, which
|
|
// may include items from recs that were already added.
|
|
auto c = end;
|
|
if (c.moveFirst()) {
|
|
rebuild.reserve(rebuild.arena(), c.mirror->tree->numItems);
|
|
while (c != end) {
|
|
debug_printf(" internal page rebuild: add %s\n", c.get().toString(false).c_str());
|
|
rebuild.push_back(rebuild.arena(), c.get());
|
|
c.moveNext();
|
|
}
|
|
}
|
|
updating = false;
|
|
break;
|
|
}
|
|
btPage->kvBytes += rec.kvBytes();
|
|
++i;
|
|
}
|
|
}
|
|
|
|
// Not updating existing page so just add recs to rebuild vector
|
|
if (!updating) {
|
|
rebuild.reserve(rebuild.arena(), rebuild.size() + recs.size());
|
|
while (i != recs.size()) {
|
|
const RedwoodRecordRef& rec = recs[i];
|
|
debug_printf("internal page (rebuilding) insert: %s\n", rec.toString(false).c_str());
|
|
rebuild.push_back(rebuild.arena(), rec);
|
|
++i;
|
|
}
|
|
}
|
|
}
|
|
|
|
void keep(BTreePage::BinaryTree::Cursor begin, BTreePage::BinaryTree::Cursor end) {
|
|
if (!updating) {
|
|
while (begin != end) {
|
|
debug_printf("internal page (rebuilding) keeping: %s\n", begin.get().toString(false).c_str());
|
|
rebuild.push_back(rebuild.arena(), begin.get());
|
|
begin.moveNext();
|
|
}
|
|
} else if (REDWOOD_DEBUG) {
|
|
while (begin != end) {
|
|
debug_printf("internal page (updating) keeping: %s\n", begin.get().toString(false).c_str());
|
|
begin.moveNext();
|
|
}
|
|
}
|
|
}
|
|
|
|
// This must be called for each of the InternalPageSliceUpdates in sorted order.
|
|
void applyUpdate(InternalPageSliceUpdate& u, const RedwoodRecordRef* nextBoundary) {
|
|
debug_printf("applyUpdate nextBoundary=(%p) %s %s\n", nextBoundary,
|
|
(nextBoundary != nullptr) ? nextBoundary->toString(false).c_str() : "", u.toString().c_str());
|
|
|
|
// If the children changed, replace [cBegin, cEnd) with newLinks
|
|
if (u.childrenChanged) {
|
|
if (updating) {
|
|
auto c = u.cBegin;
|
|
while (c != u.cEnd) {
|
|
debug_printf("internal page (updating) erasing: %s\n", c.get().toString(false).c_str());
|
|
btPage->kvBytes -= c.get().kvBytes();
|
|
c.erase();
|
|
}
|
|
// [cBegin, cEnd) is now erased, and cBegin is invalid, so cEnd represents the end
|
|
// of the range that comes before any part of newLinks that can't be added if there
|
|
// is not enough space.
|
|
insert(u.cEnd, u.newLinks);
|
|
} else {
|
|
// Already in rebuild mode so the cursor parameter is meaningless
|
|
insert({}, u.newLinks);
|
|
}
|
|
|
|
// cBegin has been erased so interating from the first entry forward will never see cBegin to use as an
|
|
// endpoint.
|
|
changesMade = true;
|
|
} else {
|
|
|
|
if(u.inPlaceUpdate) {
|
|
for(auto id : u.decodeLowerBound->getChildPage()) {
|
|
parentInfo->pageUpdated(id);
|
|
}
|
|
}
|
|
|
|
keep(u.cBegin, u.cEnd);
|
|
}
|
|
|
|
// If there is an expected upper boundary for the next range after u
|
|
if (u.expectedUpperBound != nullptr) {
|
|
// Then if it does not match the next boundary then insert a dummy record
|
|
if (nextBoundary == nullptr ||
|
|
(nextBoundary != u.expectedUpperBound && !nextBoundary->sameExceptValue(*u.expectedUpperBound))) {
|
|
RedwoodRecordRef rec = u.expectedUpperBound->withoutValue();
|
|
debug_printf("applyUpdate adding dummy record %s\n", rec.toString(false).c_str());
|
|
insert(u.cEnd, { &rec, 1 });
|
|
changesMade = true;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
ACTOR static Future<Void> commitSubtree(
|
|
VersionedBTree* self, Reference<IPagerSnapshot> snapshot, MutationBuffer* mutationBuffer, BTreePageIDRef rootID,
|
|
bool isLeaf,
|
|
MutationBuffer::const_iterator mBegin, // greatest mutation boundary <= subtreeLowerBound->key
|
|
MutationBuffer::const_iterator mEnd, // least boundary >= subtreeUpperBound->key
|
|
InternalPageSliceUpdate* update) {
|
|
|
|
state std::string context;
|
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if (REDWOOD_DEBUG) {
|
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context = format("CommitSubtree(root=%s): ", toString(rootID).c_str());
|
|
}
|
|
debug_printf("%s %s\n", context.c_str(), update->toString().c_str());
|
|
if (REDWOOD_DEBUG) {
|
|
debug_printf("%s ---------MUTATION BUFFER SLICE ---------------------\n", context.c_str());
|
|
auto begin = mBegin;
|
|
while (1) {
|
|
debug_printf("%s Mutation: '%s': %s\n", context.c_str(), printable(begin.key()).c_str(),
|
|
begin.mutation().toString().c_str());
|
|
if (begin == mEnd) {
|
|
break;
|
|
}
|
|
++begin;
|
|
}
|
|
debug_printf("%s -------------------------------------\n", context.c_str());
|
|
}
|
|
|
|
state Version writeVersion = self->getLastCommittedVersion() + 1;
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|
|
|
state Reference<FlowLock> commitReadLock = self->m_commitReadLock;
|
|
wait(commitReadLock->take());
|
|
state FlowLock::Releaser readLock(*commitReadLock);
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|
state Reference<const IPage> page =
|
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wait(readPage(snapshot, rootID, update->decodeLowerBound, update->decodeUpperBound));
|
|
readLock.release();
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|
|
|
state BTreePage* btPage = (BTreePage*)page->begin();
|
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ASSERT(isLeaf == btPage->isLeaf());
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g_redwoodMetrics.level(btPage->height).pageCommitStart += 1;
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|
|
|
// TODO: Decide if it is okay to update if the subtree boundaries are expanded. It can result in
|
|
// records in a DeltaTree being outside its decode boundary range, which isn't actually invalid
|
|
// though it is awkward to reason about.
|
|
state bool tryToUpdate = btPage->tree().numItems > 0 && update->boundariesNormal();
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|
|
|
// If trying to update the page, we need to clone it so we don't modify the original.
|
|
// TODO: Refactor DeltaTree::Mirror so it can be shared between different versions of pages
|
|
if (tryToUpdate) {
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|
page = self->cloneForUpdate(page);
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btPage = (BTreePage*)page->begin();
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|
}
|
|
|
|
debug_printf(
|
|
"%s commitSubtree(): %s\n", context.c_str(),
|
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btPage->toString(false, rootID, snapshot->getVersion(), update->decodeLowerBound, update->decodeUpperBound)
|
|
.c_str());
|
|
|
|
state BTreePage::BinaryTree::Cursor cursor = getCursor(page);
|
|
|
|
if (REDWOOD_DEBUG) {
|
|
debug_printf("%s ---------MUTATION BUFFER SLICE ---------------------\n", context.c_str());
|
|
auto begin = mBegin;
|
|
while (1) {
|
|
debug_printf("%s Mutation: '%s': %s\n", context.c_str(), printable(begin.key()).c_str(),
|
|
begin.mutation().toString().c_str());
|
|
if (begin == mEnd) {
|
|
break;
|
|
}
|
|
++begin;
|
|
}
|
|
debug_printf("%s -------------------------------------\n", context.c_str());
|
|
}
|
|
|
|
// Leaf Page
|
|
if (isLeaf) {
|
|
bool updating = tryToUpdate;
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|
bool changesMade = false;
|
|
|
|
// Couldn't make changes in place, so now do a linear merge and build new pages.
|
|
state Standalone<VectorRef<RedwoodRecordRef>> merged;
|
|
|
|
auto switchToLinearMerge = [&]() {
|
|
updating = false;
|
|
auto c = cursor;
|
|
c.moveFirst();
|
|
while (c != cursor) {
|
|
debug_printf("%s catch-up adding %s\n", context.c_str(), c.get().toString().c_str());
|
|
merged.push_back(merged.arena(), c.get());
|
|
c.moveNext();
|
|
}
|
|
};
|
|
|
|
// The first mutation buffer boundary has a key <= the first key in the page.
|
|
|
|
cursor.moveFirst();
|
|
debug_printf("%s Leaf page, applying changes.\n", context.c_str());
|
|
|
|
// Now, process each mutation range and merge changes with existing data.
|
|
bool firstMutationBoundary = true;
|
|
while (mBegin != mEnd) {
|
|
debug_printf("%s New mutation boundary: '%s': %s\n", context.c_str(), printable(mBegin.key()).c_str(),
|
|
mBegin.mutation().toString().c_str());
|
|
|
|
// Apply the change to the mutation buffer start boundary key only if
|
|
// - there actually is a change (whether a set or a clear, old records are to be removed)
|
|
// - either this is not the first boundary or it is but its key matches our lower bound key
|
|
bool applyBoundaryChange = mBegin.mutation().boundaryChanged &&
|
|
(!firstMutationBoundary || mBegin.key() == update->subtreeLowerBound->key);
|
|
firstMutationBoundary = false;
|
|
|
|
// Iterate over records for the mutation boundary key, keep them unless the boundary key was changed or
|
|
// we are not applying it
|
|
while (cursor.valid() && cursor.get().key == mBegin.key()) {
|
|
// If there were no changes to the key or we're not applying it
|
|
if (!applyBoundaryChange) {
|
|
// If not updating, add to the output set, otherwise skip ahead past the records for the
|
|
// mutation boundary
|
|
if (!updating) {
|
|
merged.push_back(merged.arena(), cursor.get());
|
|
debug_printf("%s Added %s [existing, boundary start]\n", context.c_str(),
|
|
cursor.get().toString().c_str());
|
|
}
|
|
cursor.moveNext();
|
|
} else {
|
|
changesMade = true;
|
|
// If updating, erase from the page, otherwise do not add to the output set
|
|
if (updating) {
|
|
debug_printf("%s Erasing %s [existing, boundary start]\n", context.c_str(),
|
|
cursor.get().toString().c_str());
|
|
btPage->kvBytes -= cursor.get().kvBytes();
|
|
cursor.erase();
|
|
} else {
|
|
debug_printf("%s Skipped %s [existing, boundary start]\n", context.c_str(),
|
|
cursor.get().toString().c_str());
|
|
cursor.moveNext();
|
|
}
|
|
}
|
|
}
|
|
|
|
constexpr int maxHeightAllowed = 8;
|
|
|
|
// Write the new record(s) for the mutation boundary start key if its value has been set
|
|
// Clears of this key will have been processed above by not being erased from the updated page or
|
|
// excluded from the merge output
|
|
if (applyBoundaryChange && mBegin.mutation().boundarySet()) {
|
|
RedwoodRecordRef rec(mBegin.key(), 0, mBegin.mutation().boundaryValue.get());
|
|
changesMade = true;
|
|
|
|
// If updating, add to the page, else add to the output set
|
|
if (updating) {
|
|
if (cursor.mirror->insert(rec, update->skipLen, maxHeightAllowed)) {
|
|
btPage->kvBytes += rec.kvBytes();
|
|
debug_printf("%s Inserted %s [mutation, boundary start]\n", context.c_str(),
|
|
rec.toString().c_str());
|
|
} else {
|
|
debug_printf("%s Insert failed for %s [mutation, boundary start]\n", context.c_str(),
|
|
rec.toString().c_str());
|
|
switchToLinearMerge();
|
|
}
|
|
}
|
|
|
|
if (!updating) {
|
|
merged.push_back(merged.arena(), rec);
|
|
debug_printf("%s Added %s [mutation, boundary start]\n", context.c_str(),
|
|
rec.toString().c_str());
|
|
}
|
|
}
|
|
|
|
// Before advancing the iterator, get whether or not the records in the following range must be removed
|
|
bool remove = mBegin.mutation().clearAfterBoundary;
|
|
// Advance to the next boundary because we need to know the end key for the current range.
|
|
++mBegin;
|
|
if (mBegin == mEnd) {
|
|
update->skipLen = 0;
|
|
}
|
|
|
|
debug_printf("%s Mutation range end: '%s'\n", context.c_str(), printable(mBegin.key()).c_str());
|
|
|
|
// Now handle the records up through but not including the next mutation boundary key
|
|
RedwoodRecordRef end(mBegin.key());
|
|
|
|
// If the records are being removed and we're not doing an in-place update
|
|
// OR if we ARE doing an update but the records are NOT being removed, then just skip them.
|
|
if (remove != updating) {
|
|
// If not updating, then the records, if any exist, are being removed. We don't know if there
|
|
// actually are any but we must assume there are.
|
|
if (!updating) {
|
|
changesMade = true;
|
|
}
|
|
|
|
debug_printf("%s Seeking forward to next boundary (remove=%d updating=%d) %s\n", context.c_str(),
|
|
remove, updating, mBegin.key().toString().c_str());
|
|
cursor.seekGreaterThanOrEqual(end, update->skipLen);
|
|
} else {
|
|
// Otherwise we must visit the records. If updating, the visit is to erase them, and if doing a
|
|
// linear merge than the visit is to add them to the output set.
|
|
while (cursor.valid() && cursor.get().compare(end, update->skipLen) < 0) {
|
|
if (updating) {
|
|
debug_printf("%s Erasing %s [existing, boundary start]\n", context.c_str(),
|
|
cursor.get().toString().c_str());
|
|
btPage->kvBytes -= cursor.get().kvBytes();
|
|
cursor.erase();
|
|
changesMade = true;
|
|
} else {
|
|
merged.push_back(merged.arena(), cursor.get());
|
|
debug_printf("%s Added %s [existing, middle]\n", context.c_str(),
|
|
merged.back().toString().c_str());
|
|
cursor.moveNext();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If there are still more records, they have the same key as the end boundary
|
|
if (cursor.valid()) {
|
|
// If the end boundary is changing, we must remove the remaining records in this page
|
|
bool remove = mEnd.mutation().boundaryChanged;
|
|
if (remove) {
|
|
changesMade = true;
|
|
}
|
|
|
|
// If we don't have to remove the records and we are updating, do nothing.
|
|
// If we do have to remove the records and we are not updating, do nothing.
|
|
if (remove != updating) {
|
|
debug_printf("%s Ignoring remaining records, remove=%d updating=%d\n", context.c_str(), remove,
|
|
updating);
|
|
} else {
|
|
// If updating and the key is changing, we must visit the records to erase them.
|
|
// If not updating and the key is not changing, we must visit the records to add them to the output
|
|
// set.
|
|
while (cursor.valid()) {
|
|
if (updating) {
|
|
debug_printf(
|
|
"%s Erasing %s and beyond [existing, matches changed upper mutation boundary]\n",
|
|
context.c_str(), cursor.get().toString().c_str());
|
|
btPage->kvBytes -= cursor.get().kvBytes();
|
|
cursor.erase();
|
|
} else {
|
|
merged.push_back(merged.arena(), cursor.get());
|
|
debug_printf("%s Added %s [existing, tail]\n", context.c_str(),
|
|
merged.back().toString().c_str());
|
|
cursor.moveNext();
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
debug_printf("%s No records matching mutation buffer end boundary key\n", context.c_str());
|
|
}
|
|
|
|
// No changes were actually made. This could happen if the only mutations are clear ranges which do not
|
|
// match any records.
|
|
if (!changesMade) {
|
|
debug_printf("%s No changes were made during mutation merge, returning %s\n", context.c_str(),
|
|
toString(*update).c_str());
|
|
return Void();
|
|
} else {
|
|
debug_printf(
|
|
"%s Changes were made, writing, but subtree may still be unchanged from parent's perspective.\n",
|
|
context.c_str());
|
|
}
|
|
|
|
writeVersion = self->getLastCommittedVersion() + 1;
|
|
|
|
if (updating) {
|
|
const BTreePage::BinaryTree& deltaTree = btPage->tree();
|
|
// If the tree is now empty, delete the page
|
|
if (deltaTree.numItems == 0) {
|
|
update->cleared();
|
|
self->freeBTreePage(rootID, writeVersion);
|
|
debug_printf("%s Page updates cleared all entries, returning %s\n", context.c_str(),
|
|
toString(*update).c_str());
|
|
} else {
|
|
// Otherwise update it.
|
|
BTreePageIDRef newID = wait(self->updateBTreePage(self, rootID, &update->newLinks.arena(),
|
|
page.castTo<IPage>(), writeVersion));
|
|
|
|
update->updatedInPlace(newID, btPage, newID.size() * self->m_blockSize);
|
|
debug_printf("%s Page updated in-place, returning %s\n", context.c_str(),
|
|
toString(*update).c_str());
|
|
}
|
|
return Void();
|
|
}
|
|
|
|
// If everything in the page was deleted then this page should be deleted as of the new version
|
|
if (merged.empty()) {
|
|
update->cleared();
|
|
self->freeBTreePage(rootID, writeVersion);
|
|
|
|
debug_printf("%s All leaf page contents were cleared, returning %s\n", context.c_str(),
|
|
toString(*update).c_str());
|
|
return Void();
|
|
}
|
|
|
|
// Rebuild new page(s).
|
|
state Standalone<VectorRef<RedwoodRecordRef>> entries =
|
|
wait(writePages(self, update->subtreeLowerBound, update->subtreeUpperBound, merged, btPage->height,
|
|
writeVersion, rootID));
|
|
|
|
// Put new links into update and tell update that pages were rebuilt
|
|
update->rebuilt(entries);
|
|
|
|
debug_printf("%s Merge complete, returning %s\n", context.c_str(), toString(*update).c_str());
|
|
return Void();
|
|
} else {
|
|
// Internal Page
|
|
std::vector<Future<Void>> recursions;
|
|
state std::vector<InternalPageSliceUpdate*> slices;
|
|
state Arena arena;
|
|
|
|
cursor.moveFirst();
|
|
|
|
bool first = true;
|
|
|
|
while (cursor.valid()) {
|
|
InternalPageSliceUpdate& u = *new (arena) InternalPageSliceUpdate();
|
|
slices.push_back(&u);
|
|
|
|
// At this point we should never be at a null child page entry because the first entry of a page
|
|
// can't be null and this loop will skip over null entries that come after non-null entries.
|
|
ASSERT(cursor.get().value.present());
|
|
|
|
// Subtree lower boundary is this page's subtree lower bound or cursor
|
|
u.cBegin = cursor;
|
|
u.decodeLowerBound = &cursor.get();
|
|
if (first) {
|
|
u.subtreeLowerBound = update->subtreeLowerBound;
|
|
first = false;
|
|
// mbegin is already the first mutation that could affect this subtree described by update
|
|
} else {
|
|
u.subtreeLowerBound = u.decodeLowerBound;
|
|
mBegin = mEnd;
|
|
// mBegin is either at or greater than subtreeLowerBound->key, which was the subtreeUpperBound->key
|
|
// for the previous subtree slice. But we need it to be at or *before* subtreeLowerBound->key
|
|
// so if mBegin.key() is not exactly the subtree lower bound key then decrement it.
|
|
if (mBegin.key() != u.subtreeLowerBound->key) {
|
|
--mBegin;
|
|
}
|
|
}
|
|
|
|
BTreePageIDRef pageID = cursor.get().getChildPage();
|
|
ASSERT(!pageID.empty());
|
|
|
|
// The decode upper bound is always the next key after the child link, or the decode upper bound for
|
|
// this page
|
|
if (cursor.moveNext()) {
|
|
u.decodeUpperBound = &cursor.get();
|
|
// If cursor record has a null child page then it exists only to preserve a previous
|
|
// subtree boundary that is now needed for reading the subtree at cBegin.
|
|
if (!cursor.get().value.present()) {
|
|
// If the upper bound is provided by a dummy record in [cBegin, cEnd) then there is no
|
|
// requirement on the next subtree range or the parent page to have a specific upper boundary
|
|
// for decoding the subtree.
|
|
u.expectedUpperBound = nullptr;
|
|
cursor.moveNext();
|
|
// If there is another record after the null child record, it must have a child page value
|
|
ASSERT(!cursor.valid() || cursor.get().value.present());
|
|
} else {
|
|
u.expectedUpperBound = u.decodeUpperBound;
|
|
}
|
|
} else {
|
|
u.decodeUpperBound = update->decodeUpperBound;
|
|
u.expectedUpperBound = update->decodeUpperBound;
|
|
}
|
|
u.subtreeUpperBound = cursor.valid() ? &cursor.get() : update->subtreeUpperBound;
|
|
u.cEnd = cursor;
|
|
u.skipLen = 0; // TODO: set this
|
|
|
|
// Find the mutation buffer range that includes all changes to the range described by u
|
|
mEnd = mutationBuffer->lower_bound(u.subtreeUpperBound->key);
|
|
|
|
// If the mutation range described by mBegin extends to mEnd, then see if the part of that range
|
|
// that overlaps with u's subtree range is being fully cleared or fully unchanged.
|
|
auto next = mBegin;
|
|
++next;
|
|
if (next == mEnd) {
|
|
// Check for uniform clearedness or unchangedness for the range mutation where it overlaps u's
|
|
// subtree
|
|
const KeyRef& mutationBoundaryKey = mBegin.key();
|
|
const RangeMutation& range = mBegin.mutation();
|
|
bool uniform;
|
|
if (range.clearAfterBoundary) {
|
|
// If the mutation range after the boundary key is cleared, then the mutation boundary key must
|
|
// be cleared or must be different than the subtree lower bound key so that it doesn't matter
|
|
uniform = range.boundaryCleared() || mutationBoundaryKey != u.subtreeLowerBound->key;
|
|
} else {
|
|
// If the mutation range after the boundary key is unchanged, then the mutation boundary key
|
|
// must be also unchanged or must be different than the subtree lower bound key so that it
|
|
// doesn't matter
|
|
uniform = !range.boundaryChanged || mutationBoundaryKey != u.subtreeLowerBound->key;
|
|
}
|
|
|
|
// If u's subtree is either all cleared or all unchanged
|
|
if (uniform) {
|
|
// We do not need to recurse to this subtree. Next, let's see if we can embiggen u's range to
|
|
// include sibling subtrees also covered by (mBegin, mEnd) so we can not recurse to those, too.
|
|
// If the cursor is valid, u.subtreeUpperBound is the cursor's position, which is >= mEnd.key().
|
|
// If equal, no range expansion is possible.
|
|
if (cursor.valid() && mEnd.key() != u.subtreeUpperBound->key) {
|
|
cursor.seekLessThanOrEqual(mEnd.key(), update->skipLen, &cursor, 1);
|
|
|
|
// If this seek moved us ahead, to something other than cEnd, then update subtree range
|
|
// boundaries
|
|
if (cursor != u.cEnd) {
|
|
// If the cursor is at a record with a null child, back up one step because it is in the
|
|
// middle of the next logical subtree, as null child records are not subtree boundaries.
|
|
ASSERT(cursor.valid());
|
|
if (!cursor.get().value.present()) {
|
|
cursor.movePrev();
|
|
}
|
|
|
|
u.cEnd = cursor;
|
|
u.subtreeUpperBound = &cursor.get();
|
|
u.skipLen = 0; // TODO: set this
|
|
|
|
// The new decode upper bound is either cEnd or the record before it if it has no child
|
|
// link
|
|
auto c = u.cEnd;
|
|
c.movePrev();
|
|
ASSERT(c.valid());
|
|
if (!c.get().value.present()) {
|
|
u.decodeUpperBound = &c.get();
|
|
u.expectedUpperBound = nullptr;
|
|
} else {
|
|
u.decodeUpperBound = u.subtreeUpperBound;
|
|
u.expectedUpperBound = u.subtreeUpperBound;
|
|
}
|
|
}
|
|
}
|
|
|
|
// The subtree range is either fully cleared or unchanged.
|
|
if (range.clearAfterBoundary) {
|
|
// Cleared
|
|
u.cleared();
|
|
auto c = u.cBegin;
|
|
while (c != u.cEnd) {
|
|
const RedwoodRecordRef& rec = c.get();
|
|
if (rec.value.present()) {
|
|
if (btPage->height == 2) {
|
|
debug_printf("%s: freeing child page in cleared subtree range: %s\n",
|
|
context.c_str(), ::toString(rec.getChildPage()).c_str());
|
|
self->freeBTreePage(rec.getChildPage(), writeVersion);
|
|
} else {
|
|
debug_printf("%s: queuing subtree deletion cleared subtree range: %s\n",
|
|
context.c_str(), ::toString(rec.getChildPage()).c_str());
|
|
self->m_lazyClearQueue.pushFront(
|
|
LazyClearQueueEntry{ writeVersion, rec.getChildPage() });
|
|
}
|
|
}
|
|
c.moveNext();
|
|
}
|
|
} else {
|
|
// Subtree range unchanged
|
|
}
|
|
|
|
debug_printf("%s: MutationBuffer covers this range in a single mutation, not recursing: %s\n",
|
|
context.c_str(), u.toString().c_str());
|
|
|
|
// u has already been initialized with the correct result, no recursion needed, so restart the
|
|
// loop.
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// If this page has height of 2 then its children are leaf nodes
|
|
recursions.push_back(
|
|
self->commitSubtree(self, snapshot, mutationBuffer, pageID, btPage->height == 2, mBegin, mEnd, &u));
|
|
}
|
|
|
|
debug_printf(
|
|
"%s Recursions from internal page started. pageSize=%d level=%d children=%d slices=%d recursions=%d\n",
|
|
context.c_str(), btPage->size(), btPage->height, btPage->tree().numItems, slices.size(),
|
|
recursions.size());
|
|
|
|
wait(waitForAll(recursions));
|
|
debug_printf("%s Recursions done, processing slice updates.\n", context.c_str());
|
|
|
|
// Note: parentInfo could be invalid after a wait and must be re-initialized.
|
|
// All uses below occur before waits so no reinitialization is done.
|
|
state ParentInfo *parentInfo = &self->childUpdateTracker[rootID.front()];
|
|
state InternalPageModifier m(btPage, cursor.mirror, tryToUpdate, parentInfo);
|
|
|
|
// Apply the possible changes for each subtree range recursed to, except the last one.
|
|
// For each range, the expected next record, if any, is checked against the first boundary
|
|
// of the next range, if any.
|
|
for (int i = 0, iEnd = slices.size() - 1; i < iEnd; ++i) {
|
|
m.applyUpdate(*slices[i], slices[i + 1]->getFirstBoundary());
|
|
}
|
|
|
|
// The expected next record for the final range is checked against one of the upper boundaries passed to
|
|
// this commitSubtree() instance. If changes have already been made, then the subtree upper boundary is
|
|
// passed, so in the event a different upper boundary is needed it will be added to the already-modified
|
|
// page. Otherwise, the decode boundary is used which will prevent this page from being modified for the
|
|
// sole purpose of adding a dummy upper bound record.
|
|
debug_printf("%s Applying final child range update. changesMade=%d Parent update is: %s\n",
|
|
context.c_str(), m.changesMade, update->toString().c_str());
|
|
m.applyUpdate(*slices.back(), m.changesMade ? update->subtreeUpperBound : update->decodeUpperBound);
|
|
|
|
state bool detachChildren = (parentInfo->count > 2);
|
|
state bool forceUpdate = false;
|
|
|
|
if(!m.changesMade && detachChildren) {
|
|
debug_printf("%s Internal page forced rewrite because at least %d children have been updated in-place.\n", context.c_str(), parentInfo->count);
|
|
forceUpdate = true;
|
|
if(!m.updating) {
|
|
page = self->cloneForUpdate(page);
|
|
cursor = getCursor(page);
|
|
btPage = (BTreePage*)page->begin();
|
|
m.btPage = btPage;
|
|
m.m = cursor.mirror;
|
|
m.updating = true;
|
|
}
|
|
++g_redwoodMetrics.level(btPage->height).forceUpdate;
|
|
}
|
|
|
|
// If page contents have changed
|
|
if (m.changesMade || forceUpdate) {
|
|
if (m.empty()) {
|
|
update->cleared();
|
|
debug_printf("%s All internal page children were deleted so deleting this page too, returning %s\n",
|
|
context.c_str(), toString(*update).c_str());
|
|
self->freeBTreePage(rootID, writeVersion);
|
|
self->childUpdateTracker.erase(rootID.front());
|
|
} else {
|
|
if (m.updating) {
|
|
// Page was updated in place (or being forced to be updated in place to update child page ids)
|
|
debug_printf("%s Internal page modified in-place tryUpdate=%d forceUpdate=%d detachChildren=%d\n", context.c_str(), tryToUpdate, forceUpdate, detachChildren);
|
|
|
|
if(detachChildren) {
|
|
int detached = 0;
|
|
cursor.moveFirst();
|
|
auto &stats = g_redwoodMetrics.level(btPage->height);
|
|
while(cursor.valid()) {
|
|
if(cursor.get().value.present()) {
|
|
for(auto &p : cursor.get().getChildPage()) {
|
|
if(parentInfo->maybeUpdated(p)) {
|
|
LogicalPageID newID = self->m_pager->detachRemappedPage(p, writeVersion);
|
|
if(newID != invalidLogicalPageID) {
|
|
debug_printf("%s Detach updated %u -> %u\n", context.c_str(), p, newID);
|
|
p = newID;
|
|
++stats.detachChild;
|
|
++detached;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
cursor.moveNext();
|
|
}
|
|
parentInfo->clear();
|
|
if(forceUpdate && detached == 0) {
|
|
debug_printf("%s No children detached during forced update, returning %s\n", context.c_str(), toString(*update).c_str());
|
|
return Void();
|
|
}
|
|
}
|
|
|
|
BTreePageIDRef newID = wait(self->updateBTreePage(self, rootID, &update->newLinks.arena(),
|
|
page.castTo<IPage>(), writeVersion));
|
|
debug_printf(
|
|
"%s commitSubtree(): Internal page updated in-place at version %s, new contents: %s\n", context.c_str(), toString(writeVersion).c_str(),
|
|
btPage->toString(false, newID, snapshot->getVersion(), update->decodeLowerBound, update->decodeUpperBound)
|
|
.c_str());
|
|
|
|
update->updatedInPlace(newID, btPage, newID.size() * self->m_blockSize);
|
|
debug_printf("%s Internal page updated in-place, returning %s\n", context.c_str(),
|
|
toString(*update).c_str());
|
|
} else {
|
|
// Page was rebuilt, possibly split.
|
|
debug_printf("%s Internal page could not be modified, rebuilding replacement(s).\n", context.c_str());
|
|
|
|
if(detachChildren) {
|
|
auto &stats = g_redwoodMetrics.level(btPage->height);
|
|
for(auto &rec : m.rebuild) {
|
|
if(rec.value.present()) {
|
|
BTreePageIDRef oldPages = rec.getChildPage();
|
|
BTreePageIDRef newPages;
|
|
for(int i = 0; i < oldPages.size(); ++i) {
|
|
LogicalPageID p = oldPages[i];
|
|
if(parentInfo->maybeUpdated(p)) {
|
|
LogicalPageID newID = self->m_pager->detachRemappedPage(p, writeVersion);
|
|
if(newID != invalidLogicalPageID) {
|
|
// Rebuild record values reference original page memory so make a copy
|
|
if(newPages.empty()) {
|
|
newPages = BTreePageIDRef(m.rebuild.arena(), oldPages);
|
|
rec.setChildPage(newPages);
|
|
}
|
|
debug_printf("%s Detach updated %u -> %u\n", context.c_str(), p, newID);
|
|
newPages[i] = newID;
|
|
++stats.detachChild;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
parentInfo->clear();
|
|
}
|
|
|
|
Standalone<VectorRef<RedwoodRecordRef>> newChildEntries =
|
|
wait(writePages(self, update->subtreeLowerBound, update->subtreeUpperBound, m.rebuild,
|
|
btPage->height, writeVersion, rootID));
|
|
update->rebuilt(newChildEntries);
|
|
|
|
debug_printf("%s Internal page rebuilt, returning %s\n", context.c_str(),
|
|
toString(*update).c_str());
|
|
}
|
|
}
|
|
} else {
|
|
debug_printf("%s Page has no changes, returning %s\n", context.c_str(), toString(*update).c_str());
|
|
}
|
|
return Void();
|
|
}
|
|
}
|
|
|
|
ACTOR static Future<Void> commit_impl(VersionedBTree* self) {
|
|
state MutationBuffer* mutations = self->m_pBuffer;
|
|
|
|
// No more mutations are allowed to be written to this mutation buffer we will commit
|
|
// at m_writeVersion, which we must save locally because it could change during commit.
|
|
self->m_pBuffer = nullptr;
|
|
state Version writeVersion = self->m_writeVersion;
|
|
|
|
// The latest mutation buffer start version is the one we will now (or eventually) commit.
|
|
state Version mutationBufferStartVersion = self->m_mutationBuffers.rbegin()->first;
|
|
|
|
// Replace the lastCommit future with a new one and then wait on the old one
|
|
state Promise<Void> committed;
|
|
Future<Void> previousCommit = self->m_latestCommit;
|
|
self->m_latestCommit = committed.getFuture();
|
|
|
|
// Wait for the latest commit to be finished.
|
|
wait(previousCommit);
|
|
|
|
self->m_pager->setOldestVersion(self->m_newOldestVersion);
|
|
debug_printf("%s: Beginning commit of version %" PRId64 ", new oldest version set to %" PRId64 "\n",
|
|
self->m_name.c_str(), writeVersion, self->m_newOldestVersion);
|
|
|
|
// Get the latest version from the pager, which is what we will read at
|
|
state Version latestVersion = self->m_pager->getLatestVersion();
|
|
debug_printf("%s: pager latestVersion %" PRId64 "\n", self->m_name.c_str(), latestVersion);
|
|
|
|
state Standalone<BTreePageIDRef> rootPageID = self->m_header.root.get();
|
|
state InternalPageSliceUpdate all;
|
|
state RedwoodRecordRef rootLink = dbBegin.withPageID(rootPageID);
|
|
all.subtreeLowerBound = &rootLink;
|
|
all.decodeLowerBound = &rootLink;
|
|
all.subtreeUpperBound = &dbEnd;
|
|
all.decodeUpperBound = &dbEnd;
|
|
all.skipLen = 0;
|
|
|
|
MutationBuffer::const_iterator mBegin = mutations->upper_bound(all.subtreeLowerBound->key);
|
|
--mBegin;
|
|
MutationBuffer::const_iterator mEnd = mutations->lower_bound(all.subtreeUpperBound->key);
|
|
|
|
wait(commitSubtree(self, self->m_pager->getReadSnapshot(latestVersion), mutations, rootPageID,
|
|
self->m_header.height == 1, mBegin, mEnd, &all));
|
|
|
|
// If the old root was deleted, write a new empty tree root node and free the old roots
|
|
if (all.childrenChanged) {
|
|
if (all.newLinks.empty()) {
|
|
debug_printf("Writing new empty root.\n");
|
|
LogicalPageID newRootID = wait(self->m_pager->newPageID());
|
|
Reference<IPage> page = self->m_pager->newPageBuffer();
|
|
makeEmptyRoot(page);
|
|
self->m_header.height = 1;
|
|
self->m_pager->updatePage(newRootID, page);
|
|
rootPageID = BTreePageIDRef((LogicalPageID*)&newRootID, 1);
|
|
} else {
|
|
Standalone<VectorRef<RedwoodRecordRef>> newRootLevel(all.newLinks, all.newLinks.arena());
|
|
if (newRootLevel.size() == 1) {
|
|
rootPageID = newRootLevel.front().getChildPage();
|
|
} else {
|
|
// If the new root level's size is not 1 then build new root level(s)
|
|
Standalone<VectorRef<RedwoodRecordRef>> newRootPage =
|
|
wait(buildNewRoot(self, latestVersion, newRootLevel, self->m_header.height));
|
|
rootPageID = newRootPage.front().getChildPage();
|
|
}
|
|
}
|
|
}
|
|
|
|
self->m_header.root.set(rootPageID, sizeof(headerSpace) - sizeof(m_header));
|
|
|
|
self->m_lazyClearStop = true;
|
|
wait(success(self->m_lazyClearActor));
|
|
debug_printf("Lazy delete freed %u pages\n", self->m_lazyClearActor.get());
|
|
|
|
self->m_pager->setCommitVersion(writeVersion);
|
|
|
|
wait(self->m_lazyClearQueue.flush());
|
|
self->m_header.lazyDeleteQueue = self->m_lazyClearQueue.getState();
|
|
|
|
debug_printf("Setting metakey\n");
|
|
self->m_pager->setMetaKey(self->m_header.asKeyRef());
|
|
|
|
debug_printf("%s: Committing pager %" PRId64 "\n", self->m_name.c_str(), writeVersion);
|
|
wait(self->m_pager->commit());
|
|
debug_printf("%s: Committed version %" PRId64 "\n", self->m_name.c_str(), writeVersion);
|
|
|
|
// Now that everything is committed we must delete the mutation buffer.
|
|
// Our buffer's start version should be the oldest mutation buffer version in the map.
|
|
ASSERT(mutationBufferStartVersion == self->m_mutationBuffers.begin()->first);
|
|
self->m_mutationBuffers.erase(self->m_mutationBuffers.begin());
|
|
|
|
self->m_lastCommittedVersion = writeVersion;
|
|
++g_redwoodMetrics.opCommit;
|
|
self->m_lazyClearActor = incrementalLazyClear(self);
|
|
|
|
committed.send(Void());
|
|
return Void();
|
|
}
|
|
|
|
public:
|
|
// InternalCursor is for seeking to and iterating over the leaf-level RedwoodRecordRef records in the tree.
|
|
// The records could represent multiple values for the same key at different versions, including a non-present value
|
|
// representing a clear. Currently, however, all records are at version 0 and no clears are present in the tree.
|
|
struct InternalCursor {
|
|
private:
|
|
// Each InternalCursor's position is represented by a reference counted PageCursor, which links
|
|
// to its parent PageCursor, up to a PageCursor representing a cursor on the root page.
|
|
// PageCursors can be shared by many InternalCursors, making InternalCursor copying low overhead
|
|
struct PageCursor : ReferenceCounted<PageCursor>, FastAllocated<PageCursor> {
|
|
Reference<PageCursor> parent;
|
|
BTreePageIDRef pageID; // Only needed for debugging purposes
|
|
Reference<const IPage> page;
|
|
BTreePage::BinaryTree::Cursor cursor;
|
|
|
|
// id will normally reference memory owned by the parent, which is okay because a reference to the parent
|
|
// will be held in the cursor
|
|
PageCursor(BTreePageIDRef id, Reference<const IPage> page, Reference<PageCursor> parent = {})
|
|
: pageID(id), page(page), parent(parent), cursor(getCursor(page)) {}
|
|
|
|
PageCursor(const PageCursor& toCopy)
|
|
: parent(toCopy.parent), pageID(toCopy.pageID), page(toCopy.page), cursor(toCopy.cursor) {}
|
|
|
|
// Convenience method for copying a PageCursor
|
|
Reference<PageCursor> copy() const { return Reference<PageCursor>(new PageCursor(*this)); }
|
|
|
|
const BTreePage* btPage() const { return (const BTreePage*)page->begin(); }
|
|
|
|
bool isLeaf() const { return btPage()->isLeaf(); }
|
|
|
|
Future<Reference<PageCursor>> getChild(Reference<IPagerSnapshot> pager, int readAheadBytes = 0) {
|
|
ASSERT(!isLeaf());
|
|
BTreePage::BinaryTree::Cursor next = cursor;
|
|
next.moveNext();
|
|
const RedwoodRecordRef& rec = cursor.get();
|
|
BTreePageIDRef id = rec.getChildPage();
|
|
Future<Reference<const IPage>> child = readPage(pager, id, &rec, &next.getOrUpperBound());
|
|
|
|
// Read ahead siblings at level 2
|
|
// TODO: Application of readAheadBytes is not taking into account the size of the current page or any
|
|
// of the adjacent pages it is preloading.
|
|
if (readAheadBytes > 0 && btPage()->height == 2 && next.valid()) {
|
|
do {
|
|
debug_printf("preloading %s %d bytes left\n", ::toString(next.get().getChildPage()).c_str(),
|
|
readAheadBytes);
|
|
// If any part of the page was already loaded then stop
|
|
if (next.get().value.present()) {
|
|
preLoadPage(pager.getPtr(), next.get().getChildPage());
|
|
readAheadBytes -= page->size();
|
|
}
|
|
} while (readAheadBytes > 0 && next.moveNext());
|
|
}
|
|
|
|
return map(child, [=](Reference<const IPage> page) {
|
|
return Reference<PageCursor>(new PageCursor(id, page, Reference<PageCursor>::addRef(this)));
|
|
});
|
|
}
|
|
|
|
std::string toString() const {
|
|
return format("%s, %s", ::toString(pageID).c_str(),
|
|
cursor.valid() ? cursor.get().toString(isLeaf()).c_str() : "<invalid>");
|
|
}
|
|
};
|
|
|
|
Standalone<BTreePageIDRef> rootPageID;
|
|
Reference<IPagerSnapshot> pager;
|
|
Reference<PageCursor> pageCursor;
|
|
|
|
public:
|
|
InternalCursor() {}
|
|
|
|
InternalCursor(Reference<IPagerSnapshot> pager, BTreePageIDRef root) : pager(pager), rootPageID(root) {}
|
|
|
|
std::string toString() const {
|
|
std::string r;
|
|
|
|
Reference<PageCursor> c = pageCursor;
|
|
int maxDepth = 0;
|
|
while (c) {
|
|
c = c->parent;
|
|
++maxDepth;
|
|
}
|
|
|
|
c = pageCursor;
|
|
int depth = maxDepth;
|
|
while (c) {
|
|
r = format("[%d/%d: %s] ", depth--, maxDepth, c->toString().c_str()) + r;
|
|
c = c->parent;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
// Returns true if cursor position is a valid leaf page record
|
|
bool valid() const { return pageCursor && pageCursor->isLeaf() && pageCursor->cursor.valid(); }
|
|
|
|
// Returns true if cursor position is valid() and has a present record value
|
|
bool present() const { return valid() && pageCursor->cursor.get().value.present(); }
|
|
|
|
// Returns true if cursor position is present() and has an effective version <= v
|
|
bool presentAtVersion(Version v) { return present() && pageCursor->cursor.get().version <= v; }
|
|
|
|
// This is to enable an optimization for the case where all internal records are at the
|
|
// same version and there are no implicit clears
|
|
// *this MUST be valid()
|
|
bool presentAtExactVersion(Version v) const { return present() && pageCursor->cursor.get().version == v; }
|
|
|
|
// Returns true if cursor position is present() and has an effective version <= v
|
|
bool validAtVersion(Version v) { return valid() && pageCursor->cursor.get().version <= v; }
|
|
|
|
const RedwoodRecordRef& get() const { return pageCursor->cursor.get(); }
|
|
|
|
// Ensure that pageCursor is not shared with other cursors so we can modify it
|
|
void ensureUnshared() {
|
|
if (!pageCursor->isSoleOwner()) {
|
|
pageCursor = pageCursor->copy();
|
|
}
|
|
}
|
|
|
|
Future<Void> moveToRoot() {
|
|
// If pageCursor exists follow parent links to the root
|
|
if (pageCursor) {
|
|
while (pageCursor->parent) {
|
|
pageCursor = pageCursor->parent;
|
|
}
|
|
return Void();
|
|
}
|
|
|
|
// Otherwise read the root page
|
|
Future<Reference<const IPage>> root = readPage(pager, rootPageID, &dbBegin, &dbEnd);
|
|
return map(root, [=](Reference<const IPage> p) {
|
|
pageCursor = Reference<PageCursor>(new PageCursor(rootPageID, p));
|
|
return Void();
|
|
});
|
|
}
|
|
|
|
ACTOR Future<bool> seekLessThan_impl(InternalCursor* self, RedwoodRecordRef query, int prefetchBytes) {
|
|
Future<Void> f = self->moveToRoot();
|
|
// f will almost always be ready
|
|
if (!f.isReady()) {
|
|
wait(f);
|
|
}
|
|
|
|
self->ensureUnshared();
|
|
loop {
|
|
bool isLeaf = self->pageCursor->isLeaf();
|
|
bool success = self->pageCursor->cursor.seekLessThan(query);
|
|
|
|
// Skip backwards over internal page entries that do not link to child pages
|
|
if (!isLeaf) {
|
|
// While record has no value, move again
|
|
while (success && !self->pageCursor->cursor.get().value.present()) {
|
|
success = self->pageCursor->cursor.movePrev();
|
|
}
|
|
}
|
|
|
|
if (success) {
|
|
// If we found a record < query at a leaf page then return success
|
|
if (isLeaf) {
|
|
return true;
|
|
}
|
|
|
|
Reference<PageCursor> child = wait(self->pageCursor->getChild(self->pager, prefetchBytes));
|
|
self->pageCursor = child;
|
|
} else {
|
|
// No records < query on this page, so move to immediate previous record at leaf level
|
|
bool success = wait(self->move(false));
|
|
return success;
|
|
}
|
|
}
|
|
}
|
|
|
|
Future<bool> seekLessThan(RedwoodRecordRef query, int prefetchBytes) {
|
|
return seekLessThan_impl(this, query, prefetchBytes);
|
|
}
|
|
|
|
ACTOR Future<bool> move_impl(InternalCursor* self, bool forward) {
|
|
// Try to move pageCursor, if it fails to go parent, repeat until it works or root cursor can't be moved
|
|
while (1) {
|
|
self->ensureUnshared();
|
|
bool success = self->pageCursor->cursor.valid() &&
|
|
(forward ? self->pageCursor->cursor.moveNext() : self->pageCursor->cursor.movePrev());
|
|
|
|
// Skip over internal page entries that do not link to child pages
|
|
if (!self->pageCursor->isLeaf()) {
|
|
// While record has no value, move again
|
|
while (success && !self->pageCursor->cursor.get().value.present()) {
|
|
success = forward ? self->pageCursor->cursor.moveNext() : self->pageCursor->cursor.movePrev();
|
|
}
|
|
}
|
|
|
|
// Stop if successful or there's no parent to move to
|
|
if (success || !self->pageCursor->parent) {
|
|
break;
|
|
}
|
|
|
|
// Move to parent
|
|
self->pageCursor = self->pageCursor->parent;
|
|
}
|
|
|
|
// If pageCursor not valid we've reached an end of the tree
|
|
if (!self->pageCursor->cursor.valid()) {
|
|
return false;
|
|
}
|
|
|
|
// While not on a leaf page, move down to get to one.
|
|
while (!self->pageCursor->isLeaf()) {
|
|
// Skip over internal page entries that do not link to child pages
|
|
while (!self->pageCursor->cursor.get().value.present()) {
|
|
bool success = forward ? self->pageCursor->cursor.moveNext() : self->pageCursor->cursor.movePrev();
|
|
if (!success) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
Reference<PageCursor> child = wait(self->pageCursor->getChild(self->pager));
|
|
forward ? child->cursor.moveFirst() : child->cursor.moveLast();
|
|
self->pageCursor = child;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
Future<bool> move(bool forward) { return move_impl(this, forward); }
|
|
|
|
// Move to the first or last record of the database.
|
|
ACTOR Future<bool> move_end(InternalCursor* self, bool begin) {
|
|
Future<Void> f = self->moveToRoot();
|
|
|
|
// f will almost always be ready
|
|
if (!f.isReady()) {
|
|
wait(f);
|
|
}
|
|
|
|
self->ensureUnshared();
|
|
|
|
loop {
|
|
// Move to first or last record in the page
|
|
bool success = begin ? self->pageCursor->cursor.moveFirst() : self->pageCursor->cursor.moveLast();
|
|
|
|
// Skip over internal page entries that do not link to child pages
|
|
if (!self->pageCursor->isLeaf()) {
|
|
// While record has no value, move past it
|
|
while (success && !self->pageCursor->cursor.get().value.present()) {
|
|
success = begin ? self->pageCursor->cursor.moveNext() : self->pageCursor->cursor.movePrev();
|
|
}
|
|
}
|
|
|
|
// If it worked, return true if we've reached a leaf page otherwise go to the next child
|
|
if (success) {
|
|
if (self->pageCursor->isLeaf()) {
|
|
return true;
|
|
}
|
|
|
|
Reference<PageCursor> child = wait(self->pageCursor->getChild(self->pager));
|
|
self->pageCursor = child;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
Future<bool> moveFirst() { return move_end(this, true); }
|
|
Future<bool> moveLast() { return move_end(this, false); }
|
|
};
|
|
|
|
// Cursor designed for short lifespans.
|
|
// Holds references to all pages touched.
|
|
// All record references returned from it are valid until the cursor is destroyed.
|
|
class BTreeCursor {
|
|
Arena arena;
|
|
Reference<IPagerSnapshot> pager;
|
|
std::unordered_map<LogicalPageID, Reference<const IPage>> pages;
|
|
VersionedBTree* btree;
|
|
bool valid;
|
|
|
|
struct PathEntry {
|
|
BTreePage* btPage;
|
|
BTreePage::BinaryTree::Cursor cursor;
|
|
};
|
|
VectorRef<PathEntry> path;
|
|
|
|
public:
|
|
BTreeCursor() {}
|
|
|
|
bool isValid() const { return valid; }
|
|
|
|
std::string toString() const {
|
|
std::string r = format("{ptr=%p %s ", this, ::toString(pager->getVersion()).c_str());
|
|
for (int i = 0; i < path.size(); ++i) {
|
|
r += format("[%d/%d: %s] ", i + 1, path.size(),
|
|
path[i].cursor.valid() ? path[i].cursor.get().toString(path[i].btPage->isLeaf()).c_str()
|
|
: "<invalid>");
|
|
}
|
|
if (!valid) {
|
|
r += " (invalid) ";
|
|
}
|
|
r += "}";
|
|
return r;
|
|
}
|
|
|
|
const RedwoodRecordRef& get() { return path.back().cursor.get(); }
|
|
|
|
bool inRoot() const { return path.size() == 1; }
|
|
|
|
// Pop and return the page cursor at the end of the path.
|
|
// This is meant to enable range scans to consume the contents of a leaf page more efficiently.
|
|
// Can only be used when inRoot() is true.
|
|
BTreePage::BinaryTree::Cursor popPath() {
|
|
BTreePage::BinaryTree::Cursor c = path.back().cursor;
|
|
path.pop_back();
|
|
return c;
|
|
}
|
|
|
|
Future<Void> pushPage(BTreePageIDRef id, const RedwoodRecordRef& lowerBound,
|
|
const RedwoodRecordRef& upperBound) {
|
|
Reference<const IPage>& page = pages[id.front()];
|
|
if (page.isValid()) {
|
|
// The pager won't see this access so count it as a cache hit
|
|
++g_redwoodMetrics.pagerCacheHit;
|
|
path.push_back(arena, { (BTreePage*)page->begin(), getCursor(page) });
|
|
return Void();
|
|
}
|
|
|
|
return map(readPage(pager, id, &lowerBound, &upperBound), [this, &page, id](Reference<const IPage> p) {
|
|
page = p;
|
|
path.push_back(arena, { (BTreePage*)p->begin(), getCursor(p) });
|
|
return Void();
|
|
});
|
|
}
|
|
|
|
Future<Void> pushPage(BTreePage::BinaryTree::Cursor c) {
|
|
const RedwoodRecordRef& rec = c.get();
|
|
auto next = c;
|
|
next.moveNext();
|
|
BTreePageIDRef id = rec.getChildPage();
|
|
return pushPage(id, rec, next.getOrUpperBound());
|
|
}
|
|
|
|
Future<Void> init(VersionedBTree* btree_in, Reference<IPagerSnapshot> pager_in, BTreePageIDRef root) {
|
|
btree = btree_in;
|
|
pager = pager_in;
|
|
path.reserve(arena, 6);
|
|
valid = false;
|
|
return pushPage(root, dbBegin, dbEnd);
|
|
}
|
|
|
|
// Seeks cursor to query if it exists, the record before or after it, or an undefined and invalid
|
|
// position between those records
|
|
// If 0 is returned, then
|
|
// If the cursor is valid then it points to query
|
|
// If the cursor is not valid then the cursor points to some place in the btree such that
|
|
// If there is a record in the tree < query then movePrev() will move to it, and
|
|
// If there is a record in the tree > query then moveNext() will move to it.
|
|
// If non-zero is returned then the cursor is valid and the return value is logically equivalent
|
|
// to query.compare(cursor.get())
|
|
ACTOR Future<int> seek_impl(BTreeCursor* self, RedwoodRecordRef query, int prefetchBytes) {
|
|
state RedwoodRecordRef internalPageQuery = query.withMaxPageID();
|
|
self->path = self->path.slice(0, 1);
|
|
debug_printf("seek(%s, %d) start cursor = %s\n", query.toString().c_str(), prefetchBytes,
|
|
self->toString().c_str());
|
|
|
|
loop {
|
|
auto& entry = self->path.back();
|
|
if (entry.btPage->isLeaf()) {
|
|
int cmp = entry.cursor.seek(query);
|
|
self->valid = entry.cursor.valid() && !entry.cursor.node->isDeleted();
|
|
debug_printf("seek(%s, %d) loop exit cmp=%d cursor=%s\n", query.toString().c_str(), prefetchBytes,
|
|
cmp, self->toString().c_str());
|
|
return self->valid ? cmp : 0;
|
|
}
|
|
|
|
// Internal page, so seek to the branch where query must be
|
|
// Currently, after a subtree deletion internal page boundaries are still strictly adhered
|
|
// to and will be updated if anything is inserted into the cleared range, so if the seek fails
|
|
// or it finds an entry with a null child page then query does not exist in the BTree.
|
|
if (entry.cursor.seekLessThan(internalPageQuery) && entry.cursor.get().value.present()) {
|
|
debug_printf("seek(%s, %d) loop seek success cursor=%s\n", query.toString().c_str(), prefetchBytes,
|
|
self->toString().c_str());
|
|
Future<Void> f = self->pushPage(entry.cursor);
|
|
|
|
// Prefetch siblings, at least prefetchBytes, at level 2 but without jumping to another level 2
|
|
// sibling
|
|
if (prefetchBytes != 0 && entry.btPage->height == 2) {
|
|
auto c = entry.cursor;
|
|
bool fwd = prefetchBytes > 0;
|
|
prefetchBytes = abs(prefetchBytes);
|
|
// While we should still preload more bytes and a move in the target direction is successful
|
|
while (prefetchBytes > 0 && (fwd ? c.moveNext() : c.movePrev())) {
|
|
// If there is a page link, preload it.
|
|
if (c.get().value.present()) {
|
|
BTreePageIDRef childPage = c.get().getChildPage();
|
|
preLoadPage(self->pager.getPtr(), childPage);
|
|
prefetchBytes -= self->btree->m_blockSize * childPage.size();
|
|
}
|
|
}
|
|
}
|
|
|
|
wait(f);
|
|
} else {
|
|
self->valid = false;
|
|
debug_printf("seek(%s, %d) loop exit cmp=0 cursor=%s\n", query.toString().c_str(), prefetchBytes,
|
|
self->toString().c_str());
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
Future<int> seek(RedwoodRecordRef query, int prefetchBytes) { return seek_impl(this, query, prefetchBytes); }
|
|
|
|
ACTOR Future<Void> seekGTE_impl(BTreeCursor* self, RedwoodRecordRef query, int prefetchBytes) {
|
|
debug_printf("seekGTE(%s, %d) start\n", query.toString().c_str(), prefetchBytes);
|
|
int cmp = wait(self->seek(query, prefetchBytes));
|
|
if (cmp > 0 || (cmp == 0 && !self->isValid())) {
|
|
wait(self->moveNext());
|
|
}
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> seekGTE(RedwoodRecordRef query, int prefetchBytes) {
|
|
return seekGTE_impl(this, query, prefetchBytes);
|
|
}
|
|
|
|
ACTOR Future<Void> seekLT_impl(BTreeCursor* self, RedwoodRecordRef query, int prefetchBytes) {
|
|
debug_printf("seekLT(%s, %d) start\n", query.toString().c_str(), prefetchBytes);
|
|
int cmp = wait(self->seek(query, prefetchBytes));
|
|
if (cmp <= 0) {
|
|
wait(self->movePrev());
|
|
}
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> seekLT(RedwoodRecordRef query, int prefetchBytes) {
|
|
return seekLT_impl(this, query, -prefetchBytes);
|
|
}
|
|
|
|
ACTOR Future<Void> move_impl(BTreeCursor* self, bool forward) {
|
|
// Try to the move cursor at the end of the path in the correct direction
|
|
debug_printf("move%s() start cursor=%s\n", forward ? "Next" : "Prev", self->toString().c_str());
|
|
while (1) {
|
|
debug_printf("move%s() first loop cursor=%s\n", forward ? "Next" : "Prev", self->toString().c_str());
|
|
auto& entry = self->path.back();
|
|
bool success;
|
|
if (entry.cursor.valid()) {
|
|
success = forward ? entry.cursor.moveNext() : entry.cursor.movePrev();
|
|
} else {
|
|
success = forward ? entry.cursor.moveFirst() : false;
|
|
}
|
|
|
|
// Skip over internal page entries that do not link to child pages. There should never be two in a row.
|
|
if (success && !entry.btPage->isLeaf() && !entry.cursor.get().value.present()) {
|
|
success = forward ? entry.cursor.moveNext() : entry.cursor.movePrev();
|
|
ASSERT(!success || entry.cursor.get().value.present());
|
|
}
|
|
|
|
// Stop if successful
|
|
if (success) {
|
|
break;
|
|
}
|
|
|
|
if (self->path.size() == 1) {
|
|
self->valid = false;
|
|
return Void();
|
|
}
|
|
|
|
// Move to parent
|
|
self->path = self->path.slice(0, self->path.size() - 1);
|
|
}
|
|
|
|
// While not on a leaf page, move down to get to one.
|
|
while (1) {
|
|
debug_printf("move%s() second loop cursor=%s\n", forward ? "Next" : "Prev", self->toString().c_str());
|
|
auto& entry = self->path.back();
|
|
if (entry.btPage->isLeaf()) {
|
|
break;
|
|
}
|
|
|
|
// The last entry in an internal page could be a null link, if so move back
|
|
if (!forward && !entry.cursor.get().value.present()) {
|
|
ASSERT(entry.cursor.movePrev());
|
|
ASSERT(entry.cursor.get().value.present());
|
|
}
|
|
|
|
wait(self->pushPage(entry.cursor));
|
|
auto& newEntry = self->path.back();
|
|
ASSERT(forward ? newEntry.cursor.moveFirst() : newEntry.cursor.moveLast());
|
|
}
|
|
|
|
self->valid = true;
|
|
|
|
debug_printf("move%s() exit cursor=%s\n", forward ? "Next" : "Prev", self->toString().c_str());
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> moveNext() { return move_impl(this, true); }
|
|
Future<Void> movePrev() { return move_impl(this, false); }
|
|
};
|
|
|
|
Future<Void> initBTreeCursor(BTreeCursor* cursor, Version snapshotVersion) {
|
|
// Only committed versions can be read.
|
|
ASSERT(snapshotVersion <= m_lastCommittedVersion);
|
|
Reference<IPagerSnapshot> snapshot = m_pager->getReadSnapshot(snapshotVersion);
|
|
|
|
// This is a ref because snapshot will continue to hold the metakey value memory
|
|
KeyRef m = snapshot->getMetaKey();
|
|
|
|
return cursor->init(this, snapshot, ((MetaKey*)m.begin())->root.get());
|
|
}
|
|
|
|
// Cursor is for reading and interating over user visible KV pairs at a specific version
|
|
// KeyValueRefs returned become invalid once the cursor is moved
|
|
class Cursor : public IStoreCursor, public ReferenceCounted<Cursor>, public FastAllocated<Cursor>, NonCopyable {
|
|
public:
|
|
Cursor(Reference<IPagerSnapshot> pageSource, BTreePageIDRef root, Version internalRecordVersion)
|
|
: m_version(internalRecordVersion), m_cur1(pageSource, root), m_cur2(m_cur1) {}
|
|
|
|
void addref() { ReferenceCounted<Cursor>::addref(); }
|
|
void delref() { ReferenceCounted<Cursor>::delref(); }
|
|
|
|
private:
|
|
Version m_version;
|
|
// If kv is valid
|
|
// - kv.key references memory held by cur1
|
|
// - If cur1 points to a non split KV pair
|
|
// - kv.value references memory held by cur1
|
|
// - cur2 points to the next internal record after cur1
|
|
// Else
|
|
// - kv.value references memory in arena
|
|
// - cur2 points to the first internal record of the split KV pair
|
|
InternalCursor m_cur1;
|
|
InternalCursor m_cur2;
|
|
Arena m_arena;
|
|
Optional<KeyValueRef> m_kv;
|
|
|
|
public:
|
|
Future<Void> findEqual(KeyRef key) override { return find_impl(this, key, 0); }
|
|
Future<Void> findFirstEqualOrGreater(KeyRef key, int prefetchBytes) override {
|
|
return find_impl(this, key, 1, prefetchBytes);
|
|
}
|
|
Future<Void> findLastLessOrEqual(KeyRef key, int prefetchBytes) override {
|
|
return find_impl(this, key, -1, prefetchBytes);
|
|
}
|
|
|
|
Future<Void> next() override { return move(this, true); }
|
|
Future<Void> prev() override { return move(this, false); }
|
|
|
|
bool isValid() override { return m_kv.present(); }
|
|
|
|
KeyRef getKey() override { return m_kv.get().key; }
|
|
|
|
ValueRef getValue() override { return m_kv.get().value; }
|
|
|
|
std::string toString(bool includePaths = true) const {
|
|
std::string r;
|
|
r += format("Cursor(%p) ver: %" PRId64 " ", this, m_version);
|
|
if (m_kv.present()) {
|
|
r += format(" KV: '%s' -> '%s'", m_kv.get().key.printable().c_str(),
|
|
m_kv.get().value.printable().c_str());
|
|
} else {
|
|
r += " KV: <np>";
|
|
}
|
|
if (includePaths) {
|
|
r += format("\n Cur1: %s", m_cur1.toString().c_str());
|
|
r += format("\n Cur2: %s", m_cur2.toString().c_str());
|
|
} else {
|
|
if (m_cur1.valid()) {
|
|
r += format("\n Cur1: %s", m_cur1.get().toString().c_str());
|
|
}
|
|
if (m_cur2.valid()) {
|
|
r += format("\n Cur2: %s", m_cur2.get().toString().c_str());
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
private:
|
|
// find key in tree closest to or equal to key (at this cursor's version)
|
|
// for less than or equal use cmp < 0
|
|
// for greater than or equal use cmp > 0
|
|
// for equal use cmp == 0
|
|
ACTOR static Future<Void> find_impl(Cursor* self, KeyRef key, int cmp, int prefetchBytes = 0) {
|
|
state RedwoodRecordRef query(key, self->m_version + 1);
|
|
self->m_kv.reset();
|
|
|
|
wait(success(self->m_cur1.seekLessThan(query, prefetchBytes)));
|
|
debug_printf("find%sE(%s): %s\n", cmp > 0 ? "GT" : (cmp == 0 ? "" : "LT"), query.toString().c_str(),
|
|
self->toString().c_str());
|
|
|
|
// If we found the target key with a present value then return it as it is valid for any cmp type
|
|
if (self->m_cur1.present() && self->m_cur1.get().key == key) {
|
|
debug_printf("Target key found. Cursor: %s\n", self->toString().c_str());
|
|
self->m_kv = self->m_cur1.get().toKeyValueRef();
|
|
return Void();
|
|
}
|
|
|
|
// If cmp type is Equal and we reached here, we didn't find it
|
|
if (cmp == 0) {
|
|
return Void();
|
|
}
|
|
|
|
// cmp mode is GreaterThanOrEqual, so if we've reached here an equal key was not found and cur1 either
|
|
// points to a lesser key or is invalid.
|
|
if (cmp > 0) {
|
|
// If cursor is invalid, query was less than the first key in database so go to the first record
|
|
if (!self->m_cur1.valid()) {
|
|
bool valid = wait(self->m_cur1.moveFirst());
|
|
if (!valid) {
|
|
self->m_kv.reset();
|
|
return Void();
|
|
}
|
|
} else {
|
|
// Otherwise, move forward until we find a key greater than the target key.
|
|
// If multiversion data is present, the next record could have the same key as the initial
|
|
// record found but be at a newer version.
|
|
loop {
|
|
bool valid = wait(self->m_cur1.move(true));
|
|
if (!valid) {
|
|
self->m_kv.reset();
|
|
return Void();
|
|
}
|
|
|
|
if (self->m_cur1.get().key > key) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get the next present key at the target version. Handles invalid cursor too.
|
|
wait(self->next());
|
|
} else if (cmp < 0) {
|
|
// cmp mode is LessThanOrEqual. An equal key to the target key was already checked above, and the
|
|
// search was for LessThan query, so cur1 is already in the right place.
|
|
if (!self->m_cur1.valid()) {
|
|
self->m_kv.reset();
|
|
return Void();
|
|
}
|
|
|
|
// Move to previous present kv pair at the target version
|
|
wait(self->prev());
|
|
}
|
|
|
|
return Void();
|
|
}
|
|
|
|
ACTOR static Future<Void> move(Cursor* self, bool fwd) {
|
|
debug_printf("Cursor::move(%d): Start %s\n", fwd, self->toString().c_str());
|
|
ASSERT(self->m_cur1.valid());
|
|
|
|
// If kv is present then the key/version at cur1 was already returned so move to a new key
|
|
// Move cur1 until failure or a new key is found, keeping prior record visited in cur2
|
|
if (self->m_kv.present()) {
|
|
ASSERT(self->m_cur1.valid());
|
|
loop {
|
|
self->m_cur2 = self->m_cur1;
|
|
debug_printf("Cursor::move(%d): Advancing cur1 %s\n", fwd, self->toString().c_str());
|
|
bool valid = wait(self->m_cur1.move(fwd));
|
|
if (!valid || self->m_cur1.get().key != self->m_cur2.get().key) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Given two consecutive cursors c1 and c2, c1 represents a returnable record if
|
|
// c1 is present at exactly version v
|
|
// OR
|
|
// c1 is.presentAtVersion(v) && (!c2.validAtVersion() || c2.get().key != c1.get().key())
|
|
// Note the distinction between 'present' and 'valid'. Present means the value for the key
|
|
// exists at the version (but could be the empty string) while valid just means the internal
|
|
// record is in effect at that version but it could indicate that the key was cleared and
|
|
// no longer exists from the user's perspective at that version
|
|
if (self->m_cur1.valid()) {
|
|
self->m_cur2 = self->m_cur1;
|
|
debug_printf("Cursor::move(%d): Advancing cur2 %s\n", fwd, self->toString().c_str());
|
|
wait(success(self->m_cur2.move(true)));
|
|
}
|
|
|
|
while (self->m_cur1.valid()) {
|
|
|
|
if (self->m_cur1.get().version == self->m_version ||
|
|
(self->m_cur1.presentAtVersion(self->m_version) &&
|
|
(!self->m_cur2.validAtVersion(self->m_version) ||
|
|
self->m_cur2.get().key != self->m_cur1.get().key))) {
|
|
self->m_kv = self->m_cur1.get().toKeyValueRef();
|
|
return Void();
|
|
}
|
|
|
|
if (fwd) {
|
|
// Moving forward, move cur2 forward and keep cur1 pointing to the prior (predecessor) record
|
|
debug_printf("Cursor::move(%d): Moving forward %s\n", fwd, self->toString().c_str());
|
|
self->m_cur1 = self->m_cur2;
|
|
wait(success(self->m_cur2.move(true)));
|
|
} else {
|
|
// Moving backward, move cur1 backward and keep cur2 pointing to the prior (successor) record
|
|
debug_printf("Cursor::move(%d): Moving backward %s\n", fwd, self->toString().c_str());
|
|
self->m_cur2 = self->m_cur1;
|
|
wait(success(self->m_cur1.move(false)));
|
|
}
|
|
}
|
|
|
|
debug_printf("Cursor::move(%d): Exit, end of db reached. Cursor = %s\n", fwd, self->toString().c_str());
|
|
self->m_kv.reset();
|
|
|
|
return Void();
|
|
}
|
|
};
|
|
};
|
|
|
|
#include "fdbserver/art_impl.h"
|
|
|
|
RedwoodRecordRef VersionedBTree::dbBegin(LiteralStringRef(""));
|
|
RedwoodRecordRef VersionedBTree::dbEnd(LiteralStringRef("\xff\xff\xff\xff\xff"));
|
|
|
|
class KeyValueStoreRedwoodUnversioned : public IKeyValueStore {
|
|
public:
|
|
KeyValueStoreRedwoodUnversioned(std::string filePrefix, UID logID)
|
|
: m_filePrefix(filePrefix), m_concurrentReads(new FlowLock(SERVER_KNOBS->REDWOOD_KVSTORE_CONCURRENT_READS)) {
|
|
// TODO: This constructor should really just take an IVersionedStore
|
|
|
|
int64_t pageCacheBytes = g_network->isSimulated()
|
|
? (BUGGIFY ? FLOW_KNOBS->BUGGIFY_SIM_PAGE_CACHE_4K : FLOW_KNOBS->SIM_PAGE_CACHE_4K)
|
|
: FLOW_KNOBS->PAGE_CACHE_4K;
|
|
Version remapCleanupWindow = BUGGIFY ? deterministicRandom()->randomInt64(0, 1000) : SERVER_KNOBS->REDWOOD_REMAP_CLEANUP_WINDOW;
|
|
|
|
IPager2* pager = new DWALPager(SERVER_KNOBS->REDWOOD_DEFAULT_PAGE_SIZE, filePrefix, pageCacheBytes, remapCleanupWindow);
|
|
m_tree = new VersionedBTree(pager, filePrefix);
|
|
m_init = catchError(init_impl(this));
|
|
}
|
|
|
|
Future<Void> init() { return m_init; }
|
|
|
|
ACTOR Future<Void> init_impl(KeyValueStoreRedwoodUnversioned* self) {
|
|
TraceEvent(SevInfo, "RedwoodInit").detail("FilePrefix", self->m_filePrefix);
|
|
wait(self->m_tree->init());
|
|
Version v = self->m_tree->getLatestVersion();
|
|
self->m_tree->setWriteVersion(v + 1);
|
|
TraceEvent(SevInfo, "RedwoodInitComplete").detail("FilePrefix", self->m_filePrefix);
|
|
return Void();
|
|
}
|
|
|
|
ACTOR void shutdown(KeyValueStoreRedwoodUnversioned* self, bool dispose) {
|
|
TraceEvent(SevInfo, "RedwoodShutdown").detail("FilePrefix", self->m_filePrefix).detail("Dispose", dispose);
|
|
if (self->m_error.canBeSet()) {
|
|
self->m_error.sendError(actor_cancelled()); // Ideally this should be shutdown_in_progress
|
|
}
|
|
self->m_init.cancel();
|
|
Future<Void> closedFuture = self->m_tree->onClosed();
|
|
if (dispose)
|
|
self->m_tree->dispose();
|
|
else
|
|
self->m_tree->close();
|
|
wait(closedFuture);
|
|
self->m_closed.send(Void());
|
|
TraceEvent(SevInfo, "RedwoodShutdownComplete")
|
|
.detail("FilePrefix", self->m_filePrefix)
|
|
.detail("Dispose", dispose);
|
|
delete self;
|
|
}
|
|
|
|
void close() override { shutdown(this, false); }
|
|
|
|
void dispose() override { shutdown(this, true); }
|
|
|
|
Future<Void> onClosed() override { return m_closed.getFuture(); }
|
|
|
|
Future<Void> commit(bool sequential = false) override {
|
|
Future<Void> c = m_tree->commit();
|
|
m_tree->setOldestVersion(m_tree->getLatestVersion());
|
|
m_tree->setWriteVersion(m_tree->getWriteVersion() + 1);
|
|
return catchError(c);
|
|
}
|
|
|
|
KeyValueStoreType getType() const override { return KeyValueStoreType::SSD_REDWOOD_V1; }
|
|
|
|
StorageBytes getStorageBytes() const override { return m_tree->getStorageBytes(); }
|
|
|
|
Future<Void> getError() { return delayed(m_error.getFuture()); };
|
|
|
|
void clear(KeyRangeRef range, const Arena* arena = 0) {
|
|
debug_printf("CLEAR %s\n", printable(range).c_str());
|
|
m_tree->clear(range);
|
|
}
|
|
|
|
void set(KeyValueRef keyValue, const Arena* arena = nullptr) override {
|
|
debug_printf("SET %s\n", printable(keyValue).c_str());
|
|
m_tree->set(keyValue);
|
|
}
|
|
|
|
Future<Standalone<RangeResultRef>> readRange(KeyRangeRef keys, int rowLimit = 1 << 30,
|
|
int byteLimit = 1 << 30) override {
|
|
debug_printf("READRANGE %s\n", printable(keys).c_str());
|
|
return catchError(readRange_impl(this, keys, rowLimit, byteLimit));
|
|
}
|
|
|
|
ACTOR static Future<Standalone<RangeResultRef>> readRange_impl(KeyValueStoreRedwoodUnversioned* self, KeyRange keys,
|
|
int rowLimit, int byteLimit) {
|
|
state VersionedBTree::BTreeCursor cur;
|
|
wait(self->m_tree->initBTreeCursor(&cur, self->m_tree->getLastCommittedVersion()));
|
|
|
|
state Reference<FlowLock> readLock = self->m_concurrentReads;
|
|
wait(readLock->take());
|
|
state FlowLock::Releaser releaser(*readLock);
|
|
++g_redwoodMetrics.opGetRange;
|
|
|
|
state Standalone<RangeResultRef> result;
|
|
state int accumulatedBytes = 0;
|
|
ASSERT(byteLimit > 0);
|
|
|
|
if (rowLimit == 0) {
|
|
return result;
|
|
}
|
|
|
|
// Prefetch is disabled for now pending some decent logic for deciding how much to fetch
|
|
state int prefetchBytes = 0;
|
|
|
|
if (rowLimit > 0) {
|
|
wait(cur.seekGTE(keys.begin, prefetchBytes));
|
|
while (cur.isValid()) {
|
|
// Read page contents without using waits
|
|
bool isRoot = cur.inRoot();
|
|
BTreePage::BinaryTree::Cursor leafCursor = cur.popPath();
|
|
while (leafCursor.valid()) {
|
|
KeyValueRef kv = leafCursor.get().toKeyValueRef();
|
|
if (kv.key >= keys.end) {
|
|
break;
|
|
}
|
|
accumulatedBytes += kv.expectedSize();
|
|
result.push_back_deep(result.arena(), kv);
|
|
if (--rowLimit == 0 || accumulatedBytes >= byteLimit) {
|
|
break;
|
|
}
|
|
leafCursor.moveNext();
|
|
}
|
|
// Stop if the leaf cursor is still valid which means we hit a key or size limit or
|
|
// if we started in the root page
|
|
if (leafCursor.valid() || isRoot) {
|
|
break;
|
|
}
|
|
wait(cur.moveNext());
|
|
}
|
|
} else {
|
|
wait(cur.seekLT(keys.end, prefetchBytes));
|
|
while (cur.isValid()) {
|
|
// Read page contents without using waits
|
|
bool isRoot = cur.inRoot();
|
|
BTreePage::BinaryTree::Cursor leafCursor = cur.popPath();
|
|
while (leafCursor.valid()) {
|
|
KeyValueRef kv = leafCursor.get().toKeyValueRef();
|
|
if (kv.key < keys.begin) {
|
|
break;
|
|
}
|
|
accumulatedBytes += kv.expectedSize();
|
|
result.push_back_deep(result.arena(), kv);
|
|
if (++rowLimit == 0 || accumulatedBytes >= byteLimit) {
|
|
break;
|
|
}
|
|
leafCursor.movePrev();
|
|
}
|
|
// Stop if the leaf cursor is still valid which means we hit a key or size limit or
|
|
// if we started in the root page
|
|
if (leafCursor.valid() || isRoot) {
|
|
break;
|
|
}
|
|
wait(cur.movePrev());
|
|
}
|
|
}
|
|
|
|
result.more = rowLimit == 0 || accumulatedBytes >= byteLimit;
|
|
if (result.more) {
|
|
ASSERT(result.size() > 0);
|
|
result.readThrough = result[result.size() - 1].key;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
ACTOR static Future<Optional<Value>> readValue_impl(KeyValueStoreRedwoodUnversioned* self, Key key,
|
|
Optional<UID> debugID) {
|
|
state VersionedBTree::BTreeCursor cur;
|
|
wait(self->m_tree->initBTreeCursor(&cur, self->m_tree->getLastCommittedVersion()));
|
|
|
|
state Reference<FlowLock> readLock = self->m_concurrentReads;
|
|
wait(readLock->take());
|
|
state FlowLock::Releaser releaser(*readLock);
|
|
++g_redwoodMetrics.opGet;
|
|
|
|
wait(cur.seekGTE(key, 0));
|
|
if (cur.isValid() && cur.get().key == key) {
|
|
return cur.get().value.get();
|
|
}
|
|
return Optional<Value>();
|
|
}
|
|
|
|
Future<Optional<Value>> readValue(KeyRef key, Optional<UID> debugID = Optional<UID>()) {
|
|
return catchError(readValue_impl(this, key, debugID));
|
|
}
|
|
|
|
ACTOR static Future<Optional<Value>> readValuePrefix_impl(KeyValueStoreRedwoodUnversioned* self, Key key,
|
|
int maxLength, Optional<UID> debugID) {
|
|
state VersionedBTree::BTreeCursor cur;
|
|
wait(self->m_tree->initBTreeCursor(&cur, self->m_tree->getLastCommittedVersion()));
|
|
|
|
state Reference<FlowLock> readLock = self->m_concurrentReads;
|
|
wait(readLock->take());
|
|
state FlowLock::Releaser releaser(*readLock);
|
|
++g_redwoodMetrics.opGet;
|
|
|
|
wait(cur.seekGTE(key, 0));
|
|
if (cur.isValid() && cur.get().key == key) {
|
|
Value v = cur.get().value.get();
|
|
int len = std::min(v.size(), maxLength);
|
|
return Value(v.substr(0, len));
|
|
}
|
|
|
|
return Optional<Value>();
|
|
}
|
|
|
|
Future<Optional<Value>> readValuePrefix(KeyRef key, int maxLength, Optional<UID> debugID = Optional<UID>()) {
|
|
return catchError(readValuePrefix_impl(this, key, maxLength, debugID));
|
|
}
|
|
|
|
virtual ~KeyValueStoreRedwoodUnversioned(){};
|
|
|
|
private:
|
|
std::string m_filePrefix;
|
|
VersionedBTree* m_tree;
|
|
Future<Void> m_init;
|
|
Promise<Void> m_closed;
|
|
Promise<Void> m_error;
|
|
Reference<FlowLock> m_concurrentReads;
|
|
|
|
template <typename T>
|
|
inline Future<T> catchError(Future<T> f) {
|
|
return forwardError(f, m_error);
|
|
}
|
|
};
|
|
|
|
IKeyValueStore* keyValueStoreRedwoodV1(std::string const& filename, UID logID) {
|
|
return new KeyValueStoreRedwoodUnversioned(filename, logID);
|
|
}
|
|
|
|
int randomSize(int max) {
|
|
int n = pow(deterministicRandom()->random01(), 3) * max;
|
|
return n;
|
|
}
|
|
|
|
StringRef randomString(Arena& arena, int len, char firstChar = 'a', char lastChar = 'z') {
|
|
++lastChar;
|
|
StringRef s = makeString(len, arena);
|
|
for (int i = 0; i < len; ++i) {
|
|
*(uint8_t*)(s.begin() + i) = (uint8_t)deterministicRandom()->randomInt(firstChar, lastChar);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Standalone<StringRef> randomString(int len, char firstChar = 'a', char lastChar = 'z') {
|
|
Standalone<StringRef> s;
|
|
(StringRef&)s = randomString(s.arena(), len, firstChar, lastChar);
|
|
return s;
|
|
}
|
|
|
|
KeyValue randomKV(int maxKeySize = 10, int maxValueSize = 5) {
|
|
int kLen = randomSize(1 + maxKeySize);
|
|
int vLen = maxValueSize > 0 ? randomSize(maxValueSize) : 0;
|
|
|
|
KeyValue kv;
|
|
|
|
kv.key = randomString(kv.arena(), kLen, 'a', 'm');
|
|
for (int i = 0; i < kLen; ++i) mutateString(kv.key)[i] = (uint8_t)deterministicRandom()->randomInt('a', 'm');
|
|
|
|
if (vLen > 0) {
|
|
kv.value = randomString(kv.arena(), vLen, 'n', 'z');
|
|
for (int i = 0; i < vLen; ++i) mutateString(kv.value)[i] = (uint8_t)deterministicRandom()->randomInt('o', 'z');
|
|
}
|
|
|
|
return kv;
|
|
}
|
|
|
|
// Verify a range using a BTreeCursor.
|
|
// Assumes that the BTree holds a single data version and the version is 0.
|
|
ACTOR Future<int> verifyRangeBTreeCursor(VersionedBTree* btree, Key start, Key end, Version v,
|
|
std::map<std::pair<std::string, Version>, Optional<std::string>>* written,
|
|
int* pErrorCount) {
|
|
state int errors = 0;
|
|
if (end <= start) end = keyAfter(start);
|
|
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator i =
|
|
written->lower_bound(std::make_pair(start.toString(), 0));
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator iEnd =
|
|
written->upper_bound(std::make_pair(end.toString(), 0));
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator iLast;
|
|
|
|
state VersionedBTree::BTreeCursor cur;
|
|
wait(btree->initBTreeCursor(&cur, v));
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s): Start\n", v, start.printable().c_str(), end.printable().c_str());
|
|
|
|
// Randomly use the cursor for something else first.
|
|
if (deterministicRandom()->coinflip()) {
|
|
state Key randomKey = randomKV().key;
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s): Dummy seek to '%s'\n", v, start.printable().c_str(),
|
|
end.printable().c_str(), randomKey.toString().c_str());
|
|
wait(success(cur.seek(randomKey, 0)));
|
|
}
|
|
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s): Actual seek\n", v, start.printable().c_str(),
|
|
end.printable().c_str());
|
|
wait(cur.seekGTE(start, 0));
|
|
|
|
state std::vector<KeyValue> results;
|
|
|
|
while (cur.isValid() && cur.get().key < end) {
|
|
// Find the next written kv pair that would be present at this version
|
|
while (1) {
|
|
iLast = i;
|
|
if (i == iEnd) break;
|
|
++i;
|
|
|
|
if (iLast->first.second <= v && iLast->second.present() &&
|
|
(i == iEnd || i->first.first != iLast->first.first || i->first.second > v)) {
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s) Found key in written map: %s\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), iLast->first.first.c_str());
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (iLast == iEnd) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' vs nothing in written map.\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur.get().key.toString().c_str());
|
|
break;
|
|
}
|
|
|
|
if (cur.get().key != iLast->first.first) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' but expected '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur.get().key.toString().c_str(),
|
|
iLast->first.first.c_str());
|
|
break;
|
|
}
|
|
if (cur.get().value.get() != iLast->second.get()) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' has tree value '%s' but expected '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur.get().key.toString().c_str(),
|
|
cur.get().value.get().toString().c_str(), iLast->second.get().c_str());
|
|
break;
|
|
}
|
|
|
|
ASSERT(errors == 0);
|
|
|
|
results.push_back(KeyValue(KeyValueRef(cur.get().key, cur.get().value.get())));
|
|
wait(cur.moveNext());
|
|
}
|
|
|
|
// Make sure there are no further written kv pairs that would be present at this version.
|
|
while (1) {
|
|
iLast = i;
|
|
if (i == iEnd) break;
|
|
++i;
|
|
if (iLast->first.second <= v && iLast->second.present() &&
|
|
(i == iEnd || i->first.first != iLast->first.first || i->first.second > v))
|
|
break;
|
|
}
|
|
|
|
if (iLast != iEnd) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree range ended but written has @%" PRId64 " '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), iLast->first.second, iLast->first.first.c_str());
|
|
}
|
|
|
|
debug_printf("VerifyRangeReverse(@%" PRId64 ", %s, %s): start\n", v, start.printable().c_str(),
|
|
end.printable().c_str());
|
|
|
|
// Randomly use a new cursor at the same version for the reverse range read, if the version is still available for
|
|
// opening new cursors
|
|
if (v >= btree->getOldestVersion() && deterministicRandom()->coinflip()) {
|
|
cur = VersionedBTree::BTreeCursor();
|
|
wait(btree->initBTreeCursor(&cur, v));
|
|
}
|
|
|
|
// Now read the range from the tree in reverse order and compare to the saved results
|
|
wait(cur.seekLT(end, 0));
|
|
|
|
state std::vector<KeyValue>::const_reverse_iterator r = results.rbegin();
|
|
|
|
while (cur.isValid() && cur.get().key >= start) {
|
|
if (r == results.rend()) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' vs nothing in written map.\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur.get().key.toString().c_str());
|
|
break;
|
|
}
|
|
|
|
if (cur.get().key != r->key) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' but expected '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur.get().key.toString().c_str(),
|
|
r->key.toString().c_str());
|
|
break;
|
|
}
|
|
if (cur.get().value.get() != r->value) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64
|
|
", %s, %s) ERROR: Tree key '%s' has tree value '%s' but expected '%s'\n",
|
|
v, start.printable().c_str(), end.printable().c_str(), cur.get().key.toString().c_str(),
|
|
cur.get().value.get().toString().c_str(), r->value.toString().c_str());
|
|
break;
|
|
}
|
|
|
|
++r;
|
|
wait(cur.movePrev());
|
|
}
|
|
|
|
if (r != results.rend()) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64 ", %s, %s) ERROR: Tree range ended but written has '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), r->key.toString().c_str());
|
|
}
|
|
|
|
return errors;
|
|
}
|
|
|
|
ACTOR Future<int> verifyRange(VersionedBTree* btree, Key start, Key end, Version v,
|
|
std::map<std::pair<std::string, Version>, Optional<std::string>>* written,
|
|
int* pErrorCount) {
|
|
state int errors = 0;
|
|
if (end <= start) end = keyAfter(start);
|
|
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator i =
|
|
written->lower_bound(std::make_pair(start.toString(), 0));
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator iEnd =
|
|
written->upper_bound(std::make_pair(end.toString(), 0));
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator iLast;
|
|
|
|
state Reference<IStoreCursor> cur = btree->readAtVersion(v);
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s): Start cur=%p\n", v, start.printable().c_str(),
|
|
end.printable().c_str(), cur.getPtr());
|
|
|
|
// Randomly use the cursor for something else first.
|
|
if (deterministicRandom()->coinflip()) {
|
|
state Key randomKey = randomKV().key;
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s): Dummy seek to '%s'\n", v, start.printable().c_str(),
|
|
end.printable().c_str(), randomKey.toString().c_str());
|
|
wait(deterministicRandom()->coinflip() ? cur->findFirstEqualOrGreater(randomKey)
|
|
: cur->findLastLessOrEqual(randomKey));
|
|
}
|
|
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s): Actual seek\n", v, start.printable().c_str(),
|
|
end.printable().c_str());
|
|
wait(cur->findFirstEqualOrGreater(start));
|
|
|
|
state std::vector<KeyValue> results;
|
|
|
|
while (cur->isValid() && cur->getKey() < end) {
|
|
// Find the next written kv pair that would be present at this version
|
|
while (1) {
|
|
iLast = i;
|
|
if (i == iEnd) break;
|
|
++i;
|
|
|
|
if (iLast->first.second <= v && iLast->second.present() &&
|
|
(i == iEnd || i->first.first != iLast->first.first || i->first.second > v)) {
|
|
debug_printf("VerifyRange(@%" PRId64 ", %s, %s) Found key in written map: %s\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), iLast->first.first.c_str());
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (iLast == iEnd) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' vs nothing in written map.\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur->getKey().toString().c_str());
|
|
break;
|
|
}
|
|
|
|
if (cur->getKey() != iLast->first.first) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' but expected '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur->getKey().toString().c_str(),
|
|
iLast->first.first.c_str());
|
|
break;
|
|
}
|
|
if (cur->getValue() != iLast->second.get()) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' has tree value '%s' but expected '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur->getKey().toString().c_str(),
|
|
cur->getValue().toString().c_str(), iLast->second.get().c_str());
|
|
break;
|
|
}
|
|
|
|
ASSERT(errors == 0);
|
|
|
|
results.push_back(KeyValue(KeyValueRef(cur->getKey(), cur->getValue())));
|
|
wait(cur->next());
|
|
}
|
|
|
|
// Make sure there are no further written kv pairs that would be present at this version.
|
|
while (1) {
|
|
iLast = i;
|
|
if (i == iEnd) break;
|
|
++i;
|
|
if (iLast->first.second <= v && iLast->second.present() &&
|
|
(i == iEnd || i->first.first != iLast->first.first || i->first.second > v))
|
|
break;
|
|
}
|
|
|
|
if (iLast != iEnd) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRange(@%" PRId64 ", %s, %s) ERROR: Tree range ended but written has @%" PRId64 " '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), iLast->first.second, iLast->first.first.c_str());
|
|
}
|
|
|
|
debug_printf("VerifyRangeReverse(@%" PRId64 ", %s, %s): start\n", v, start.printable().c_str(),
|
|
end.printable().c_str());
|
|
|
|
// Randomly use a new cursor at the same version for the reverse range read, if the version is still available for
|
|
// opening new cursors
|
|
if (v >= btree->getOldestVersion() && deterministicRandom()->coinflip()) {
|
|
cur = btree->readAtVersion(v);
|
|
}
|
|
|
|
// Now read the range from the tree in reverse order and compare to the saved results
|
|
wait(cur->findLastLessOrEqual(end));
|
|
if (cur->isValid() && cur->getKey() == end) wait(cur->prev());
|
|
|
|
state std::vector<KeyValue>::const_reverse_iterator r = results.rbegin();
|
|
|
|
while (cur->isValid() && cur->getKey() >= start) {
|
|
if (r == results.rend()) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' vs nothing in written map.\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur->getKey().toString().c_str());
|
|
break;
|
|
}
|
|
|
|
if (cur->getKey() != r->key) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64 ", %s, %s) ERROR: Tree key '%s' but expected '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), cur->getKey().toString().c_str(),
|
|
r->key.toString().c_str());
|
|
break;
|
|
}
|
|
if (cur->getValue() != r->value) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64
|
|
", %s, %s) ERROR: Tree key '%s' has tree value '%s' but expected '%s'\n",
|
|
v, start.printable().c_str(), end.printable().c_str(), cur->getKey().toString().c_str(),
|
|
cur->getValue().toString().c_str(), r->value.toString().c_str());
|
|
break;
|
|
}
|
|
|
|
++r;
|
|
wait(cur->prev());
|
|
}
|
|
|
|
if (r != results.rend()) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("VerifyRangeReverse(@%" PRId64 ", %s, %s) ERROR: Tree range ended but written has '%s'\n", v,
|
|
start.printable().c_str(), end.printable().c_str(), r->key.toString().c_str());
|
|
}
|
|
|
|
return errors;
|
|
}
|
|
|
|
// Verify the result of point reads for every set or cleared key at the given version
|
|
ACTOR Future<int> seekAll(VersionedBTree* btree, Version v,
|
|
std::map<std::pair<std::string, Version>, Optional<std::string>>* written, int* pErrorCount) {
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator i = written->cbegin();
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator iEnd = written->cend();
|
|
state int errors = 0;
|
|
state Reference<IStoreCursor> cur = btree->readAtVersion(v);
|
|
|
|
while (i != iEnd) {
|
|
state std::string key = i->first.first;
|
|
state Version ver = i->first.second;
|
|
if (ver == v) {
|
|
state Optional<std::string> val = i->second;
|
|
debug_printf("Verifying @%" PRId64 " '%s'\n", ver, key.c_str());
|
|
state Arena arena;
|
|
wait(cur->findEqual(KeyRef(arena, key)));
|
|
|
|
if (val.present()) {
|
|
if (!(cur->isValid() && cur->getKey() == key && cur->getValue() == val.get())) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
if (!cur->isValid())
|
|
printf("Verify ERROR: key_not_found: '%s' -> '%s' @%" PRId64 "\n", key.c_str(),
|
|
val.get().c_str(), ver);
|
|
else if (cur->getKey() != key)
|
|
printf("Verify ERROR: key_incorrect: found '%s' expected '%s' @%" PRId64 "\n",
|
|
cur->getKey().toString().c_str(), key.c_str(), ver);
|
|
else if (cur->getValue() != val.get())
|
|
printf("Verify ERROR: value_incorrect: for '%s' found '%s' expected '%s' @%" PRId64 "\n",
|
|
cur->getKey().toString().c_str(), cur->getValue().toString().c_str(), val.get().c_str(),
|
|
ver);
|
|
}
|
|
} else {
|
|
if (cur->isValid() && cur->getKey() == key) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("Verify ERROR: cleared_key_found: '%s' -> '%s' @%" PRId64 "\n", key.c_str(),
|
|
cur->getValue().toString().c_str(), ver);
|
|
}
|
|
}
|
|
}
|
|
++i;
|
|
}
|
|
return errors;
|
|
}
|
|
|
|
// Verify the result of point reads for every set or cleared key at the given version
|
|
ACTOR Future<int> seekAllBTreeCursor(VersionedBTree* btree, Version v,
|
|
std::map<std::pair<std::string, Version>, Optional<std::string>>* written,
|
|
int* pErrorCount) {
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator i = written->cbegin();
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>>::const_iterator iEnd = written->cend();
|
|
state int errors = 0;
|
|
state VersionedBTree::BTreeCursor cur;
|
|
|
|
wait(btree->initBTreeCursor(&cur, v));
|
|
|
|
while (i != iEnd) {
|
|
state std::string key = i->first.first;
|
|
state Version ver = i->first.second;
|
|
if (ver == v) {
|
|
state Optional<std::string> val = i->second;
|
|
debug_printf("Verifying @%" PRId64 " '%s'\n", ver, key.c_str());
|
|
state Arena arena;
|
|
wait(cur.seekGTE(RedwoodRecordRef(KeyRef(arena, key), 0), 0));
|
|
bool foundKey = cur.isValid() && cur.get().key == key;
|
|
bool hasValue = foundKey && cur.get().value.present();
|
|
|
|
if (val.present()) {
|
|
bool valueMatch = hasValue && cur.get().value.get() == val.get();
|
|
if (!foundKey || !hasValue || !valueMatch) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
if (!foundKey) {
|
|
printf("Verify ERROR: key_not_found: '%s' -> '%s' @%" PRId64 "\n", key.c_str(),
|
|
val.get().c_str(), ver);
|
|
} else if (!hasValue) {
|
|
printf("Verify ERROR: value_not_found: '%s' -> '%s' @%" PRId64 "\n", key.c_str(),
|
|
val.get().c_str(), ver);
|
|
} else if (!valueMatch) {
|
|
printf("Verify ERROR: value_incorrect: for '%s' found '%s' expected '%s' @%" PRId64 "\n",
|
|
key.c_str(), cur.get().value.get().toString().c_str(), val.get().c_str(), ver);
|
|
}
|
|
}
|
|
} else if (foundKey && hasValue) {
|
|
++errors;
|
|
++*pErrorCount;
|
|
printf("Verify ERROR: cleared_key_found: '%s' -> '%s' @%" PRId64 "\n", key.c_str(),
|
|
cur.get().value.get().toString().c_str(), ver);
|
|
}
|
|
}
|
|
++i;
|
|
}
|
|
return errors;
|
|
}
|
|
|
|
ACTOR Future<Void> verify(VersionedBTree* btree, FutureStream<Version> vStream,
|
|
std::map<std::pair<std::string, Version>, Optional<std::string>>* written, int* pErrorCount,
|
|
bool serial) {
|
|
state Future<int> fRangeAll;
|
|
state Future<int> fRangeRandom;
|
|
state Future<int> fSeekAll;
|
|
|
|
// Queue of committed versions still readable from btree
|
|
state std::deque<Version> committedVersions;
|
|
|
|
try {
|
|
loop {
|
|
state Version v = waitNext(vStream);
|
|
committedVersions.push_back(v);
|
|
|
|
// Remove expired versions
|
|
while (!committedVersions.empty() && committedVersions.front() < btree->getOldestVersion()) {
|
|
committedVersions.pop_front();
|
|
}
|
|
|
|
// Continue if the versions list is empty, which won't wait until it reaches the oldest readable
|
|
// btree version which will already be in vStream.
|
|
if(committedVersions.empty()) {
|
|
continue;
|
|
}
|
|
|
|
// Choose a random committed version.
|
|
v = committedVersions[deterministicRandom()->randomInt(0, committedVersions.size())];
|
|
|
|
debug_printf("Using committed version %" PRId64 "\n", v);
|
|
// Get a cursor at v so that v doesn't get expired between the possibly serial steps below.
|
|
state Reference<IStoreCursor> cur = btree->readAtVersion(v);
|
|
|
|
debug_printf("Verifying entire key range at version %" PRId64 "\n", v);
|
|
if (deterministicRandom()->coinflip()) {
|
|
fRangeAll =
|
|
verifyRange(btree, LiteralStringRef(""), LiteralStringRef("\xff\xff"), v, written, pErrorCount);
|
|
} else {
|
|
fRangeAll = verifyRangeBTreeCursor(btree, LiteralStringRef(""), LiteralStringRef("\xff\xff"), v,
|
|
written, pErrorCount);
|
|
}
|
|
if (serial) {
|
|
wait(success(fRangeAll));
|
|
}
|
|
|
|
Key begin = randomKV().key;
|
|
Key end = randomKV().key;
|
|
debug_printf("Verifying range (%s, %s) at version %" PRId64 "\n", toString(begin).c_str(),
|
|
toString(end).c_str(), v);
|
|
if (deterministicRandom()->coinflip()) {
|
|
fRangeRandom = verifyRange(btree, begin, end, v, written, pErrorCount);
|
|
} else {
|
|
fRangeRandom = verifyRangeBTreeCursor(btree, begin, end, v, written, pErrorCount);
|
|
}
|
|
if (serial) {
|
|
wait(success(fRangeRandom));
|
|
}
|
|
|
|
debug_printf("Verifying seeks to each changed key at version %" PRId64 "\n", v);
|
|
if (deterministicRandom()->coinflip()) {
|
|
fSeekAll = seekAll(btree, v, written, pErrorCount);
|
|
} else {
|
|
fSeekAll = seekAllBTreeCursor(btree, v, written, pErrorCount);
|
|
}
|
|
if (serial) {
|
|
wait(success(fSeekAll));
|
|
}
|
|
|
|
wait(success(fRangeAll) && success(fRangeRandom) && success(fSeekAll));
|
|
|
|
printf("Verified version %" PRId64 ", %d errors\n", v, *pErrorCount);
|
|
|
|
if (*pErrorCount != 0) break;
|
|
}
|
|
} catch (Error& e) {
|
|
if (e.code() != error_code_end_of_stream && e.code() != error_code_transaction_too_old) {
|
|
throw;
|
|
}
|
|
}
|
|
return Void();
|
|
}
|
|
|
|
// Does a random range read, doesn't trap/report errors
|
|
ACTOR Future<Void> randomReader(VersionedBTree* btree) {
|
|
try {
|
|
state Reference<IStoreCursor> cur;
|
|
loop {
|
|
wait(yield());
|
|
if (!cur || deterministicRandom()->random01() > .01) {
|
|
Version v = btree->getLastCommittedVersion();
|
|
cur = btree->readAtVersion(v);
|
|
}
|
|
|
|
state KeyValue kv = randomKV(10, 0);
|
|
wait(cur->findFirstEqualOrGreater(kv.key));
|
|
state int c = deterministicRandom()->randomInt(0, 100);
|
|
while (cur->isValid() && c-- > 0) {
|
|
wait(success(cur->next()));
|
|
wait(yield());
|
|
}
|
|
}
|
|
} catch (Error& e) {
|
|
if (e.code() != error_code_transaction_too_old) {
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
return Void();
|
|
}
|
|
|
|
struct IntIntPair {
|
|
IntIntPair() {}
|
|
IntIntPair(int k, int v) : k(k), v(v) {}
|
|
|
|
IntIntPair(Arena& arena, const IntIntPair& toCopy) { *this = toCopy; }
|
|
|
|
struct Delta {
|
|
bool prefixSource;
|
|
bool deleted;
|
|
int dk;
|
|
int dv;
|
|
|
|
IntIntPair apply(const IntIntPair& base, Arena& arena) { return { base.k + dk, base.v + dv }; }
|
|
|
|
void setPrefixSource(bool val) { prefixSource = val; }
|
|
|
|
bool getPrefixSource() const { return prefixSource; }
|
|
|
|
void setDeleted(bool val) { deleted = val; }
|
|
|
|
bool getDeleted() const { return deleted; }
|
|
|
|
int size() const { return sizeof(Delta); }
|
|
|
|
std::string toString() const {
|
|
return format("DELTA{prefixSource=%d deleted=%d dk=%d(0x%x) dv=%d(0x%x)}", prefixSource, deleted, dk, dk,
|
|
dv, dv);
|
|
}
|
|
};
|
|
|
|
// For IntIntPair, skipLen will be in units of fields, not bytes
|
|
int getCommonPrefixLen(const IntIntPair& other, int skip = 0) const {
|
|
if (k == other.k) {
|
|
if (v == other.v) {
|
|
return 2;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int compare(const IntIntPair& rhs, int skip = 0) const {
|
|
if (skip == 2) {
|
|
return 0;
|
|
}
|
|
int cmp = (skip > 0) ? 0 : (k - rhs.k);
|
|
|
|
if (cmp == 0) {
|
|
cmp = v - rhs.v;
|
|
}
|
|
return cmp;
|
|
}
|
|
|
|
bool operator==(const IntIntPair& rhs) const { return compare(rhs) == 0; }
|
|
bool operator!=(const IntIntPair& rhs) const { return compare(rhs) != 0; }
|
|
|
|
bool operator<(const IntIntPair& rhs) const { return compare(rhs) < 0; }
|
|
bool operator>(const IntIntPair& rhs) const { return compare(rhs) > 0; }
|
|
bool operator<=(const IntIntPair& rhs) const { return compare(rhs) <= 0; }
|
|
bool operator>=(const IntIntPair& rhs) const { return compare(rhs) >= 0; }
|
|
|
|
int deltaSize(const IntIntPair& base, int skipLen, bool worstcase) const { return sizeof(Delta); }
|
|
|
|
int writeDelta(Delta& d, const IntIntPair& base, int commonPrefix = -1) const {
|
|
d.prefixSource = false;
|
|
d.deleted = false;
|
|
d.dk = k - base.k;
|
|
d.dv = v - base.v;
|
|
return sizeof(Delta);
|
|
}
|
|
|
|
int k;
|
|
int v;
|
|
|
|
std::string toString() const { return format("{k=%d(0x%x) v=%d(0x%x)}", k, k, v, v); }
|
|
};
|
|
|
|
int deltaTest(RedwoodRecordRef rec, RedwoodRecordRef base) {
|
|
std::vector<uint8_t> buf(rec.key.size() + rec.value.orDefault(StringRef()).size() + 20);
|
|
RedwoodRecordRef::Delta& d = *(RedwoodRecordRef::Delta*)&buf.front();
|
|
|
|
Arena mem;
|
|
int expectedSize = rec.deltaSize(base, 0, false);
|
|
int deltaSize = rec.writeDelta(d, base);
|
|
RedwoodRecordRef decoded = d.apply(base, mem);
|
|
|
|
if (decoded != rec || expectedSize != deltaSize || d.size() != deltaSize) {
|
|
printf("\n");
|
|
printf("Base: %s\n", base.toString().c_str());
|
|
printf("Record: %s\n", rec.toString().c_str());
|
|
printf("Decoded: %s\n", decoded.toString().c_str());
|
|
printf("deltaSize(): %d\n", expectedSize);
|
|
printf("writeDelta(): %d\n", deltaSize);
|
|
printf("d.size(): %d\n", d.size());
|
|
printf("DeltaToString: %s\n", d.toString().c_str());
|
|
printf("RedwoodRecordRef::Delta test failure!\n");
|
|
ASSERT(false);
|
|
}
|
|
|
|
return deltaSize;
|
|
}
|
|
|
|
RedwoodRecordRef randomRedwoodRecordRef(const std::string& keyBuffer, const std::string& valueBuffer) {
|
|
RedwoodRecordRef rec;
|
|
rec.key = StringRef((uint8_t*)keyBuffer.data(), deterministicRandom()->randomInt(0, keyBuffer.size()));
|
|
if (deterministicRandom()->coinflip()) {
|
|
rec.value = StringRef((uint8_t*)valueBuffer.data(), deterministicRandom()->randomInt(0, valueBuffer.size()));
|
|
}
|
|
|
|
int versionIntSize = deterministicRandom()->randomInt(0, 8) * 8;
|
|
if (versionIntSize > 0) {
|
|
--versionIntSize;
|
|
int64_t max = ((int64_t)1 << versionIntSize) - 1;
|
|
rec.version = deterministicRandom()->randomInt64(0, max);
|
|
}
|
|
|
|
return rec;
|
|
}
|
|
|
|
TEST_CASE("!/redwood/correctness/unit/RedwoodRecordRef") {
|
|
ASSERT(RedwoodRecordRef::Delta::LengthFormatSizes[0] == 3);
|
|
ASSERT(RedwoodRecordRef::Delta::LengthFormatSizes[1] == 4);
|
|
ASSERT(RedwoodRecordRef::Delta::LengthFormatSizes[2] == 6);
|
|
ASSERT(RedwoodRecordRef::Delta::LengthFormatSizes[3] == 8);
|
|
|
|
ASSERT(RedwoodRecordRef::Delta::VersionDeltaSizes[0] == 0);
|
|
ASSERT(RedwoodRecordRef::Delta::VersionDeltaSizes[1] == 4);
|
|
ASSERT(RedwoodRecordRef::Delta::VersionDeltaSizes[2] == 6);
|
|
ASSERT(RedwoodRecordRef::Delta::VersionDeltaSizes[3] == 8);
|
|
|
|
// Test pageID stuff.
|
|
{
|
|
LogicalPageID ids[] = { 1, 5 };
|
|
BTreePageIDRef id(ids, 2);
|
|
RedwoodRecordRef r;
|
|
r.setChildPage(id);
|
|
ASSERT(r.getChildPage() == id);
|
|
ASSERT(r.getChildPage().begin() == id.begin());
|
|
|
|
Standalone<RedwoodRecordRef> r2 = r;
|
|
ASSERT(r2.getChildPage() == id);
|
|
ASSERT(r2.getChildPage().begin() != id.begin());
|
|
}
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef(""), 0, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef(""), 0, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef("abc"), 0, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef("abc"), 0, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef("abc"), 0, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef("abcd"), 0, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef("abcd"), 2, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef("abc"), 2, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(std::string(300, 'k'), 2, std::string(1e6, 'v')),
|
|
RedwoodRecordRef(std::string(300, 'k'), 2, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef(""), 2, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef(""), 1, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef(""), 0xffff, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef(""), 1, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef(""), 1, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef(""), 0xffff, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef(""), 0xffffff, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef(""), 1, LiteralStringRef("")));
|
|
|
|
deltaTest(RedwoodRecordRef(LiteralStringRef(""), 1, LiteralStringRef("")),
|
|
RedwoodRecordRef(LiteralStringRef(""), 0xffffff, LiteralStringRef("")));
|
|
|
|
Arena mem;
|
|
double start;
|
|
uint64_t total;
|
|
uint64_t count;
|
|
uint64_t i;
|
|
int64_t bytes;
|
|
|
|
std::string keyBuffer(30000, 'k');
|
|
std::string valueBuffer(70000, 'v');
|
|
start = timer();
|
|
count = 1000;
|
|
bytes = 0;
|
|
for (i = 0; i < count; ++i) {
|
|
RedwoodRecordRef a = randomRedwoodRecordRef(keyBuffer, valueBuffer);
|
|
RedwoodRecordRef b = randomRedwoodRecordRef(keyBuffer, valueBuffer);
|
|
bytes += deltaTest(a, b);
|
|
}
|
|
double elapsed = timer() - start;
|
|
printf("DeltaTest() on random large records %g M/s %g MB/s\n", count / elapsed / 1e6, bytes / elapsed / 1e6);
|
|
|
|
keyBuffer.resize(30);
|
|
valueBuffer.resize(100);
|
|
start = timer();
|
|
count = 1e6;
|
|
bytes = 0;
|
|
for (i = 0; i < count; ++i) {
|
|
RedwoodRecordRef a = randomRedwoodRecordRef(keyBuffer, valueBuffer);
|
|
RedwoodRecordRef b = randomRedwoodRecordRef(keyBuffer, valueBuffer);
|
|
bytes += deltaTest(a, b);
|
|
}
|
|
printf("DeltaTest() on random small records %g M/s %g MB/s\n", count / elapsed / 1e6, bytes / elapsed / 1e6);
|
|
|
|
RedwoodRecordRef rec1;
|
|
RedwoodRecordRef rec2;
|
|
|
|
rec1.key = LiteralStringRef("alksdfjaklsdfjlkasdjflkasdjfklajsdflk;ajsdflkajdsflkjadsf1");
|
|
rec2.key = LiteralStringRef("alksdfjaklsdfjlkasdjflkasdjfklajsdflk;ajsdflkajdsflkjadsf234");
|
|
|
|
rec1.version = deterministicRandom()->randomInt64(0, std::numeric_limits<Version>::max());
|
|
rec2.version = deterministicRandom()->randomInt64(0, std::numeric_limits<Version>::max());
|
|
|
|
start = timer();
|
|
total = 0;
|
|
count = 100e6;
|
|
for (i = 0; i < count; ++i) {
|
|
total += rec1.getCommonPrefixLen(rec2, 50);
|
|
}
|
|
printf("%" PRId64 " getCommonPrefixLen(skip=50) %g M/s\n", total, count / (timer() - start) / 1e6);
|
|
|
|
start = timer();
|
|
total = 0;
|
|
count = 100e6;
|
|
for (i = 0; i < count; ++i) {
|
|
total += rec1.getCommonPrefixLen(rec2, 0);
|
|
}
|
|
printf("%" PRId64 " getCommonPrefixLen(skip=0) %g M/s\n", total, count / (timer() - start) / 1e6);
|
|
|
|
char buf[1000];
|
|
RedwoodRecordRef::Delta& d = *(RedwoodRecordRef::Delta*)buf;
|
|
|
|
start = timer();
|
|
total = 0;
|
|
count = 100e6;
|
|
int commonPrefix = rec1.getCommonPrefixLen(rec2, 0);
|
|
|
|
for (i = 0; i < count; ++i) {
|
|
total += rec1.writeDelta(d, rec2, commonPrefix);
|
|
}
|
|
printf("%" PRId64 " writeDelta(commonPrefix=%d) %g M/s\n", total, commonPrefix, count / (timer() - start) / 1e6);
|
|
|
|
start = timer();
|
|
total = 0;
|
|
count = 10e6;
|
|
for (i = 0; i < count; ++i) {
|
|
total += rec1.writeDelta(d, rec2);
|
|
}
|
|
printf("%" PRId64 " writeDelta() %g M/s\n", total, count / (timer() - start) / 1e6);
|
|
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/correctness/unit/deltaTree/RedwoodRecordRef") {
|
|
// Sanity check on delta tree node format
|
|
ASSERT(DeltaTree<RedwoodRecordRef>::Node::headerSize(false) == 4);
|
|
ASSERT(DeltaTree<RedwoodRecordRef>::Node::headerSize(true) == 8);
|
|
|
|
const int N = deterministicRandom()->randomInt(200, 1000);
|
|
|
|
RedwoodRecordRef prev;
|
|
RedwoodRecordRef next(LiteralStringRef("\xff\xff\xff\xff"));
|
|
|
|
Arena arena;
|
|
std::set<RedwoodRecordRef> uniqueItems;
|
|
|
|
// Add random items to uniqueItems until its size is N
|
|
while (uniqueItems.size() < N) {
|
|
std::string k = deterministicRandom()->randomAlphaNumeric(30);
|
|
std::string v = deterministicRandom()->randomAlphaNumeric(30);
|
|
RedwoodRecordRef rec;
|
|
rec.key = StringRef(arena, k);
|
|
rec.version = deterministicRandom()->coinflip()
|
|
? deterministicRandom()->randomInt64(0, std::numeric_limits<Version>::max())
|
|
: invalidVersion;
|
|
if (deterministicRandom()->coinflip()) {
|
|
rec.value = StringRef(arena, v);
|
|
}
|
|
if (uniqueItems.count(rec) == 0) {
|
|
uniqueItems.insert(rec);
|
|
}
|
|
}
|
|
std::vector<RedwoodRecordRef> items(uniqueItems.begin(), uniqueItems.end());
|
|
|
|
int bufferSize = N * 100;
|
|
bool largeTree = bufferSize > DeltaTree<RedwoodRecordRef>::SmallSizeLimit;
|
|
DeltaTree<RedwoodRecordRef>* tree = (DeltaTree<RedwoodRecordRef>*)new uint8_t[bufferSize];
|
|
|
|
tree->build(bufferSize, &items[0], &items[items.size()], &prev, &next);
|
|
|
|
printf("Count=%d Size=%d InitialHeight=%d largeTree=%d\n", (int)items.size(), (int)tree->size(),
|
|
(int)tree->initialHeight, largeTree);
|
|
debug_printf("Data(%p): %s\n", tree, StringRef((uint8_t*)tree, tree->size()).toHexString().c_str());
|
|
|
|
DeltaTree<RedwoodRecordRef>::Mirror r(tree, &prev, &next);
|
|
|
|
// Test delete/insert behavior for each item, making no net changes
|
|
printf("Testing seek/delete/insert for existing keys with random values\n");
|
|
ASSERT(tree->numItems == items.size());
|
|
for (auto rec : items) {
|
|
// Insert existing should fail
|
|
ASSERT(!r.insert(rec));
|
|
ASSERT(tree->numItems == items.size());
|
|
|
|
// Erase existing should succeed
|
|
ASSERT(r.erase(rec));
|
|
ASSERT(tree->numItems == items.size() - 1);
|
|
|
|
// Erase deleted should fail
|
|
ASSERT(!r.erase(rec));
|
|
ASSERT(tree->numItems == items.size() - 1);
|
|
|
|
// Insert deleted should succeed
|
|
ASSERT(r.insert(rec));
|
|
ASSERT(tree->numItems == items.size());
|
|
|
|
// Insert existing should fail
|
|
ASSERT(!r.insert(rec));
|
|
ASSERT(tree->numItems == items.size());
|
|
}
|
|
|
|
DeltaTree<RedwoodRecordRef>::Cursor fwd = r.getCursor();
|
|
DeltaTree<RedwoodRecordRef>::Cursor rev = r.getCursor();
|
|
|
|
DeltaTree<RedwoodRecordRef, RedwoodRecordRef::DeltaValueOnly>::Mirror rValuesOnly(tree, &prev, &next);
|
|
DeltaTree<RedwoodRecordRef, RedwoodRecordRef::DeltaValueOnly>::Cursor fwdValueOnly = rValuesOnly.getCursor();
|
|
|
|
printf("Verifying tree contents using forward, reverse, and value-only iterators\n");
|
|
ASSERT(fwd.moveFirst());
|
|
ASSERT(fwdValueOnly.moveFirst());
|
|
ASSERT(rev.moveLast());
|
|
|
|
int i = 0;
|
|
while (1) {
|
|
if (fwd.get() != items[i]) {
|
|
printf("forward iterator i=%d\n %s found\n %s expected\n", i, fwd.get().toString().c_str(),
|
|
items[i].toString().c_str());
|
|
printf("Delta: %s\n", fwd.node->raw->delta(largeTree).toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
if (rev.get() != items[items.size() - 1 - i]) {
|
|
printf("reverse iterator i=%d\n %s found\n %s expected\n", i, rev.get().toString().c_str(),
|
|
items[items.size() - 1 - i].toString().c_str());
|
|
printf("Delta: %s\n", rev.node->raw->delta(largeTree).toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
if (fwdValueOnly.get().value != items[i].value) {
|
|
printf("forward values-only iterator i=%d\n %s found\n %s expected\n", i,
|
|
fwdValueOnly.get().toString().c_str(), items[i].toString().c_str());
|
|
printf("Delta: %s\n", fwdValueOnly.node->raw->delta(largeTree).toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
++i;
|
|
|
|
bool more = fwd.moveNext();
|
|
ASSERT(fwdValueOnly.moveNext() == more);
|
|
ASSERT(rev.movePrev() == more);
|
|
|
|
ASSERT(fwd.valid() == more);
|
|
ASSERT(fwdValueOnly.valid() == more);
|
|
ASSERT(rev.valid() == more);
|
|
|
|
if (!fwd.valid()) {
|
|
break;
|
|
}
|
|
}
|
|
ASSERT(i == items.size());
|
|
|
|
{
|
|
DeltaTree<RedwoodRecordRef>::Mirror mirror(tree, &prev, &next);
|
|
DeltaTree<RedwoodRecordRef>::Cursor c = mirror.getCursor();
|
|
|
|
printf("Doing 20M random seeks using the same cursor from the same mirror.\n");
|
|
double start = timer();
|
|
|
|
for (int i = 0; i < 20000000; ++i) {
|
|
const RedwoodRecordRef& query = items[deterministicRandom()->randomInt(0, items.size())];
|
|
if (!c.seekLessThanOrEqual(query)) {
|
|
printf("Not found! query=%s\n", query.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
if (c.get() != query) {
|
|
printf("Found incorrect node! query=%s found=%s\n", query.toString().c_str(),
|
|
c.get().toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
double elapsed = timer() - start;
|
|
printf("Elapsed %f\n", elapsed);
|
|
}
|
|
|
|
{
|
|
printf("Doing 5M random seeks using 10k random cursors, each from a different mirror.\n");
|
|
double start = timer();
|
|
std::vector<DeltaTree<RedwoodRecordRef>::Mirror*> mirrors;
|
|
std::vector<DeltaTree<RedwoodRecordRef>::Cursor> cursors;
|
|
for (int i = 0; i < 10000; ++i) {
|
|
mirrors.push_back(new DeltaTree<RedwoodRecordRef>::Mirror(tree, &prev, &next));
|
|
cursors.push_back(mirrors.back()->getCursor());
|
|
}
|
|
|
|
for (int i = 0; i < 5000000; ++i) {
|
|
const RedwoodRecordRef& query = items[deterministicRandom()->randomInt(0, items.size())];
|
|
DeltaTree<RedwoodRecordRef>::Cursor& c = cursors[deterministicRandom()->randomInt(0, cursors.size())];
|
|
if (!c.seekLessThanOrEqual(query)) {
|
|
printf("Not found! query=%s\n", query.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
if (c.get() != query) {
|
|
printf("Found incorrect node! query=%s found=%s\n", query.toString().c_str(),
|
|
c.get().toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
double elapsed = timer() - start;
|
|
printf("Elapsed %f\n", elapsed);
|
|
}
|
|
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/correctness/unit/deltaTree/IntIntPair") {
|
|
const int N = 200;
|
|
IntIntPair prev = { 1, 0 };
|
|
IntIntPair next = { 10000, 10000 };
|
|
|
|
state std::function<IntIntPair()> randomPair = [&]() {
|
|
return IntIntPair(
|
|
{ deterministicRandom()->randomInt(prev.k, next.k), deterministicRandom()->randomInt(prev.v, next.v) });
|
|
};
|
|
|
|
// Build a set of N unique items
|
|
std::set<IntIntPair> uniqueItems;
|
|
while (uniqueItems.size() < N) {
|
|
IntIntPair p = randomPair();
|
|
if (uniqueItems.count(p) == 0) {
|
|
uniqueItems.insert(p);
|
|
}
|
|
}
|
|
|
|
// Build tree of items
|
|
std::vector<IntIntPair> items(uniqueItems.begin(), uniqueItems.end());
|
|
int bufferSize = N * 2 * 20;
|
|
DeltaTree<IntIntPair>* tree = (DeltaTree<IntIntPair>*)new uint8_t[bufferSize];
|
|
int builtSize = tree->build(bufferSize, &items[0], &items[items.size()], &prev, &next);
|
|
ASSERT(builtSize <= bufferSize);
|
|
|
|
DeltaTree<IntIntPair>::Mirror r(tree, &prev, &next);
|
|
|
|
// Grow uniqueItems until tree is full, adding half of new items to toDelete
|
|
std::vector<IntIntPair> toDelete;
|
|
while (1) {
|
|
IntIntPair p = randomPair();
|
|
if (uniqueItems.count(p) == 0) {
|
|
if (!r.insert(p)) {
|
|
break;
|
|
};
|
|
uniqueItems.insert(p);
|
|
if (deterministicRandom()->coinflip()) {
|
|
toDelete.push_back(p);
|
|
}
|
|
// printf("Inserted %s size=%d\n", items.back().toString().c_str(), tree->size());
|
|
}
|
|
}
|
|
|
|
ASSERT(tree->numItems > 2 * N);
|
|
ASSERT(tree->size() <= bufferSize);
|
|
|
|
// Update items vector
|
|
items = std::vector<IntIntPair>(uniqueItems.begin(), uniqueItems.end());
|
|
|
|
auto printItems = [&] {
|
|
for (int k = 0; k < items.size(); ++k) {
|
|
printf("%d %s\n", k, items[k].toString().c_str());
|
|
}
|
|
};
|
|
|
|
printf("Count=%d Size=%d InitialHeight=%d MaxHeight=%d\n", (int)items.size(), (int)tree->size(),
|
|
(int)tree->initialHeight, (int)tree->maxHeight);
|
|
debug_printf("Data(%p): %s\n", tree, StringRef((uint8_t*)tree, tree->size()).toHexString().c_str());
|
|
|
|
// Iterate through items and tree forward and backward, verifying tree contents.
|
|
auto scanAndVerify = [&]() {
|
|
printf("Verify tree contents.\n");
|
|
|
|
DeltaTree<IntIntPair>::Cursor fwd = r.getCursor();
|
|
DeltaTree<IntIntPair>::Cursor rev = r.getCursor();
|
|
ASSERT(fwd.moveFirst());
|
|
ASSERT(rev.moveLast());
|
|
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
if (fwd.get() != items[i]) {
|
|
printItems();
|
|
printf("forward iterator i=%d\n %s found\n %s expected\n", i, fwd.get().toString().c_str(),
|
|
items[i].toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
if (rev.get() != items[items.size() - 1 - i]) {
|
|
printItems();
|
|
printf("reverse iterator i=%d\n %s found\n %s expected\n", i, rev.get().toString().c_str(),
|
|
items[items.size() - 1 - i].toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
|
|
// Advance iterator, check scanning cursors for correct validity state
|
|
int j = i + 1;
|
|
bool end = j == items.size();
|
|
|
|
ASSERT(fwd.moveNext() == !end);
|
|
ASSERT(rev.movePrev() == !end);
|
|
ASSERT(fwd.valid() == !end);
|
|
ASSERT(rev.valid() == !end);
|
|
|
|
if (end) {
|
|
break;
|
|
}
|
|
}
|
|
};
|
|
|
|
// Verify tree contents
|
|
scanAndVerify();
|
|
|
|
// Create a new mirror, decoding the tree from scratch since insert() modified both the tree and the mirror
|
|
r = DeltaTree<IntIntPair>::Mirror(tree, &prev, &next);
|
|
scanAndVerify();
|
|
|
|
// For each randomly selected new item to be deleted, delete it from the DeltaTree and from uniqueItems
|
|
printf("Deleting some items\n");
|
|
for (auto p : toDelete) {
|
|
uniqueItems.erase(p);
|
|
DeltaTree<IntIntPair>::Cursor c = r.getCursor();
|
|
ASSERT(c.seekLessThanOrEqual(p));
|
|
c.erase();
|
|
}
|
|
// Update items vector
|
|
items = std::vector<IntIntPair>(uniqueItems.begin(), uniqueItems.end());
|
|
|
|
// Verify tree contents after deletions
|
|
scanAndVerify();
|
|
|
|
printf("Verifying insert/erase behavior for existing items\n");
|
|
// Test delete/insert behavior for each item, making no net changes
|
|
for (auto p : items) {
|
|
// Insert existing should fail
|
|
ASSERT(!r.insert(p));
|
|
|
|
// Erase existing should succeed
|
|
ASSERT(r.erase(p));
|
|
|
|
// Erase deleted should fail
|
|
ASSERT(!r.erase(p));
|
|
|
|
// Insert deleted should succeed
|
|
ASSERT(r.insert(p));
|
|
|
|
// Insert existing should fail
|
|
ASSERT(!r.insert(p));
|
|
}
|
|
|
|
// Tree contents should still match items vector
|
|
scanAndVerify();
|
|
|
|
printf("Verifying seek behaviors\n");
|
|
DeltaTree<IntIntPair>::Cursor s = r.getCursor();
|
|
|
|
// SeekLTE to each element
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
IntIntPair p = items[i];
|
|
IntIntPair q = p;
|
|
ASSERT(s.seekLessThanOrEqual(q));
|
|
if (s.get() != p) {
|
|
printItems();
|
|
printf("seekLessThanOrEqual(%s) found %s expected %s\n", q.toString().c_str(), s.get().toString().c_str(),
|
|
p.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
|
|
// SeekGTE to each element
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
IntIntPair p = items[i];
|
|
IntIntPair q = p;
|
|
ASSERT(s.seekGreaterThanOrEqual(q));
|
|
if (s.get() != p) {
|
|
printItems();
|
|
printf("seekGreaterThanOrEqual(%s) found %s expected %s\n", q.toString().c_str(),
|
|
s.get().toString().c_str(), p.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
|
|
// SeekLTE to the next possible int pair value after each element to make sure the base element is found
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
IntIntPair p = items[i];
|
|
IntIntPair q = p;
|
|
q.v++;
|
|
ASSERT(s.seekLessThanOrEqual(q));
|
|
if (s.get() != p) {
|
|
printItems();
|
|
printf("seekLessThanOrEqual(%s) found %s expected %s\n", q.toString().c_str(), s.get().toString().c_str(),
|
|
p.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
|
|
// SeekGTE to the previous possible int pair value after each element to make sure the base element is found
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
IntIntPair p = items[i];
|
|
IntIntPair q = p;
|
|
q.v--;
|
|
ASSERT(s.seekGreaterThanOrEqual(q));
|
|
if (s.get() != p) {
|
|
printItems();
|
|
printf("seekGreaterThanOrEqual(%s) found %s expected %s\n", q.toString().c_str(),
|
|
s.get().toString().c_str(), p.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
|
|
// SeekLTE to each element N times, using every element as a hint
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
IntIntPair p = items[i];
|
|
IntIntPair q = p;
|
|
for (int j = 0; j < items.size(); ++j) {
|
|
ASSERT(s.seekLessThanOrEqual(items[j]));
|
|
ASSERT(s.seekLessThanOrEqual(q, 0, &s));
|
|
if (s.get() != p) {
|
|
printItems();
|
|
printf("i=%d j=%d\n", i, j);
|
|
printf("seekLessThanOrEqual(%s) found %s expected %s\n", q.toString().c_str(),
|
|
s.get().toString().c_str(), p.toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
// SeekLTE to each element's next possible value, using each element as a hint
|
|
for (int i = 0; i < items.size(); ++i) {
|
|
IntIntPair p = items[i];
|
|
IntIntPair q = p;
|
|
q.v++;
|
|
for (int j = 0; j < items.size(); ++j) {
|
|
ASSERT(s.seekLessThanOrEqual(items[j]));
|
|
ASSERT(s.seekLessThanOrEqual(q, 0, &s));
|
|
if (s.get() != p) {
|
|
printItems();
|
|
printf("i=%d j=%d\n", i, j);
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
auto skipSeekPerformance = [&](int jumpMax, bool old, bool useHint, int count) {
|
|
// Skip to a series of increasing items, jump by up to jumpMax units forward in the
|
|
// items, wrapping around to 0.
|
|
double start = timer();
|
|
s.moveFirst();
|
|
auto first = s;
|
|
int pos = 0;
|
|
for (int c = 0; c < count; ++c) {
|
|
int jump = deterministicRandom()->randomInt(0, jumpMax);
|
|
int newPos = pos + jump;
|
|
if (newPos >= items.size()) {
|
|
pos = 0;
|
|
newPos = jump;
|
|
s = first;
|
|
}
|
|
IntIntPair q = items[newPos];
|
|
++q.v;
|
|
if (old) {
|
|
if (useHint) {
|
|
s.seekLessThanOrEqualOld(q, 0, &s, newPos - pos);
|
|
} else {
|
|
s.seekLessThanOrEqualOld(q, 0, nullptr, 0);
|
|
}
|
|
} else {
|
|
if (useHint) {
|
|
s.seekLessThanOrEqual(q, 0, &s, newPos - pos);
|
|
} else {
|
|
s.seekLessThanOrEqual(q);
|
|
}
|
|
}
|
|
pos = newPos;
|
|
}
|
|
double elapsed = timer() - start;
|
|
printf("Seek/skip test, jumpMax=%d, items=%d, oldSeek=%d useHint=%d: Elapsed %f s\n", jumpMax, items.size(),
|
|
old, useHint, elapsed);
|
|
};
|
|
|
|
// Compare seeking to nearby elements with and without hints, using the old and new SeekLessThanOrEqual methods.
|
|
// TODO: Once seekLessThanOrEqual() with a hint is as fast as seekLessThanOrEqualOld, remove it.
|
|
skipSeekPerformance(8, true, false, 80e6);
|
|
skipSeekPerformance(8, true, true, 80e6);
|
|
skipSeekPerformance(8, false, false, 80e6);
|
|
skipSeekPerformance(8, false, true, 80e6);
|
|
|
|
// Repeatedly seek for one of a set of pregenerated random pairs and time it.
|
|
std::vector<IntIntPair> randomPairs;
|
|
for (int i = 0; i < 10 * N; ++i) {
|
|
randomPairs.push_back(randomPair());
|
|
}
|
|
|
|
// Random seeks
|
|
double start = timer();
|
|
for (int i = 0; i < 20000000; ++i) {
|
|
IntIntPair p = randomPairs[i % randomPairs.size()];
|
|
// Verify the result is less than or equal, and if seek fails then p must be lower than lowest (first) item
|
|
if (!s.seekLessThanOrEqual(p)) {
|
|
if (p >= items.front()) {
|
|
printf("Seek failed! query=%s front=%s\n", p.toString().c_str(), items.front().toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
} else if (s.get() > p) {
|
|
printf("Found incorrect node! query=%s found=%s\n", p.toString().c_str(), s.get().toString().c_str());
|
|
ASSERT(false);
|
|
}
|
|
}
|
|
double elapsed = timer() - start;
|
|
printf("Random seek test: Elapsed %f\n", elapsed);
|
|
|
|
return Void();
|
|
}
|
|
|
|
struct SimpleCounter {
|
|
SimpleCounter() : x(0), xt(0), t(timer()), start(t) {}
|
|
void operator+=(int n) { x += n; }
|
|
void operator++() { x++; }
|
|
int64_t get() { return x; }
|
|
double rate() {
|
|
double t2 = timer();
|
|
int r = (x - xt) / (t2 - t);
|
|
xt = x;
|
|
t = t2;
|
|
return r;
|
|
}
|
|
double avgRate() { return x / (timer() - start); }
|
|
int64_t x;
|
|
double t;
|
|
double start;
|
|
int64_t xt;
|
|
std::string toString() { return format("%" PRId64 "/%.2f/%.2f", x, rate() / 1e6, avgRate() / 1e6); }
|
|
};
|
|
|
|
TEST_CASE("!/redwood/performance/mutationBuffer") {
|
|
// This test uses pregenerated short random keys
|
|
int count = 10e6;
|
|
|
|
printf("Generating %d strings...\n", count);
|
|
Arena arena;
|
|
std::vector<KeyRef> strings;
|
|
while (strings.size() < count) {
|
|
strings.push_back(randomString(arena, 5));
|
|
}
|
|
|
|
printf("Inserting and then finding each string...\n", count);
|
|
double start = timer();
|
|
VersionedBTree::MutationBuffer m;
|
|
for (int i = 0; i < count; ++i) {
|
|
KeyRef key = strings[i];
|
|
auto a = m.insert(key);
|
|
auto b = m.lower_bound(key);
|
|
ASSERT(a == b);
|
|
m.erase(a, b);
|
|
}
|
|
|
|
double elapsed = timer() - start;
|
|
printf("count=%d elapsed=%f\n", count, elapsed);
|
|
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/correctness/btree") {
|
|
g_redwoodMetricsActor = Void(); // Prevent trace event metrics from starting
|
|
g_redwoodMetrics.clear();
|
|
|
|
state std::string pagerFile = "unittest_pageFile.redwood";
|
|
IPager2* pager;
|
|
|
|
state bool serialTest = deterministicRandom()->coinflip();
|
|
state bool shortTest = deterministicRandom()->coinflip();
|
|
|
|
state int pageSize =
|
|
shortTest ? 200 : (deterministicRandom()->coinflip() ? 4096 : deterministicRandom()->randomInt(200, 400));
|
|
|
|
state int64_t targetPageOps = shortTest ? 50000 : 1000000;
|
|
state bool pagerMemoryOnly = shortTest && (deterministicRandom()->random01() < .01);
|
|
state int maxKeySize = deterministicRandom()->randomInt(1, pageSize * 2);
|
|
state int maxValueSize = randomSize(pageSize * 25);
|
|
state int maxCommitSize = shortTest ? 1000 : randomSize(std::min<int>((maxKeySize + maxValueSize) * 20000, 10e6));
|
|
state double clearProbability = deterministicRandom()->random01() * .1;
|
|
state double clearSingleKeyProbability = deterministicRandom()->random01();
|
|
state double clearPostSetProbability = deterministicRandom()->random01() * .1;
|
|
state double coldStartProbability = pagerMemoryOnly ? 0 : (deterministicRandom()->random01() * 0.3);
|
|
state double advanceOldVersionProbability = deterministicRandom()->random01();
|
|
state int64_t cacheSizeBytes =
|
|
pagerMemoryOnly ? 2e9 : (BUGGIFY ? deterministicRandom()->randomInt(1, 10 * pageSize) : 0);
|
|
state Version versionIncrement = deterministicRandom()->randomInt64(1, 1e8);
|
|
state Version remapCleanupWindow = deterministicRandom()->randomInt64(0, versionIncrement * 50);
|
|
state int maxVerificationMapEntries = 300e3;
|
|
|
|
printf("\n");
|
|
printf("targetPageOps: %" PRId64 "\n", targetPageOps);
|
|
printf("pagerMemoryOnly: %d\n", pagerMemoryOnly);
|
|
printf("serialTest: %d\n", serialTest);
|
|
printf("shortTest: %d\n", shortTest);
|
|
printf("pageSize: %d\n", pageSize);
|
|
printf("maxKeySize: %d\n", maxKeySize);
|
|
printf("maxValueSize: %d\n", maxValueSize);
|
|
printf("maxCommitSize: %d\n", maxCommitSize);
|
|
printf("clearProbability: %f\n", clearProbability);
|
|
printf("clearSingleKeyProbability: %f\n", clearSingleKeyProbability);
|
|
printf("clearPostSetProbability: %f\n", clearPostSetProbability);
|
|
printf("coldStartProbability: %f\n", coldStartProbability);
|
|
printf("advanceOldVersionProbability: %f\n", advanceOldVersionProbability);
|
|
printf("cacheSizeBytes: %s\n", cacheSizeBytes == 0 ? "default" : format("%" PRId64, cacheSizeBytes).c_str());
|
|
printf("versionIncrement: %" PRId64 "\n", versionIncrement);
|
|
printf("remapCleanupWindow: %" PRId64 "\n", remapCleanupWindow);
|
|
printf("maxVerificationMapEntries: %d\n", maxVerificationMapEntries);
|
|
printf("\n");
|
|
|
|
printf("Deleting existing test data...\n");
|
|
deleteFile(pagerFile);
|
|
|
|
printf("Initializing...\n");
|
|
pager = new DWALPager(pageSize, pagerFile, cacheSizeBytes, remapCleanupWindow, pagerMemoryOnly);
|
|
state VersionedBTree* btree = new VersionedBTree(pager, pagerFile);
|
|
wait(btree->init());
|
|
|
|
state std::map<std::pair<std::string, Version>, Optional<std::string>> written;
|
|
state std::set<Key> keys;
|
|
|
|
state Version lastVer = btree->getLatestVersion();
|
|
printf("Starting from version: %" PRId64 "\n", lastVer);
|
|
|
|
state Version version = lastVer + 1;
|
|
btree->setWriteVersion(version);
|
|
|
|
state SimpleCounter mutationBytes;
|
|
state SimpleCounter keyBytesInserted;
|
|
state SimpleCounter valueBytesInserted;
|
|
state SimpleCounter sets;
|
|
state SimpleCounter rangeClears;
|
|
state SimpleCounter keyBytesCleared;
|
|
state int errorCount;
|
|
state int mutationBytesThisCommit = 0;
|
|
state int mutationBytesTargetThisCommit = randomSize(maxCommitSize);
|
|
|
|
state PromiseStream<Version> committedVersions;
|
|
state Future<Void> verifyTask = verify(btree, committedVersions.getFuture(), &written, &errorCount, serialTest);
|
|
state Future<Void> randomTask = serialTest ? Void() : (randomReader(btree) || btree->getError());
|
|
committedVersions.send(lastVer);
|
|
|
|
state Future<Void> commit = Void();
|
|
state int64_t totalPageOps = 0;
|
|
|
|
while (totalPageOps < targetPageOps && written.size() < maxVerificationMapEntries) {
|
|
// Sometimes increment the version
|
|
if (deterministicRandom()->random01() < 0.10) {
|
|
++version;
|
|
btree->setWriteVersion(version);
|
|
}
|
|
|
|
// Sometimes do a clear range
|
|
if (deterministicRandom()->random01() < clearProbability) {
|
|
Key start = randomKV(maxKeySize, 1).key;
|
|
Key end = (deterministicRandom()->random01() < .01) ? keyAfter(start) : randomKV(maxKeySize, 1).key;
|
|
|
|
// Sometimes replace start and/or end with a close actual (previously used) value
|
|
if (deterministicRandom()->random01() < .10) {
|
|
auto i = keys.upper_bound(start);
|
|
if (i != keys.end()) start = *i;
|
|
}
|
|
if (deterministicRandom()->random01() < .10) {
|
|
auto i = keys.upper_bound(end);
|
|
if (i != keys.end()) end = *i;
|
|
}
|
|
|
|
// Do a single key clear based on probability or end being randomly chosen to be the same as begin
|
|
// (unlikely)
|
|
if (deterministicRandom()->random01() < clearSingleKeyProbability || end == start) {
|
|
end = keyAfter(start);
|
|
} else if (end < start) {
|
|
std::swap(end, start);
|
|
}
|
|
|
|
// Apply clear range to verification map
|
|
++rangeClears;
|
|
KeyRangeRef range(start, end);
|
|
debug_printf(" Mutation: Clear '%s' to '%s' @%" PRId64 "\n", start.toString().c_str(),
|
|
end.toString().c_str(), version);
|
|
auto e = written.lower_bound(std::make_pair(start.toString(), 0));
|
|
if (e != written.end()) {
|
|
auto last = e;
|
|
auto eEnd = written.lower_bound(std::make_pair(end.toString(), 0));
|
|
while (e != eEnd) {
|
|
auto w = *e;
|
|
++e;
|
|
// If e key is different from last and last was present then insert clear for last's key at version
|
|
if (last != eEnd &&
|
|
((e == eEnd || e->first.first != last->first.first) && last->second.present())) {
|
|
debug_printf(" Mutation: Clearing key '%s' @%" PRId64 "\n", last->first.first.c_str(),
|
|
version);
|
|
|
|
keyBytesCleared += last->first.first.size();
|
|
mutationBytes += last->first.first.size();
|
|
mutationBytesThisCommit += last->first.first.size();
|
|
|
|
// If the last set was at version then just make it not present
|
|
if (last->first.second == version) {
|
|
last->second.reset();
|
|
} else {
|
|
written[std::make_pair(last->first.first, version)].reset();
|
|
}
|
|
}
|
|
last = e;
|
|
}
|
|
}
|
|
|
|
btree->clear(range);
|
|
|
|
// Sometimes set the range start after the clear
|
|
if (deterministicRandom()->random01() < clearPostSetProbability) {
|
|
KeyValue kv = randomKV(0, maxValueSize);
|
|
kv.key = range.begin;
|
|
btree->set(kv);
|
|
written[std::make_pair(kv.key.toString(), version)] = kv.value.toString();
|
|
}
|
|
} else {
|
|
// Set a key
|
|
KeyValue kv = randomKV(maxKeySize, maxValueSize);
|
|
// Sometimes change key to a close previously used key
|
|
if (deterministicRandom()->random01() < .01) {
|
|
auto i = keys.upper_bound(kv.key);
|
|
if (i != keys.end()) kv.key = StringRef(kv.arena(), *i);
|
|
}
|
|
|
|
debug_printf(" Mutation: Set '%s' -> '%s' @%" PRId64 "\n", kv.key.toString().c_str(),
|
|
kv.value.toString().c_str(), version);
|
|
|
|
++sets;
|
|
keyBytesInserted += kv.key.size();
|
|
valueBytesInserted += kv.value.size();
|
|
mutationBytes += (kv.key.size() + kv.value.size());
|
|
mutationBytesThisCommit += (kv.key.size() + kv.value.size());
|
|
|
|
btree->set(kv);
|
|
written[std::make_pair(kv.key.toString(), version)] = kv.value.toString();
|
|
keys.insert(kv.key);
|
|
}
|
|
|
|
// Commit after any limits for this commit or the total test are reached
|
|
if (totalPageOps >= targetPageOps || written.size() >= maxVerificationMapEntries || mutationBytesThisCommit >= mutationBytesTargetThisCommit) {
|
|
// Wait for previous commit to finish
|
|
wait(commit);
|
|
printf("Committed. Next commit %d bytes, %" PRId64 " bytes.", mutationBytesThisCommit, mutationBytes.get());
|
|
printf(" Stats: Insert %.2f MB/s ClearedKeys %.2f MB/s Total %.2f\n",
|
|
(keyBytesInserted.rate() + valueBytesInserted.rate()) / 1e6, keyBytesCleared.rate() / 1e6,
|
|
mutationBytes.rate() / 1e6);
|
|
|
|
Version v = version; // Avoid capture of version as a member of *this
|
|
|
|
// Sometimes advance the oldest version to close the gap between the oldest and latest versions by a random
|
|
// amount.
|
|
if (deterministicRandom()->random01() < advanceOldVersionProbability) {
|
|
btree->setOldestVersion(btree->getLastCommittedVersion() -
|
|
deterministicRandom()->randomInt64(0, btree->getLastCommittedVersion() -
|
|
btree->getOldestVersion() + 1));
|
|
}
|
|
|
|
commit = map(btree->commit(), [=,&ops=totalPageOps](Void) {
|
|
// Update pager ops before clearing metrics
|
|
ops += g_redwoodMetrics.pageOps();
|
|
printf("PageOps %" PRId64 "/%" PRId64 " (%.2f%%) VerificationMapEntries %d/%d (%.2f%%)\n",
|
|
ops, targetPageOps, ops * 100.0 / targetPageOps,
|
|
written.size(), maxVerificationMapEntries, written.size() * 100.0 / maxVerificationMapEntries);
|
|
printf("Committed:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
// Notify the background verifier that version is committed and therefore readable
|
|
committedVersions.send(v);
|
|
return Void();
|
|
});
|
|
|
|
if (serialTest) {
|
|
// Wait for commit, wait for verification, then start new verification
|
|
wait(commit);
|
|
committedVersions.sendError(end_of_stream());
|
|
debug_printf("Waiting for verification to complete.\n");
|
|
wait(verifyTask);
|
|
committedVersions = PromiseStream<Version>();
|
|
verifyTask = verify(btree, committedVersions.getFuture(), &written, &errorCount, serialTest);
|
|
}
|
|
|
|
mutationBytesThisCommit = 0;
|
|
mutationBytesTargetThisCommit = randomSize(maxCommitSize);
|
|
|
|
// Recover from disk at random
|
|
if (!serialTest && deterministicRandom()->random01() < coldStartProbability) {
|
|
printf("Recovering from disk after next commit.\n");
|
|
|
|
// Wait for outstanding commit
|
|
debug_printf("Waiting for outstanding commit\n");
|
|
wait(commit);
|
|
|
|
// Stop and wait for the verifier task
|
|
committedVersions.sendError(end_of_stream());
|
|
debug_printf("Waiting for verification to complete.\n");
|
|
wait(verifyTask);
|
|
|
|
debug_printf("Closing btree\n");
|
|
Future<Void> closedFuture = btree->onClosed();
|
|
btree->close();
|
|
wait(closedFuture);
|
|
|
|
printf("Reopening btree from disk.\n");
|
|
IPager2* pager = new DWALPager(pageSize, pagerFile, cacheSizeBytes, remapCleanupWindow);
|
|
btree = new VersionedBTree(pager, pagerFile);
|
|
wait(btree->init());
|
|
|
|
Version v = btree->getLatestVersion();
|
|
ASSERT(v == version);
|
|
printf("Recovered from disk. Latest version %" PRId64 "\n", v);
|
|
|
|
// Create new promise stream and start the verifier again
|
|
committedVersions = PromiseStream<Version>();
|
|
verifyTask = verify(btree, committedVersions.getFuture(), &written, &errorCount, serialTest);
|
|
randomTask = randomReader(btree) || btree->getError();
|
|
committedVersions.send(v);
|
|
}
|
|
|
|
version += versionIncrement;
|
|
btree->setWriteVersion(version);
|
|
}
|
|
|
|
// Check for errors
|
|
ASSERT(errorCount == 0);
|
|
}
|
|
|
|
debug_printf("Waiting for outstanding commit\n");
|
|
wait(commit);
|
|
committedVersions.sendError(end_of_stream());
|
|
randomTask.cancel();
|
|
debug_printf("Waiting for verification to complete.\n");
|
|
wait(verifyTask);
|
|
|
|
// Check for errors
|
|
ASSERT(errorCount == 0);
|
|
|
|
// Reopen pager and btree with a remap cleanup window of 0 to reclaim all old pages
|
|
state Future<Void> closedFuture = btree->onClosed();
|
|
btree->close();
|
|
wait(closedFuture);
|
|
btree = new VersionedBTree(new DWALPager(pageSize, pagerFile, cacheSizeBytes, 0), pagerFile);
|
|
wait(btree->init());
|
|
|
|
wait(btree->clearAllAndCheckSanity());
|
|
|
|
closedFuture = btree->onClosed();
|
|
btree->close();
|
|
debug_printf("Closing.\n");
|
|
wait(closedFuture);
|
|
|
|
return Void();
|
|
}
|
|
|
|
ACTOR Future<Void> randomSeeks(VersionedBTree* btree, int count, char firstChar, char lastChar) {
|
|
state Version readVer = btree->getLatestVersion();
|
|
state int c = 0;
|
|
state double readStart = timer();
|
|
printf("Executing %d random seeks\n", count);
|
|
state Reference<IStoreCursor> cur = btree->readAtVersion(readVer);
|
|
while (c < count) {
|
|
state Key k = randomString(20, firstChar, lastChar);
|
|
wait(success(cur->findFirstEqualOrGreater(k)));
|
|
++c;
|
|
}
|
|
double elapsed = timer() - readStart;
|
|
printf("Random seek speed %d/s\n", int(count / elapsed));
|
|
return Void();
|
|
}
|
|
|
|
ACTOR Future<Void> randomScans(VersionedBTree* btree, int count, int width, int readAhead, char firstChar,
|
|
char lastChar) {
|
|
state Version readVer = btree->getLatestVersion();
|
|
state int c = 0;
|
|
state double readStart = timer();
|
|
printf("Executing %d random scans\n", count);
|
|
state Reference<IStoreCursor> cur = btree->readAtVersion(readVer);
|
|
state bool adaptive = readAhead < 0;
|
|
state int totalScanBytes = 0;
|
|
while (c++ < count) {
|
|
state Key k = randomString(20, firstChar, lastChar);
|
|
wait(success(cur->findFirstEqualOrGreater(k, readAhead)));
|
|
if (adaptive) {
|
|
readAhead = totalScanBytes / c;
|
|
}
|
|
state int w = width;
|
|
while (w > 0 && cur->isValid()) {
|
|
totalScanBytes += cur->getKey().size();
|
|
totalScanBytes += cur->getValue().size();
|
|
wait(cur->next());
|
|
--w;
|
|
}
|
|
}
|
|
double elapsed = timer() - readStart;
|
|
printf("Completed %d scans: readAhead=%d width=%d bytesRead=%d scansRate=%d/s\n", count, readAhead, width,
|
|
totalScanBytes, int(count / elapsed));
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/correctness/pager/cow") {
|
|
state std::string pagerFile = "unittest_pageFile.redwood";
|
|
printf("Deleting old test data\n");
|
|
deleteFile(pagerFile);
|
|
|
|
int pageSize = 4096;
|
|
state IPager2* pager = new DWALPager(pageSize, pagerFile, 0, 0);
|
|
|
|
wait(success(pager->init()));
|
|
state LogicalPageID id = wait(pager->newPageID());
|
|
Reference<IPage> p = pager->newPageBuffer();
|
|
memset(p->mutate(), (char)id, p->size());
|
|
pager->updatePage(id, p);
|
|
pager->setMetaKey(LiteralStringRef("asdfasdf"));
|
|
wait(pager->commit());
|
|
Reference<IPage> p2 = wait(pager->readPage(id, true));
|
|
printf("%s\n", StringRef(p2->begin(), p2->size()).toHexString().c_str());
|
|
|
|
// TODO: Verify reads, do more writes and reads to make this a real pager validator
|
|
|
|
Future<Void> onClosed = pager->onClosed();
|
|
pager->close();
|
|
wait(onClosed);
|
|
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/performance/set") {
|
|
state SignalableActorCollection actors;
|
|
|
|
g_redwoodMetricsActor = Void(); // Prevent trace event metrics from starting
|
|
g_redwoodMetrics.clear();
|
|
|
|
// If a test file is passed in by environment then don't write new data to it.
|
|
state bool reload = getenv("TESTFILE") == nullptr;
|
|
state std::string pagerFile = reload ? "unittest.redwood" : getenv("TESTFILE");
|
|
|
|
if (reload) {
|
|
printf("Deleting old test data\n");
|
|
deleteFile(pagerFile);
|
|
}
|
|
|
|
state int pageSize = SERVER_KNOBS->REDWOOD_DEFAULT_PAGE_SIZE;
|
|
state int64_t pageCacheBytes = FLOW_KNOBS->PAGE_CACHE_4K;
|
|
state int nodeCount = 1e9;
|
|
state int maxRecordsPerCommit = 20000;
|
|
state int maxKVBytesPerCommit = 20e6;
|
|
state int64_t kvBytesTarget = 4e9;
|
|
state int minKeyPrefixBytes = 25;
|
|
state int maxKeyPrefixBytes = 25;
|
|
state int minValueSize = 100;
|
|
state int maxValueSize = 500;
|
|
state int minConsecutiveRun = 1;
|
|
state int maxConsecutiveRun = 100000;
|
|
state char firstKeyChar = 'a';
|
|
state char lastKeyChar = 'm';
|
|
state Version remapCleanupWindow = SERVER_KNOBS->REDWOOD_REMAP_CLEANUP_WINDOW;
|
|
|
|
printf("pageSize: %d\n", pageSize);
|
|
printf("pageCacheBytes: %" PRId64 "\n", pageCacheBytes);
|
|
printf("trailingIntegerIndexRange: %d\n", nodeCount);
|
|
printf("maxChangesPerCommit: %d\n", maxRecordsPerCommit);
|
|
printf("minKeyPrefixBytes: %d\n", minKeyPrefixBytes);
|
|
printf("maxKeyPrefixBytes: %d\n", maxKeyPrefixBytes);
|
|
printf("minConsecutiveRun: %d\n", minConsecutiveRun);
|
|
printf("maxConsecutiveRun: %d\n", maxConsecutiveRun);
|
|
printf("minValueSize: %d\n", minValueSize);
|
|
printf("maxValueSize: %d\n", maxValueSize);
|
|
printf("maxCommitSize: %d\n", maxKVBytesPerCommit);
|
|
printf("kvBytesTarget: %" PRId64 "\n", kvBytesTarget);
|
|
printf("KeyLexicon '%c' to '%c'\n", firstKeyChar, lastKeyChar);
|
|
printf("remapCleanupWindow: %" PRId64 "\n", remapCleanupWindow);
|
|
|
|
DWALPager* pager = new DWALPager(pageSize, pagerFile, pageCacheBytes, remapCleanupWindow);
|
|
state VersionedBTree* btree = new VersionedBTree(pager, pagerFile);
|
|
wait(btree->init());
|
|
|
|
state int64_t kvBytesThisCommit = 0;
|
|
state int64_t kvBytesTotal = 0;
|
|
state int recordsThisCommit = 0;
|
|
state Future<Void> commit = Void();
|
|
state std::string value(maxValueSize, 'v');
|
|
|
|
printf("Starting.\n");
|
|
state double intervalStart = timer();
|
|
state double start = intervalStart;
|
|
|
|
if (reload) {
|
|
while (kvBytesTotal < kvBytesTarget) {
|
|
wait(yield());
|
|
|
|
Version lastVer = btree->getLatestVersion();
|
|
state Version version = lastVer + 1;
|
|
btree->setWriteVersion(version);
|
|
state int changesThisVersion =
|
|
deterministicRandom()->randomInt(0, maxRecordsPerCommit - recordsThisCommit + 1);
|
|
|
|
while (changesThisVersion > 0 && kvBytesThisCommit < maxKVBytesPerCommit) {
|
|
KeyValue kv;
|
|
kv.key = randomString(kv.arena(),
|
|
deterministicRandom()->randomInt(minKeyPrefixBytes + sizeof(uint32_t),
|
|
maxKeyPrefixBytes + sizeof(uint32_t) + 1),
|
|
firstKeyChar, lastKeyChar);
|
|
int32_t index = deterministicRandom()->randomInt(0, nodeCount);
|
|
int runLength = deterministicRandom()->randomInt(minConsecutiveRun, maxConsecutiveRun + 1);
|
|
|
|
while (runLength > 0 && changesThisVersion > 0) {
|
|
*(uint32_t*)(kv.key.end() - sizeof(uint32_t)) = bigEndian32(index++);
|
|
kv.value = StringRef((uint8_t*)value.data(),
|
|
deterministicRandom()->randomInt(minValueSize, maxValueSize + 1));
|
|
|
|
btree->set(kv);
|
|
|
|
--runLength;
|
|
--changesThisVersion;
|
|
kvBytesThisCommit += kv.key.size() + kv.value.size();
|
|
++recordsThisCommit;
|
|
}
|
|
|
|
wait(yield());
|
|
}
|
|
|
|
if (kvBytesThisCommit >= maxKVBytesPerCommit || recordsThisCommit >= maxRecordsPerCommit) {
|
|
btree->setOldestVersion(btree->getLastCommittedVersion());
|
|
wait(commit);
|
|
printf("Cumulative %.2f MB keyValue bytes written at %.2f MB/s\n", kvBytesTotal / 1e6,
|
|
kvBytesTotal / (timer() - start) / 1e6);
|
|
|
|
// Avoid capturing via this to freeze counter values
|
|
int recs = recordsThisCommit;
|
|
int kvb = kvBytesThisCommit;
|
|
|
|
// Capturing invervalStart via this->intervalStart makes IDE's unhappy as they do not know about the
|
|
// actor state object
|
|
double* pIntervalStart = &intervalStart;
|
|
|
|
commit = map(btree->commit(), [=](Void result) {
|
|
printf("Committed:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
double elapsed = timer() - *pIntervalStart;
|
|
printf("Committed %d keyValueBytes in %d records in %f seconds, %.2f MB/s\n", kvb, recs, elapsed,
|
|
kvb / elapsed / 1e6);
|
|
*pIntervalStart = timer();
|
|
return Void();
|
|
});
|
|
|
|
kvBytesTotal += kvBytesThisCommit;
|
|
kvBytesThisCommit = 0;
|
|
recordsThisCommit = 0;
|
|
}
|
|
}
|
|
|
|
wait(commit);
|
|
printf("Cumulative %.2f MB keyValue bytes written at %.2f MB/s\n", kvBytesTotal / 1e6,
|
|
kvBytesTotal / (timer() - start) / 1e6);
|
|
}
|
|
|
|
int seeks = 1e6;
|
|
printf("Warming cache with seeks\n");
|
|
actors.add(randomSeeks(btree, seeks / 3, firstKeyChar, lastKeyChar));
|
|
actors.add(randomSeeks(btree, seeks / 3, firstKeyChar, lastKeyChar));
|
|
actors.add(randomSeeks(btree, seeks / 3, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
state int ops = 10000;
|
|
|
|
printf("Serial scans with adaptive readAhead...\n");
|
|
actors.add(randomScans(btree, ops, 50, -1, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
printf("Serial scans with readAhead 3 pages...\n");
|
|
actors.add(randomScans(btree, ops, 50, 12000, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
printf("Serial scans with readAhead 2 pages...\n");
|
|
actors.add(randomScans(btree, ops, 50, 8000, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
printf("Serial scans with readAhead 1 page...\n");
|
|
actors.add(randomScans(btree, ops, 50, 4000, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
printf("Serial scans...\n");
|
|
actors.add(randomScans(btree, ops, 50, 0, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
printf("Serial seeks...\n");
|
|
actors.add(randomSeeks(btree, ops, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
printf("Parallel seeks...\n");
|
|
actors.add(randomSeeks(btree, ops, firstKeyChar, lastKeyChar));
|
|
actors.add(randomSeeks(btree, ops, firstKeyChar, lastKeyChar));
|
|
actors.add(randomSeeks(btree, ops, firstKeyChar, lastKeyChar));
|
|
wait(actors.signalAndReset());
|
|
printf("Stats:\n%s\n", g_redwoodMetrics.toString(true).c_str());
|
|
|
|
Future<Void> closedFuture = btree->onClosed();
|
|
btree->close();
|
|
wait(closedFuture);
|
|
|
|
return Void();
|
|
}
|
|
|
|
struct PrefixSegment {
|
|
int length;
|
|
int cardinality;
|
|
|
|
std::string toString() const { return format("{%d bytes, %d choices}", length, cardinality); }
|
|
};
|
|
|
|
// Utility class for generating kv pairs under a prefix pattern
|
|
// It currently uses std::string in an abstraction breaking way.
|
|
struct KVSource {
|
|
KVSource() {}
|
|
|
|
typedef VectorRef<uint8_t> PrefixRef;
|
|
typedef Standalone<PrefixRef> Prefix;
|
|
|
|
std::vector<PrefixSegment> desc;
|
|
std::vector<std::vector<std::string>> segments;
|
|
std::vector<Prefix> prefixes;
|
|
std::vector<Prefix*> prefixesSorted;
|
|
std::string valueData;
|
|
int prefixLen;
|
|
int lastIndex;
|
|
|
|
KVSource(const std::vector<PrefixSegment>& desc, int numPrefixes = 0) : desc(desc) {
|
|
if (numPrefixes == 0) {
|
|
numPrefixes = 1;
|
|
for (auto& p : desc) {
|
|
numPrefixes *= p.cardinality;
|
|
}
|
|
}
|
|
|
|
prefixLen = 0;
|
|
for (auto& s : desc) {
|
|
prefixLen += s.length;
|
|
std::vector<std::string> parts;
|
|
while (parts.size() < s.cardinality) {
|
|
parts.push_back(deterministicRandom()->randomAlphaNumeric(s.length));
|
|
}
|
|
segments.push_back(std::move(parts));
|
|
}
|
|
|
|
while (prefixes.size() < numPrefixes) {
|
|
std::string p;
|
|
for (auto& s : segments) {
|
|
p.append(s[deterministicRandom()->randomInt(0, s.size())]);
|
|
}
|
|
prefixes.push_back(PrefixRef((uint8_t*)p.data(), p.size()));
|
|
}
|
|
|
|
for (auto& p : prefixes) {
|
|
prefixesSorted.push_back(&p);
|
|
}
|
|
std::sort(prefixesSorted.begin(), prefixesSorted.end(), [](const Prefix* a, const Prefix* b) {
|
|
return KeyRef((uint8_t*)a->begin(), a->size()) < KeyRef((uint8_t*)b->begin(), b->size());
|
|
});
|
|
|
|
valueData = deterministicRandom()->randomAlphaNumeric(100000);
|
|
lastIndex = 0;
|
|
}
|
|
|
|
// Expands the chosen prefix in the prefix list to hold suffix,
|
|
// fills suffix with random bytes, and returns a reference to the string
|
|
KeyRef getKeyRef(int suffixLen) { return makeKey(randomPrefix(), suffixLen); }
|
|
|
|
// Like getKeyRef but uses the same prefix as the last randomly chosen prefix
|
|
KeyRef getAnotherKeyRef(int suffixLen, bool sorted = false) {
|
|
Prefix& p = sorted ? *prefixesSorted[lastIndex] : prefixes[lastIndex];
|
|
return makeKey(p, suffixLen);
|
|
}
|
|
|
|
// Like getKeyRef but gets a KeyRangeRef for two keys covering the given number of sorted adjacent prefixes
|
|
KeyRangeRef getRangeRef(int prefixesCovered, int suffixLen) {
|
|
prefixesCovered = std::min<int>(prefixesCovered, prefixes.size());
|
|
int i = deterministicRandom()->randomInt(0, prefixesSorted.size() - prefixesCovered);
|
|
Prefix* begin = prefixesSorted[i];
|
|
Prefix* end = prefixesSorted[i + prefixesCovered];
|
|
return KeyRangeRef(makeKey(*begin, suffixLen), makeKey(*end, suffixLen));
|
|
}
|
|
|
|
KeyRef getValue(int len) { return KeyRef(valueData).substr(0, len); }
|
|
|
|
// Move lastIndex to the next position, wrapping around to 0
|
|
void nextPrefix() {
|
|
++lastIndex;
|
|
if (lastIndex == prefixes.size()) {
|
|
lastIndex = 0;
|
|
}
|
|
}
|
|
|
|
Prefix& randomPrefix() {
|
|
lastIndex = deterministicRandom()->randomInt(0, prefixes.size());
|
|
return prefixes[lastIndex];
|
|
}
|
|
|
|
static KeyRef makeKey(Prefix& p, int suffixLen) {
|
|
p.reserve(p.arena(), p.size() + suffixLen);
|
|
uint8_t* wptr = p.end();
|
|
for (int i = 0; i < suffixLen; ++i) {
|
|
*wptr++ = (uint8_t)deterministicRandom()->randomAlphaNumeric();
|
|
}
|
|
return KeyRef(p.begin(), p.size() + suffixLen);
|
|
}
|
|
|
|
int numPrefixes() const { return prefixes.size(); };
|
|
|
|
std::string toString() const {
|
|
return format("{prefixLen=%d prefixes=%d format=%s}", prefixLen, numPrefixes(), ::toString(desc).c_str());
|
|
}
|
|
};
|
|
|
|
std::string toString(const StorageBytes& sb) {
|
|
return format("{%.2f MB total, %.2f MB free, %.2f MB available, %.2f MB used}", sb.total / 1e6, sb.free / 1e6,
|
|
sb.available / 1e6, sb.used / 1e6);
|
|
}
|
|
|
|
ACTOR Future<StorageBytes> getStableStorageBytes(IKeyValueStore* kvs) {
|
|
state StorageBytes sb = kvs->getStorageBytes();
|
|
|
|
// Wait for StorageBytes used metric to stabilize
|
|
loop {
|
|
wait(kvs->commit());
|
|
StorageBytes sb2 = kvs->getStorageBytes();
|
|
bool stable = sb2.used == sb.used;
|
|
sb = sb2;
|
|
if (stable) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return sb;
|
|
}
|
|
|
|
ACTOR Future<Void> prefixClusteredInsert(IKeyValueStore* kvs, int suffixSize, int valueSize, KVSource source,
|
|
int recordCountTarget, bool usePrefixesInOrder) {
|
|
state int commitTarget = 5e6;
|
|
|
|
state int recordSize = source.prefixLen + suffixSize + valueSize;
|
|
state int64_t kvBytesTarget = (int64_t)recordCountTarget * recordSize;
|
|
state int recordsPerPrefix = recordCountTarget / source.numPrefixes();
|
|
|
|
printf("\nstoreType: %d\n", kvs->getType());
|
|
printf("commitTarget: %d\n", commitTarget);
|
|
printf("prefixSource: %s\n", source.toString().c_str());
|
|
printf("usePrefixesInOrder: %d\n", usePrefixesInOrder);
|
|
printf("suffixSize: %d\n", suffixSize);
|
|
printf("valueSize: %d\n", valueSize);
|
|
printf("recordSize: %d\n", recordSize);
|
|
printf("recordsPerPrefix: %d\n", recordsPerPrefix);
|
|
printf("recordCountTarget: %d\n", recordCountTarget);
|
|
printf("kvBytesTarget: %" PRId64 "\n", kvBytesTarget);
|
|
|
|
state int64_t kvBytes = 0;
|
|
state int64_t kvBytesTotal = 0;
|
|
state int records = 0;
|
|
state Future<Void> commit = Void();
|
|
state std::string value = deterministicRandom()->randomAlphaNumeric(1e6);
|
|
|
|
wait(kvs->init());
|
|
|
|
state double intervalStart = timer();
|
|
state double start = intervalStart;
|
|
|
|
state std::function<void()> stats = [&]() {
|
|
double elapsed = timer() - start;
|
|
printf("Cumulative stats: %.2f seconds %.2f MB keyValue bytes %d records %.2f MB/s %.2f rec/s\r", elapsed,
|
|
kvBytesTotal / 1e6, records, kvBytesTotal / elapsed / 1e6, records / elapsed);
|
|
fflush(stdout);
|
|
};
|
|
|
|
while (kvBytesTotal < kvBytesTarget) {
|
|
wait(yield());
|
|
|
|
state int i;
|
|
for (i = 0; i < recordsPerPrefix; ++i) {
|
|
KeyValueRef kv(source.getAnotherKeyRef(4, usePrefixesInOrder), source.getValue(valueSize));
|
|
kvs->set(kv);
|
|
kvBytes += kv.expectedSize();
|
|
++records;
|
|
|
|
if (kvBytes >= commitTarget) {
|
|
wait(commit);
|
|
stats();
|
|
commit = kvs->commit();
|
|
kvBytesTotal += kvBytes;
|
|
if (kvBytesTotal >= kvBytesTarget) {
|
|
break;
|
|
}
|
|
kvBytes = 0;
|
|
}
|
|
}
|
|
|
|
// Use every prefix, one at a time
|
|
source.nextPrefix();
|
|
}
|
|
|
|
wait(commit);
|
|
stats();
|
|
printf("\n");
|
|
|
|
intervalStart = timer();
|
|
StorageBytes sb = wait(getStableStorageBytes(kvs));
|
|
printf("storageBytes: %s (stable after %.2f seconds)\n", toString(sb).c_str(), timer() - intervalStart);
|
|
|
|
printf("Clearing all keys\n");
|
|
intervalStart = timer();
|
|
kvs->clear(KeyRangeRef(LiteralStringRef(""), LiteralStringRef("\xff")));
|
|
state StorageBytes sbClear = wait(getStableStorageBytes(kvs));
|
|
printf("Cleared all keys in %.2f seconds, final storageByte: %s\n", timer() - intervalStart,
|
|
toString(sbClear).c_str());
|
|
|
|
return Void();
|
|
}
|
|
|
|
ACTOR Future<Void> sequentialInsert(IKeyValueStore* kvs, int prefixLen, int valueSize, int recordCountTarget) {
|
|
state int commitTarget = 5e6;
|
|
|
|
state KVSource source({ { prefixLen, 1 } });
|
|
state int recordSize = source.prefixLen + sizeof(uint64_t) + valueSize;
|
|
state int64_t kvBytesTarget = (int64_t)recordCountTarget * recordSize;
|
|
|
|
printf("\nstoreType: %d\n", kvs->getType());
|
|
printf("commitTarget: %d\n", commitTarget);
|
|
printf("valueSize: %d\n", valueSize);
|
|
printf("recordSize: %d\n", recordSize);
|
|
printf("recordCountTarget: %d\n", recordCountTarget);
|
|
printf("kvBytesTarget: %" PRId64 "\n", kvBytesTarget);
|
|
|
|
state int64_t kvBytes = 0;
|
|
state int64_t kvBytesTotal = 0;
|
|
state int records = 0;
|
|
state Future<Void> commit = Void();
|
|
state std::string value = deterministicRandom()->randomAlphaNumeric(1e6);
|
|
|
|
wait(kvs->init());
|
|
|
|
state double intervalStart = timer();
|
|
state double start = intervalStart;
|
|
|
|
state std::function<void()> stats = [&]() {
|
|
double elapsed = timer() - start;
|
|
printf("Cumulative stats: %.2f seconds %.2f MB keyValue bytes %d records %.2f MB/s %.2f rec/s\r", elapsed,
|
|
kvBytesTotal / 1e6, records, kvBytesTotal / elapsed / 1e6, records / elapsed);
|
|
fflush(stdout);
|
|
};
|
|
|
|
state uint64_t c = 0;
|
|
state Key key = source.getKeyRef(sizeof(uint64_t));
|
|
|
|
while (kvBytesTotal < kvBytesTarget) {
|
|
wait(yield());
|
|
*(uint64_t*)(key.end() - sizeof(uint64_t)) = bigEndian64(c);
|
|
KeyValueRef kv(key, source.getValue(valueSize));
|
|
kvs->set(kv);
|
|
kvBytes += kv.expectedSize();
|
|
++records;
|
|
|
|
if (kvBytes >= commitTarget) {
|
|
wait(commit);
|
|
stats();
|
|
commit = kvs->commit();
|
|
kvBytesTotal += kvBytes;
|
|
if (kvBytesTotal >= kvBytesTarget) {
|
|
break;
|
|
}
|
|
kvBytes = 0;
|
|
}
|
|
++c;
|
|
}
|
|
|
|
wait(commit);
|
|
stats();
|
|
printf("\n");
|
|
|
|
return Void();
|
|
}
|
|
|
|
Future<Void> closeKVS(IKeyValueStore* kvs) {
|
|
Future<Void> closed = kvs->onClosed();
|
|
kvs->close();
|
|
return closed;
|
|
}
|
|
|
|
ACTOR Future<Void> doPrefixInsertComparison(int suffixSize, int valueSize, int recordCountTarget,
|
|
bool usePrefixesInOrder, KVSource source) {
|
|
|
|
deleteFile("test.redwood");
|
|
wait(delay(5));
|
|
state IKeyValueStore* redwood = openKVStore(KeyValueStoreType::SSD_REDWOOD_V1, "test.redwood", UID(), 0);
|
|
wait(prefixClusteredInsert(redwood, suffixSize, valueSize, source, recordCountTarget, usePrefixesInOrder));
|
|
wait(closeKVS(redwood));
|
|
printf("\n");
|
|
|
|
deleteFile("test.sqlite");
|
|
deleteFile("test.sqlite-wal");
|
|
wait(delay(5));
|
|
state IKeyValueStore* sqlite = openKVStore(KeyValueStoreType::SSD_BTREE_V2, "test.sqlite", UID(), 0);
|
|
wait(prefixClusteredInsert(sqlite, suffixSize, valueSize, source, recordCountTarget, usePrefixesInOrder));
|
|
wait(closeKVS(sqlite));
|
|
printf("\n");
|
|
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/performance/prefixSizeComparison") {
|
|
state int suffixSize = 12;
|
|
state int valueSize = 100;
|
|
state int recordCountTarget = 100e6;
|
|
state int usePrefixesInOrder = false;
|
|
|
|
wait(doPrefixInsertComparison(suffixSize, valueSize, recordCountTarget, usePrefixesInOrder,
|
|
KVSource({ { 10, 100000 } })));
|
|
wait(doPrefixInsertComparison(suffixSize, valueSize, recordCountTarget, usePrefixesInOrder,
|
|
KVSource({ { 16, 100000 } })));
|
|
wait(doPrefixInsertComparison(suffixSize, valueSize, recordCountTarget, usePrefixesInOrder,
|
|
KVSource({ { 32, 100000 } })));
|
|
wait(doPrefixInsertComparison(suffixSize, valueSize, recordCountTarget, usePrefixesInOrder,
|
|
KVSource({ { 4, 5 }, { 12, 1000 }, { 8, 5 }, { 8, 4 } })));
|
|
|
|
return Void();
|
|
}
|
|
|
|
TEST_CASE("!/redwood/performance/sequentialInsert") {
|
|
state int prefixLen = 30;
|
|
state int valueSize = 100;
|
|
state int recordCountTarget = 100e6;
|
|
|
|
deleteFile("test.redwood");
|
|
wait(delay(5));
|
|
state IKeyValueStore* redwood = openKVStore(KeyValueStoreType::SSD_REDWOOD_V1, "test.redwood", UID(), 0);
|
|
wait(sequentialInsert(redwood, prefixLen, valueSize, recordCountTarget));
|
|
wait(closeKVS(redwood));
|
|
printf("\n");
|
|
|
|
return Void();
|
|
}
|