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foundationdb/fdbserver/OldTLogServer.actor.cpp

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/*
* OldTLogServer.actor.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "flow/actorcompiler.h"
#include "flow/Hash3.h"
#include "flow/Stats.h"
#include "flow/UnitTest.h"
#include "fdbclient/NativeAPI.h"
#include "fdbclient/Notified.h"
#include "fdbclient/KeyRangeMap.h"
#include "fdbclient/SystemData.h"
#include "WorkerInterface.h"
#include "TLogInterface.h"
#include "Knobs.h"
#include "IKeyValueStore.h"
#include "flow/ActorCollection.h"
#include "fdbrpc/FailureMonitor.h"
#include "IDiskQueue.h"
#include "fdbrpc/sim_validation.h"
#include "ServerDBInfo.h"
#include "LogSystem.h"
#include "WaitFailure.h"
using std::pair;
using std::make_pair;
using std::min;
using std::max;
namespace oldTLog {
struct TLogQueueEntryRef {
Version version;
Version knownCommittedVersion;
StringRef messages;
VectorRef< TagMessagesRef > tags;
TLogQueueEntryRef() : version(0), knownCommittedVersion(0) {}
TLogQueueEntryRef(Arena &a, TLogQueueEntryRef const &from)
: version(from.version), knownCommittedVersion(from.knownCommittedVersion), messages(a, from.messages), tags(a, from.tags) {
}
template <class Ar>
void serialize(Ar& ar) {
if( ar.protocolVersion() >= 0x0FDB00A460010001) {
ar & version & messages & tags & knownCommittedVersion;
} else if(ar.isDeserializing) {
ar & version & messages & tags;
knownCommittedVersion = 0;
}
}
size_t expectedSize() const {
return messages.expectedSize() + tags.expectedSize();
}
};
typedef Standalone<TLogQueueEntryRef> TLogQueueEntry;
struct TLogQueue : public IClosable {
public:
TLogQueue( IDiskQueue* queue, UID dbgid ) : queue(queue), debugNextReadVersion(1), dbgid(dbgid) {}
// Each packet in the queue is
// uint32_t payloadSize
// uint8_t payload[payloadSize] (begins with uint64_t protocolVersion via IncludeVersion)
// uint8_t validFlag
// TLogQueue is a durable queue of TLogQueueEntry objects with an interface similar to IDiskQueue
// TLogQueue pushes (but not commits) are atomic - after commit fails to return, a prefix of entire calls to push are durable. This is
// implemented on top of the weaker guarantee of IDiskQueue::commit (that a prefix of bytes is durable) using validFlag and by
// padding any incomplete packet with zeros after recovery.
// Before calling push, pop, or commit, the user must call readNext() until it throws
// end_of_stream(). It may not be called again thereafter.
Future<TLogQueueEntry> readNext() {
return readNext( this );
}
void push( TLogQueueEntryRef const& qe ) {
ASSERT( version_location.empty() || version_location.lastItem()->key < qe.version );
BinaryWriter wr( Unversioned() ); // outer framing is not versioned
wr << uint32_t(0);
IncludeVersion().write(wr); // payload is versioned
wr << qe;
wr << uint8_t(1);
*(uint32_t*)wr.getData() = wr.getLength() - sizeof(uint32_t) - sizeof(uint8_t);
auto loc = queue->push( wr.toStringRef() );
//TraceEvent("TLogQueueVersionWritten", dbgid).detail("Size", wr.getLength() - sizeof(uint32_t) - sizeof(uint8_t)).detail("Loc", loc);
version_location[qe.version] = loc;
}
void pop( Version upTo ) {
// Keep only the given and all subsequent version numbers
// Find the first version >= upTo
auto v = version_location.lower_bound(upTo);
if (v == version_location.begin()) return;
if(v == version_location.end()) {
v = version_location.lastItem();
}
else {
v.decrementNonEnd();
}
queue->pop( v->value );
version_location.erase( version_location.begin(), v ); // ... and then we erase that previous version and all prior versions
}
Future<Void> commit() { return queue->commit(); }
// Implements IClosable
virtual Future<Void> getError() { return queue->getError(); }
virtual Future<Void> onClosed() { return queue->onClosed(); }
virtual void dispose() { queue->dispose(); delete this; }
virtual void close() { queue->close(); delete this; }
private:
IDiskQueue* queue;
Map<Version, IDiskQueue::location> version_location; // For the version of each entry that was push()ed, the end location of the serialized bytes
Version debugNextReadVersion;
UID dbgid;
ACTOR static Future<TLogQueueEntry> readNext( TLogQueue* self ) {
state TLogQueueEntry result;
state int zeroFillSize = 0;
loop {
Standalone<StringRef> h = wait( self->queue->readNext( sizeof(uint32_t) ) );
if (h.size() != sizeof(uint32_t)) {
if (h.size()) {
TEST( true ); // Zero fill within size field
int payloadSize = 0;
memcpy(&payloadSize, h.begin(), h.size());
zeroFillSize = sizeof(uint32_t)-h.size(); // zero fill the size itself
zeroFillSize += payloadSize+1; // and then the contents and valid flag
}
break;
}
state uint32_t payloadSize = *(uint32_t*)h.begin();
ASSERT( payloadSize < (100<<20) );
Standalone<StringRef> e = wait( self->queue->readNext( payloadSize+1 ) );
if (e.size() != payloadSize+1) {
TEST( true ); // Zero fill within payload
zeroFillSize = payloadSize+1 - e.size();
break;
}
if (e[payloadSize]) {
Arena a = e.arena();
ArenaReader ar( a, e.substr(0, payloadSize), IncludeVersion() );
ar >> result;
ASSERT( result.version >= self->debugNextReadVersion );
self->debugNextReadVersion = result.version + 1;
self->version_location[result.version] = self->queue->getNextReadLocation();
return result;
}
}
if (zeroFillSize) {
TEST( true ); // Fixing a partial commit at the end of the tlog queue
for(int i=0; i<zeroFillSize; i++)
self->queue->push( StringRef((const uint8_t*)"",1) );
}
throw end_of_stream();
}
};
struct LengthPrefixedStringRef {
// Represents a pointer to a string which is prefixed by a 4-byte length
// A LengthPrefixedStringRef is only pointer-sized (8 bytes vs 12 bytes for StringRef), but the corresponding string is 4 bytes bigger, and
// substring operations aren't efficient as they are with StringRef. It's a good choice when there might be lots of references to the same
// exact string.
uint32_t* length;
StringRef toStringRef() const { ASSERT(length); return StringRef( (uint8_t*)(length+1), *length ); }
int expectedSize() const { ASSERT(length); return *length; }
uint32_t* getLengthPtr() const { return length; }
LengthPrefixedStringRef() : length(NULL) {}
LengthPrefixedStringRef(uint32_t* length) : length(length) {}
};
template<class T>
struct CompareFirst {
bool operator() (T const& lhs, T const& rhs) const {
return lhs.first < rhs.first;
}
};
struct TLogData : NonCopyable {
struct TagData {
std::deque<std::pair<Version, LengthPrefixedStringRef>> version_messages;
bool nothing_persistent; // true means tag is *known* to have no messages in persistentData. false means nothing.
bool popped_recently; // `popped` has changed since last updatePersistentData
Version popped; // see popped version tracking contract below
bool update_version_sizes;
TagData( Version popped, bool nothing_persistent, bool popped_recently, Tag tag ) : nothing_persistent(nothing_persistent), popped(popped), popped_recently(popped_recently), update_version_sizes(tag != txsTag) {}
TagData(TagData&& r) noexcept(true) : version_messages(std::move(r.version_messages)), nothing_persistent(r.nothing_persistent), popped_recently(r.popped_recently), popped(r.popped), update_version_sizes(r.update_version_sizes) {}
void operator= (TagData&& r) noexcept(true) {
version_messages = std::move(r.version_messages);
nothing_persistent = r.nothing_persistent;
popped_recently = r.popped_recently;
popped = r.popped;
update_version_sizes = r.update_version_sizes;
}
// Erase messages not needed to update *from* versions >= before (thus, messages with toversion <= before)
ACTOR Future<Void> eraseMessagesBefore( TagData *self, Version before, Counter* bytesErased, TLogData *tlogData, int taskID ) {
while(!self->version_messages.empty() && self->version_messages.front().first < before) {
Version version = self->version_messages.front().first;
std::pair<int, int> &sizes = tlogData->version_sizes[version];
int64_t messagesErased = 0;
while(!self->version_messages.empty() && self->version_messages.front().first == version) {
auto const& m = self->version_messages.front();
++messagesErased;
if(self->update_version_sizes) {
sizes.first -= m.second.expectedSize();
}
self->version_messages.pop_front();
}
*bytesErased += (messagesErased * sizeof(std::pair<Version, LengthPrefixedStringRef>) * SERVER_KNOBS->VERSION_MESSAGES_OVERHEAD_FACTOR_1024THS) >> 10;
Void _ = wait(yield(taskID));
}
return Void();
}
Future<Void> eraseMessagesBefore(Version before, Counter* bytesErased, TLogData *tlogData, int taskID) {
return eraseMessagesBefore(this, before, bytesErased, tlogData, taskID);
}
};
/*
Popped version tracking contract needed by log system to implement ILogCursor::popped():
- Log server tracks for each (possible) tag a popped_version
Impl: TagData::popped (in memory) and persistTagPoppedKeys (in persistentData)
- popped_version(tag) is <= the maximum version for which log server (or a predecessor) is ever asked to pop the tag
Impl: Only increased by tLogPop() in response to either a pop request or recovery from a predecessor
- popped_version(tag) is > the maximum version for which log server is unable to peek messages due to previous pops (on this server or a predecessor)
Impl: Increased by tLogPop() atomically with erasing messages from memory; persisted by updatePersistentData() atomically with erasing messages from store; messages are not erased from queue where popped_version is not persisted
- LockTLogReply returns all tags which either have messages, or which have nonzero popped_versions
Impl: tag_data is present for all such tags
- peek(tag, v) returns the popped_version for tag if that is greater than v
Impl: Check tag_data->popped (after all waits)
*/
struct peekTrackerData {
std::map<int, Promise<Version>> sequence_version;
double lastUpdate;
};
std::map<UID, peekTrackerData> peekTracker;
UID dbgid;
bool coreStarted;
bool stopped;
DBRecoveryCount recoveryCount;
IKeyValueStore* persistentData;
IDiskQueue* rawPersistentQueue;
TLogQueue *persistentQueue;
VersionMetricHandle persistentDataVersion, persistentDataDurableVersion; // The last version number in the portion of the log (written|durable) to persistentData
NotifiedVersion version, queueCommittedVersion, queueCommitEnd;
Version queueCommitBegin, queueCommittingVersion;
int64_t diskQueueCommitBytes;
AsyncVar<bool> largeDiskQueueCommitBytes; //becomes true when diskQueueCommitBytes is greater than MAX_QUEUE_COMMIT_BYTES
Version prevVersion, knownCommittedVersion;
Deque<std::pair<Version, Standalone<VectorRef<uint8_t>>>> messageBlocks;
Map< Tag, TagData > tag_data;
Map<Version, std::pair<int,int>> version_sizes;
int64_t instanceID;
CounterCollection cc;
Counter bytesInput;
Counter bytesDurable;
Reference<AsyncVar<ServerDBInfo>> dbInfo;
Future<Void> updatePersist; //SOMEDAY: integrate the recovery and update storage so that only one of them is committing to persistant data.
PromiseStream<Future<Void>> addActor;
TLogData(UID dbgid, IKeyValueStore* persistentData, IDiskQueue * persistentQueue, Reference<AsyncVar<ServerDBInfo>> const& dbInfo)
: dbgid(dbgid),
persistentData(persistentData), rawPersistentQueue(persistentQueue), persistentQueue(new TLogQueue(persistentQueue, dbgid)),
prevVersion(0), knownCommittedVersion(0),
dbInfo(dbInfo),
updatePersist(Void()),
instanceID(g_random->randomUniqueID().first()),
cc("TLog", dbgid.toString()),
bytesInput("bytesInput", cc),
bytesDurable("bytesDurable", cc),
// These are initialized differently on init() or recovery
recoveryCount(), coreStarted(false), stopped(false), queueCommitBegin(0), queueCommitEnd(0), diskQueueCommitBytes(0), largeDiskQueueCommitBytes(false), queueCommittingVersion(0)
{
persistentDataVersion.init(LiteralStringRef("TLog.PersistentDataVersion"), cc.id);
persistentDataDurableVersion.init(LiteralStringRef("TLog.PersistentDataDurableVersion"), cc.id);
version.initMetric(LiteralStringRef("TLog.Version"), cc.id);
queueCommittedVersion.initMetric(LiteralStringRef("TLog.QueueCommittedVersion"), cc.id);
specialCounter(cc, "version", [this](){ return this->version.get(); });
specialCounter(cc, "kvstoreBytesUsed", [this](){ return this->persistentData->getStorageBytes().used; });
specialCounter(cc, "kvstoreBytesFree", [this](){ return this->persistentData->getStorageBytes().free; });
specialCounter(cc, "kvstoreBytesAvailable", [this](){ return this->persistentData->getStorageBytes().available; });
specialCounter(cc, "kvstoreBytesTotal", [this](){ return this->persistentData->getStorageBytes().total; });
specialCounter(cc, "queueDiskBytesUsed", [this](){ return this->rawPersistentQueue->getStorageBytes().used; });
specialCounter(cc, "queueDiskBytesFree", [this](){ return this->rawPersistentQueue->getStorageBytes().free; });
specialCounter(cc, "queueDiskBytesAvailable", [this](){ return this->rawPersistentQueue->getStorageBytes().available; });
specialCounter(cc, "queueDiskBytesTotal", [this](){ return this->rawPersistentQueue->getStorageBytes().total; });
}
LogEpoch epoch() const { return recoveryCount; }
};
ACTOR Future<Void> tLogLock( TLogData* self, ReplyPromise< TLogLockResult > reply ) {
state Version stopVersion = self->version.get();
TEST(true); // TLog stopped by recovering master
TEST( self->stopped );
TEST( !self->stopped );
TraceEvent("TLogStop", self->dbgid).detail("Ver", stopVersion).detail("isStopped", self->stopped);
self->stopped = true;
// Lock once the current version has been committed
Void _ = wait( self->queueCommittedVersion.whenAtLeast( stopVersion ) );
ASSERT(stopVersion == self->version.get());
TLogLockResult result;
result.end = stopVersion;
result.knownCommittedVersion = self->knownCommittedVersion;
for( auto & tag : self->tag_data )
result.tags.push_back( tag.key );
reply.send( result );
return Void();
}
////// Persistence format (for self->persistentData)
// Immutable keys
static const KeyValueRef persistFormat( LiteralStringRef( "Format" ), LiteralStringRef("FoundationDB/LogServer/2/2") );
static const KeyRangeRef persistFormatReadableRange( LiteralStringRef("FoundationDB/LogServer/2/2"), LiteralStringRef("FoundationDB/LogServer/2/3") );
static const KeyRef persistID = LiteralStringRef( "ID" );
static const KeyRef persistRecoveryCountKey = LiteralStringRef("DbRecoveryCount");
// Updated on updatePersistentData()
static const KeyRef persistCurrentVersionKey = LiteralStringRef("version");
static const KeyRange persistTagMessagesKeys = prefixRange(LiteralStringRef("TagMsg/"));
static const KeyRange persistTagPoppedKeys = prefixRange(LiteralStringRef("TagPop/"));
// Only present during network recovery process
static const KeyValueRef persistRecoveryInProgress( LiteralStringRef("RecoveryInProgress"), LiteralStringRef("1") );
static Key persistTagMessagesKey( Tag tag, Version version ) {
BinaryWriter wr( Unversioned() );
wr.serializeBytes(persistTagMessagesKeys.begin);
wr << tag;
wr << bigEndian64( version );
return wr.toStringRef();
}
static Key persistTagPoppedKey( Tag tag ) {
BinaryWriter wr(Unversioned());
wr.serializeBytes( persistTagPoppedKeys.begin );
wr << tag;
return wr.toStringRef();
}
static Value persistTagPoppedValue( Version popped ) {
return BinaryWriter::toValue( popped, Unversioned() );
}
static Tag decodeTagPoppedKey( KeyRef key ) {
Tag s;
BinaryReader rd( key.removePrefix(persistTagPoppedKeys.begin), Unversioned() );
rd >> s;
return s;
}
static Version decodeTagPoppedValue( ValueRef value ) {
return BinaryReader::fromStringRef<Version>( value, Unversioned() );
}
static StringRef stripTagMessagesKey( StringRef key ) {
return key.substr( sizeof(Tag) + persistTagMessagesKeys.begin.size() );
}
static Version decodeTagMessagesKey( StringRef key ) {
return bigEndian64( BinaryReader::fromStringRef<Version>( stripTagMessagesKey(key), Unversioned() ) );
}
static Standalone<StringRef> decodeTagMessagesKeyTag( StringRef key ) {
key = key.removePrefix( persistTagMessagesKeys.begin ); // <tag>\x00\xff<version>
BinaryWriter wr( Unversioned() );
for(auto c = key.begin(); c != key.end(); ++c) {
if (*c)
wr << *c;
else {
ASSERT( c+1 != key.end() );
if (c[1] == 0xff) {
wr << uint8_t(0);
c++;
} else if (c[1] == 0)
break;
else
throw internal_error();
}
}
return wr.toStringRef();
}
void validate( TLogData* self, bool force = false ) {
}
void updatePersistentPopped( TLogData* self, Tag tag, TLogData::TagData& data ) {
if (!data.popped_recently) return;
self->persistentData->set(KeyValueRef( persistTagPoppedKey(tag), persistTagPoppedValue(data.popped) ));
data.popped_recently = false;
if (data.nothing_persistent) return;
self->persistentData->clear( KeyRangeRef(
persistTagMessagesKey( tag, Version(0) ),
persistTagMessagesKey( tag, data.popped ) ) );
if (data.popped > self->persistentDataVersion)
data.nothing_persistent = true;
//TraceEvent("TLogPopWrite", self->dbgid).detail("Tag", tag).detail("To", data.popped);
}
ACTOR Future<Void> updatePersistentData( TLogData* self, Version newPersistentDataVersion ) {
// PERSIST: Changes self->persistentDataVersion and writes and commits the relevant changes
ASSERT( newPersistentDataVersion <= self->version.get() );
ASSERT( newPersistentDataVersion <= self->queueCommittedVersion.get() );
ASSERT( newPersistentDataVersion > self->persistentDataVersion );
ASSERT( self->persistentDataVersion == self->persistentDataDurableVersion );
//TraceEvent("updatePersistentData", self->dbgid).detail("seq", newPersistentDataSeq);
state bool anyData = false;
state Map<Tag, TLogData::TagData>::iterator tag;
// For all existing tags
for(tag = self->tag_data.begin(); tag != self->tag_data.end(); ++tag) {
state Version currentVersion = 0;
// Clear recently popped versions from persistentData if necessary
updatePersistentPopped( self, tag->key, tag->value );
// Transfer unpopped messages with version numbers less than newPersistentDataVersion to persistentData
state std::deque<std::pair<Version, LengthPrefixedStringRef>>::iterator msg = tag->value.version_messages.begin();
while(msg != tag->value.version_messages.end() && msg->first <= newPersistentDataVersion) {
currentVersion = msg->first;
anyData = true;
tag->value.nothing_persistent = false;
BinaryWriter wr( Unversioned() );
for(; msg != tag->value.version_messages.end() && msg->first == currentVersion; ++msg)
wr << msg->second.toStringRef();
self->persistentData->set( KeyValueRef( persistTagMessagesKey( tag->key, currentVersion ), wr.toStringRef() ) );
Future<Void> f = yield(TaskUpdateStorage);
if(!f.isReady()) {
Void _ = wait(f);
msg = std::upper_bound(tag->value.version_messages.begin(), tag->value.version_messages.end(), std::make_pair(currentVersion, LengthPrefixedStringRef()), CompareFirst<std::pair<Version, LengthPrefixedStringRef>>());
}
}
Void _ = wait(yield(TaskUpdateStorage));
}
self->persistentData->set( KeyValueRef( persistCurrentVersionKey, BinaryWriter::toValue(newPersistentDataVersion, Unversioned()) ) );
self->persistentDataVersion = newPersistentDataVersion;
Void _ = wait( self->persistentData->commit() ); // SOMEDAY: This seems to be running pretty often, should we slow it down???
Void _ = wait( delay(0, TaskUpdateStorage) );
// Now that the changes we made to persistentData are durable, erase the data we moved from memory and the queue, increase bytesDurable accordingly, and update persistentDataDurableVersion.
TEST(anyData); // TLog moved data to persistentData
self->persistentDataDurableVersion = newPersistentDataVersion;
for(tag = self->tag_data.begin(); tag != self->tag_data.end(); ++tag) {
Void _ = wait(tag->value.eraseMessagesBefore( newPersistentDataVersion+1, &self->bytesDurable, self, TaskUpdateStorage ));
Void _ = wait(yield(TaskUpdateStorage));
}
self->version_sizes.erase(self->version_sizes.begin(), self->version_sizes.lower_bound(self->persistentDataDurableVersion));
Void _ = wait(yield(TaskUpdateStorage));
while(!self->messageBlocks.empty() && self->messageBlocks.front().first <= newPersistentDataVersion) {
self->bytesDurable += self->messageBlocks.front().second.size() * SERVER_KNOBS->TLOG_MESSAGE_BLOCK_OVERHEAD_FACTOR;
self->messageBlocks.pop_front();
Void _ = wait(yield(TaskUpdateStorage));
}
ASSERT(self->bytesDurable.getValue() <= self->bytesInput.getValue());
if( self->queueCommitEnd.get() > 0 )
self->persistentQueue->pop( newPersistentDataVersion+1 ); // SOMEDAY: this can cause a slow task (~0.5ms), presumably from erasing too many versions. Should we limit the number of versions cleared at a time?
return Void();
}
// This function (and updatePersistentData, which is called by this function) run at a low priority and can soak up all CPU resources.
// For this reason, they employ aggressive use of yields to avoid causing slow tasks that could introduce latencies for more important
// work (e.g. commits).
ACTOR Future<Void> updateStorage( TLogData* self ) {
Void _ = wait(delay(0, TaskUpdateStorage));
loop {
state Version prevVersion = 0;
state Version nextVersion = 0;
state int totalSize = 0;
state Map<Version, std::pair<int, int>>::iterator sizeItr = self->version_sizes.begin();
while( totalSize < SERVER_KNOBS->UPDATE_STORAGE_BYTE_LIMIT && sizeItr != self->version_sizes.end()
&& (self->bytesInput.getValue() - self->bytesDurable.getValue() - totalSize >= SERVER_KNOBS->TLOG_SPILL_THRESHOLD || sizeItr->value.first == 0) )
{
Void _ = wait( yield(TaskUpdateStorage) );
++sizeItr;
nextVersion = sizeItr == self->version_sizes.end() ? self->version.get() : sizeItr->key;
state Map<Tag, TLogData::TagData>::iterator tag;
for(tag = self->tag_data.begin(); tag != self->tag_data.end(); ++tag) {
auto it = std::lower_bound(tag->value.version_messages.begin(), tag->value.version_messages.end(), std::make_pair(prevVersion, LengthPrefixedStringRef()), CompareFirst<std::pair<Version, LengthPrefixedStringRef>>());
for(; it != tag->value.version_messages.end() && it->first < nextVersion; ++it) {
totalSize += it->second.expectedSize();
}
Void _ = wait(yield(TaskUpdateStorage));
}
prevVersion = nextVersion;
}
nextVersion = std::max<Version>(nextVersion, self->persistentDataVersion);
//TraceEvent("UpdateStorageVer", self->dbgid).detail("nextVersion", nextVersion).detail("persistentDataVersion", self->persistentDataVersion).detail("totalSize", totalSize);
Void _ = wait( self->queueCommittedVersion.whenAtLeast( nextVersion ) );
Void _ = wait( delay(0, TaskUpdateStorage) );
if (nextVersion > self->persistentDataVersion) {
self->updatePersist = updatePersistentData(self, nextVersion);
Void _ = wait( self->updatePersist );
}
if( totalSize < SERVER_KNOBS->UPDATE_STORAGE_BYTE_LIMIT ) {
Void _ = wait( delay(BUGGIFY ? SERVER_KNOBS->BUGGIFY_TLOG_STORAGE_MIN_UPDATE_INTERVAL : SERVER_KNOBS->TLOG_STORAGE_MIN_UPDATE_INTERVAL, TaskUpdateStorage) );
}
else {
//recovery wants to commit to persistant data when updatePersistentData is not active, this delay ensures that immediately after
//updatePersist returns another one has not been started yet.
Void _ = wait( delay(0.0, TaskUpdateStorage) );
}
}
}
void commitMessages( TLogData* self, Version version, Arena arena, StringRef messages, VectorRef< TagMessagesRef > tags) {
// SOMEDAY: This method of copying messages is reasonably memory efficient, but it's still a lot of bytes copied. Find a
// way to do the memory allocation right as we receive the messages in the network layer.
int64_t addedBytes = 0;
int64_t expectedBytes = 0;
if(!messages.size()) {
return;
}
StringRef messages1; // the first block of messages, if they aren't all stored contiguously. otherwise empty
// Grab the last block in the blocks list so we can share its arena
// We pop all of the elements of it to create a "fresh" vector that starts at the end of the previous vector
Standalone<VectorRef<uint8_t>> block;
if(self->messageBlocks.empty()) {
block = Standalone<VectorRef<uint8_t>>();
block.reserve(block.arena(), std::max<int64_t>(SERVER_KNOBS->TLOG_MESSAGE_BLOCK_BYTES, messages.size()));
}
else {
block = self->messageBlocks.back().second;
}
block.pop_front(block.size());
// If the current batch of messages doesn't fit entirely in the remainder of the last block in the list
if(messages.size() + block.size() > block.capacity()) {
// Find how many messages will fit
LengthPrefixedStringRef r((uint32_t*)messages.begin());
uint8_t const* end = messages.begin() + block.capacity() - block.size();
while(r.toStringRef().end() <= end) {
r = LengthPrefixedStringRef( (uint32_t*)r.toStringRef().end() );
}
// Fill up the rest of this block
int bytes = (uint8_t*)r.getLengthPtr()-messages.begin();
if (bytes) {
TEST(true); // Splitting commit messages across multiple blocks
messages1 = StringRef(block.end(), bytes);
block.append(block.arena(), messages.begin(), bytes);
self->messageBlocks.push_back( std::make_pair(version, block) );
addedBytes += int64_t(block.size()) * SERVER_KNOBS->TLOG_MESSAGE_BLOCK_OVERHEAD_FACTOR;
messages = messages.substr(bytes);
}
// Make a new block
block = Standalone<VectorRef<uint8_t>>();
block.reserve(block.arena(), std::max<int64_t>(SERVER_KNOBS->TLOG_MESSAGE_BLOCK_BYTES, messages.size()));
}
// Copy messages into block
ASSERT(messages.size() <= block.capacity() - block.size());
block.append(block.arena(), messages.begin(), messages.size());
self->messageBlocks.push_back( std::make_pair(version, block) );
addedBytes += int64_t(block.size()) * SERVER_KNOBS->TLOG_MESSAGE_BLOCK_OVERHEAD_FACTOR;
messages = StringRef(block.end()-messages.size(), messages.size());
for(auto tag = tags.begin(); tag != tags.end(); ++tag) {
int64_t tagMessages = 0;
auto tsm = self->tag_data.find(tag->tag);
if (tsm == self->tag_data.end()) {
tsm = self->tag_data.insert( mapPair(std::move(Tag(tag->tag)), TLogData::TagData(Version(0), true, true, tag->tag) ), false );
}
if (version >= tsm->value.popped) {
for(int m = 0; m < tag->messageOffsets.size(); ++m) {
int offs = tag->messageOffsets[m];
uint8_t const* p = offs < messages1.size() ? messages1.begin() + offs : messages.begin() + offs - messages1.size();
tsm->value.version_messages.push_back(std::make_pair(version, LengthPrefixedStringRef((uint32_t*)p)));
if(tsm->value.version_messages.back().second.expectedSize() > SERVER_KNOBS->MAX_MESSAGE_SIZE) {
TraceEvent(SevWarnAlways, "LargeMessage").detail("Size", tsm->value.version_messages.back().second.expectedSize());
}
if (tag->tag != txsTag)
expectedBytes += tsm->value.version_messages.back().second.expectedSize();
++tagMessages;
}
}
// The factor of VERSION_MESSAGES_OVERHEAD is intended to be an overestimate of the actual memory used to store this data in a std::deque.
// In practice, this number is probably something like 528/512 ~= 1.03, but this could vary based on the implementation.
// There will also be a fixed overhead per std::deque, but its size should be trivial relative to the size of the TLog
// queue and can be thought of as increasing the capacity of the queue slightly.
addedBytes += (tagMessages * sizeof(std::pair<Version, LengthPrefixedStringRef>) * SERVER_KNOBS->VERSION_MESSAGES_OVERHEAD_FACTOR_1024THS) >> 10;
}
self->version_sizes[version] = make_pair(expectedBytes, expectedBytes);
self->bytesInput += addedBytes;
//TraceEvent("TLogPushed", self->dbgid).detail("Bytes", addedBytes).detail("MessageBytes", messages.size()).detail("Tags", tags.size()).detail("expectedBytes", expectedBytes).detail("mCount", mCount).detail("tCount", tCount);
}
Version poppedVersion( TLogData* self, Tag tag) {
auto mapIt = self->tag_data.find(tag);
if (mapIt == self->tag_data.end())
return Version(0);
return mapIt->value.popped;
}
std::deque<std::pair<Version, LengthPrefixedStringRef>> & get_version_messages( TLogData* self, Tag tag ) {
auto mapIt = self->tag_data.find(tag);
if (mapIt == self->tag_data.end()) {
static std::deque<std::pair<Version, LengthPrefixedStringRef>> empty;
return empty;
}
return mapIt->value.version_messages;
};
ACTOR Future<Void> tLogPop( TLogData* self, TLogPopRequest req ) {
auto ti = self->tag_data.find(req.tag);
if (ti == self->tag_data.end()) {
ti = self->tag_data.insert( mapPair(std::move(Tag(req.tag)), TLogData::TagData(req.to, true, true, req.tag)) );
} else if (req.to > ti->value.popped) {
ti->value.popped = req.to;
ti->value.popped_recently = true;
//if (to.epoch == self->epoch())
if ( req.to > self->persistentDataDurableVersion )
Void _ = wait(ti->value.eraseMessagesBefore( req.to, &self->bytesDurable, self, TaskTLogPop ));
//TraceEvent("TLogPop", self->dbgid).detail("Tag", req.tag).detail("To", req.to);
}
req.reply.send(Void());
return Void();
}
void peekMessagesFromMemory( TLogData* self, TLogPeekRequest const& req, BinaryWriter& messages, Version& endVersion ) {
ASSERT( !messages.getLength() );
auto& deque = get_version_messages(self, req.tag);
//TraceEvent("tLogPeekMem", self->dbgid).detail("Tag", printable(req.tag1)).detail("pDS", self->persistentDataSequence).detail("pDDS", self->persistentDataDurableSequence).detail("Oldest", map1.empty() ? 0 : map1.begin()->key ).detail("OldestMsgCount", map1.empty() ? 0 : map1.begin()->value.size());
Version begin = std::max( req.begin, self->persistentDataDurableVersion+1 );
auto it = std::lower_bound(deque.begin(), deque.end(), std::make_pair(begin, LengthPrefixedStringRef()), CompareFirst<std::pair<Version, LengthPrefixedStringRef>>());
Version currentVersion = -1;
for(; it != deque.end(); ++it) {
if(it->first != currentVersion) {
if (messages.getLength() >= SERVER_KNOBS->DESIRED_TOTAL_BYTES) {
endVersion = it->first;
//TraceEvent("tLogPeekMessagesReached2", self->dbgid);
break;
}
currentVersion = it->first;
messages << int32_t(-1) << currentVersion;
}
messages << it->second.toStringRef();
}
}
ACTOR Future<Void> tLogPeekMessages( TLogData* self, TLogPeekRequest req ) {
state BinaryWriter messages(Unversioned());
state BinaryWriter messages2(Unversioned());
state int sequence = -1;
state UID peekId;
if(req.sequence.present()) {
try {
peekId = req.sequence.get().first;
sequence = req.sequence.get().second;
if(sequence > 0) {
auto& trackerData = self->peekTracker[peekId];
trackerData.lastUpdate = now();
Version ver = wait(trackerData.sequence_version[sequence].getFuture());
req.begin = ver;
Void _ = wait(yield());
}
} catch( Error &e ) {
if(e.code() == error_code_timed_out) {
req.reply.sendError(timed_out());
return Void();
} else {
throw;
}
}
}
if( req.returnIfBlocked && self->version.get() < req.begin ) {
req.reply.sendError(end_of_stream());
return Void();
}
//TraceEvent("tLogPeekMessages0", self->dbgid).detail("reqBeginEpoch", req.begin.epoch).detail("reqBeginSeq", req.begin.sequence).detail("epoch", self->epoch()).detail("persistentDataSeq", self->persistentDataSequence).detail("Tag1", printable(req.tag1)).detail("Tag2", printable(req.tag2));
// Wait until we have something to return that the caller doesn't already have
if( self->version.get() < req.begin ) {
Void _ = wait( self->version.whenAtLeast( req.begin ) );
Void _ = wait( delay(SERVER_KNOBS->TLOG_PEEK_DELAY, g_network->getCurrentTask()) );
}
state Version endVersion = self->version.get() + 1;
//grab messages from disk
//TraceEvent("tLogPeekMessages", self->dbgid).detail("reqBeginEpoch", req.begin.epoch).detail("reqBeginSeq", req.begin.sequence).detail("epoch", self->epoch()).detail("persistentDataSeq", self->persistentDataSequence).detail("Tag1", printable(req.tag1)).detail("Tag2", printable(req.tag2));
if( req.begin <= self->persistentDataDurableVersion ) {
// Just in case the durable version changes while we are waiting for the read, we grab this data from memory. We may or may not actually send it depending on
// whether we get enough data from disk.
// SOMEDAY: Only do this if an initial attempt to read from disk results in insufficient data and the required data is no longer in memory
// SOMEDAY: Should we only send part of the messages we collected, to actually limit the size of the result?
peekMessagesFromMemory( self, req, messages2, endVersion );
Standalone<VectorRef<KeyValueRef>> kvs = wait(
self->persistentData->readRange(KeyRangeRef(
persistTagMessagesKey(req.tag, req.begin),
persistTagMessagesKey(req.tag, self->persistentDataDurableVersion + 1)), SERVER_KNOBS->DESIRED_TOTAL_BYTES, SERVER_KNOBS->DESIRED_TOTAL_BYTES));
//TraceEvent("TLogPeekResults", self->dbgid).detail("ForAddress", req.reply.getEndpoint().address).detail("Tag1Results", s1).detail("Tag2Results", s2).detail("Tag1ResultsLim", kv1.size()).detail("Tag2ResultsLim", kv2.size()).detail("Tag1ResultsLast", kv1.size() ? printable(kv1[0].key) : "").detail("Tag2ResultsLast", kv2.size() ? printable(kv2[0].key) : "").detail("Limited", limited).detail("NextEpoch", next_pos.epoch).detail("NextSeq", next_pos.sequence).detail("NowEpoch", self->epoch()).detail("NowSeq", self->sequence.getNextSequence());
for (auto &kv : kvs) {
auto ver = decodeTagMessagesKey(kv.key);
messages << int32_t(-1) << ver;
messages.serializeBytes(kv.value);
}
if (kvs.expectedSize() >= SERVER_KNOBS->DESIRED_TOTAL_BYTES)
endVersion = decodeTagMessagesKey(kvs.end()[-1].key) + 1;
else
messages.serializeBytes( messages2.toStringRef() );
} else {
peekMessagesFromMemory( self, req, messages, endVersion );
//TraceEvent("TLogPeekResults", self->dbgid).detail("ForAddress", req.reply.getEndpoint().address).detail("MessageBytes", messages.getLength()).detail("NextEpoch", next_pos.epoch).detail("NextSeq", next_pos.sequence).detail("NowSeq", self->sequence.getNextSequence());
}
Version poppedVer = poppedVersion(self, req.tag);
TLogPeekReply reply;
reply.maxKnownVersion = self->version.get();
if(poppedVer > req.begin) {
reply.popped = poppedVer;
reply.end = poppedVer;
} else {
reply.messages = messages.toStringRef();
reply.end = endVersion;
}
//TraceEvent("TlogPeek", self->dbgid).detail("endVer", reply.end).detail("msgBytes", reply.messages.expectedSize()).detail("ForAddress", req.reply.getEndpoint().address);
if(req.sequence.present()) {
auto& trackerData = self->peekTracker[peekId];
trackerData.lastUpdate = now();
auto& sequenceData = trackerData.sequence_version[sequence+1];
if(sequenceData.isSet()) {
if(sequenceData.getFuture().get() != reply.end) {
TEST(true); //tlog peek second attempt ended at a different version
req.reply.sendError(timed_out());
return Void();
}
} else {
sequenceData.send(reply.end);
}
}
req.reply.send( reply );
return Void();
}
ACTOR Future<Void> doQueueCommit( TLogData* self ) {
state Version ver = self->version.get();
state Version commitNumber = self->queueCommitBegin+1;
self->queueCommitBegin = commitNumber;
self->queueCommittingVersion = ver;
Future<Void> c = self->persistentQueue->commit();
self->diskQueueCommitBytes = 0;
self->largeDiskQueueCommitBytes.set(false);
Void _ = wait(c);
Void _ = wait(self->queueCommitEnd.whenAtLeast(commitNumber-1));
//Calling check_yield instead of yield to avoid a destruction ordering problem in simulation
if(g_network->check_yield(g_network->getCurrentTask())) {
Void _ = wait(delay(0, g_network->getCurrentTask()));
}
ASSERT( ver > self->queueCommittedVersion.get() );
self->queueCommittedVersion.set(ver);
self->queueCommitEnd.set(commitNumber);
TraceEvent("TLogCommitDurable", self->dbgid).detail("Version", ver);
return Void();
}
ACTOR Future<Void> commitQueue( TLogData* self ) {
loop {
Void _ = wait( self->version.whenAtLeast( std::max(self->queueCommittingVersion, self->queueCommittedVersion.get()) + 1 ) );
while( self->queueCommitBegin != self->queueCommitEnd.get() && !self->largeDiskQueueCommitBytes.get() ) {
Void _ = wait( self->queueCommitEnd.whenAtLeast(self->queueCommitBegin) || self->largeDiskQueueCommitBytes.onChange() );
}
self->addActor.send(doQueueCommit(self));
}
}
ACTOR Future<Void> tLogCommit(
TLogData* self,
TLogCommitRequest req,
PromiseStream<Void> warningCollectorInput ) {
state Optional<UID> tlogDebugID;
if(req.debugID.present())
{
tlogDebugID = g_nondeterministic_random->randomUniqueID();
g_traceBatch.addAttach("CommitAttachID", req.debugID.get().first(), tlogDebugID.get().first());
g_traceBatch.addEvent("CommitDebug", tlogDebugID.get().first(), "TLog.tLogCommit.BeforeWaitForVersion");
}
self->knownCommittedVersion = std::max(self->knownCommittedVersion, req.knownCommittedVersion);
Void _ = wait( self->version.whenAtLeast( req.prevVersion ) );
//Calling check_yield instead of yield to avoid a destruction ordering problem in simulation
if(g_network->check_yield(g_network->getCurrentTask())) {
Void _ = wait(delay(0, g_network->getCurrentTask()));
}
if(self->stopped) {
req.reply.sendError( tlog_stopped() );
return Void();
}
if (self->version.get() == req.prevVersion) { // Not a duplicate (check relies on no waiting between here and self->version.set() below!)
if(req.debugID.present())
g_traceBatch.addEvent("CommitDebug", tlogDebugID.get().first(), "TLog.tLogCommit.Before");
TraceEvent("TLogCommit", self->dbgid).detail("Version", req.version);
commitMessages(self, req.version, req.arena, req.messages, req.tags);
// Log the changes to the persistent queue, to be committed by commitQueue()
TLogQueueEntryRef qe;
qe.version = req.version;
qe.knownCommittedVersion = req.knownCommittedVersion;
qe.messages = req.messages;
qe.tags = req.tags;
self->persistentQueue->push( qe );
self->diskQueueCommitBytes += qe.expectedSize();
if( self->diskQueueCommitBytes > SERVER_KNOBS->MAX_QUEUE_COMMIT_BYTES ) {
self->largeDiskQueueCommitBytes.set(true);
}
// Notifies the commitQueue actor to commit persistentQueue, and also unblocks tLogPeekMessages actors
self->prevVersion = self->version.get();
self->version.set( req.version );
if(req.debugID.present())
g_traceBatch.addEvent("CommitDebug", tlogDebugID.get().first(), "TLog.tLogCommit.AfterTLogCommit");
}
// Send replies only once all prior messages have been received and committed.
Void _ = wait( timeoutWarning( self->queueCommittedVersion.whenAtLeast( req.version ), 0.1, warningCollectorInput ) );
if(req.debugID.present())
g_traceBatch.addEvent("CommitDebug", tlogDebugID.get().first(), "TLog.tLogCommit.After");
req.reply.send( Void() );
return Void();
}
ACTOR Future<Void> initPersistentState( TLogData* self ) {
// PERSIST: Initial setup of persistentData for a brand new tLog for a new database
IKeyValueStore *storage = self->persistentData;
storage->set( persistFormat );
storage->set( KeyValueRef( persistID, BinaryWriter::toValue( self->dbgid, Unversioned() ) ) );
storage->set( KeyValueRef( persistCurrentVersionKey, BinaryWriter::toValue(self->version.get(), Unversioned()) ) );
storage->set( KeyValueRef( persistRecoveryCountKey, BinaryWriter::toValue(self->recoveryCount, Unversioned()) ) );
TraceEvent("TLogInitCommit", self->dbgid).detail("Version", self->version.get());
Void _ = wait( storage->commit() );
return Void();
}
ACTOR Future<Void> restorePersistentState( TLogData* self, Promise<DBRecoveryCount> outRecoveryCount, bool processQueue, TLogInterface myInterface ) {
state double startt = now();
// PERSIST: Read basic state from persistentData; replay persistentQueue but don't erase it
IKeyValueStore *storage = self->persistentData;
TraceEvent("TLogRestorePersistentState", self->dbgid).detail("pq", processQueue);
state Future<Optional<Value>> fFormat = storage->readValue(persistFormat.key);
state Future<Optional<Value>> fID = storage->readValue(persistID);
state Future<Optional<Value>> fVer = storage->readValue(persistCurrentVersionKey);
state Future<Optional<Value>> fRecoveryCount = storage->readValue(persistRecoveryCountKey);
state Future<Optional<Value>> fRecoveryInProgress = storage->readValue( persistRecoveryInProgress.key );
// FIXME: metadata in queue?
Void _ = wait( waitForAll( (vector<Future<Optional<Value>>>(), fFormat, fID, fVer, fRecoveryCount, fRecoveryInProgress) ) );
if (fFormat.get().present() && !persistFormatReadableRange.contains( fFormat.get().get() )) {
TraceEvent(SevError, "UnsupportedDBFormat", self->dbgid).detail("Format", printable(fFormat.get().get())).detail("Expected", persistFormat.value.toString());
throw worker_recovery_failed();
}
if (fRecoveryInProgress.get().present()) {
TEST(true); // We must have rebooted during network recovery; the master recovery that depended on us will fail and we can permanently delete our (incomplete) storage
TraceEvent("RestartedDuringNetworkRecovery", self->dbgid);
throw worker_removed();
}
if (!fFormat.get().present()) {
Standalone<VectorRef<KeyValueRef>> v = wait( self->persistentData->readRange( KeyRangeRef(StringRef(), LiteralStringRef("\xff")), 1 ) );
if (!v.size()) {
TEST(true); // The DB is completely empty, so it was never initialized. Delete it.
throw worker_removed();
} else {
// This should never happen
TraceEvent(SevError, "NoDBFormatKey", self->dbgid).detail("FirstKey", printable(v[0].key));
ASSERT( false );
throw worker_recovery_failed();
}
}
ASSERT( self->dbgid == BinaryReader::fromStringRef<UID>(fID.get().get(), Unversioned()) );
Version ver = BinaryReader::fromStringRef<Version>( fVer.get().get(), Unversioned() );
self->persistentDataVersion = ver;
self->persistentDataDurableVersion = ver;
self->version.set( ver );
TraceEvent("TLogRestorePersistentStateVer", self->dbgid).detail("ver", self->version.get());
self->recoveryCount = BinaryReader::fromStringRef<uint64_t>( fRecoveryCount.get().get(), Unversioned() );
outRecoveryCount.send( self->recoveryCount ); // This might cancel this actor (if the recovery count is ancient) and destroy self
Void _ = wait(Future<Void>(Void())); // ... so check for cancellation
// Restore popped keys. Pop operations that took place after the last (committed) updatePersistentDataVersion might be lost, but
// that is fine because we will get the corresponding data back, too.
state KeyRange tagKeys = persistTagPoppedKeys;
loop {
Standalone<VectorRef<KeyValueRef>> data = wait( self->persistentData->readRange( tagKeys, BUGGIFY ? 3 : 1<<30, 1<<20 ) );
if (!data.size()) break;
((KeyRangeRef&)tagKeys) = KeyRangeRef( keyAfter(data.back().key, tagKeys.arena()), tagKeys.end );
for(auto &kv : data) {
Tag tag = decodeTagPoppedKey(kv.key);
Version popped = decodeTagPoppedValue(kv.value);
TraceEvent("TLogRestorePop", self->dbgid).detail("Tag", tag).detail("To", popped);
ASSERT( self->tag_data.find(tag) == self->tag_data.end() );
self->tag_data.insert( mapPair( std::move(Tag(tag)), TLogData::TagData( popped, false, false, tag )) );
}
}
// PERSIST: Apply changes from queue
if (processQueue) {
state Version lastVer = 0;
state double recoverMemoryLimit = SERVER_KNOBS->TARGET_BYTES_PER_TLOG + SERVER_KNOBS->SPRING_BYTES_TLOG;
if (BUGGIFY) recoverMemoryLimit = SERVER_KNOBS->BUGGIFY_RECOVER_MEMORY_LIMIT;
try {
loop {
TLogQueueEntry qe = wait( self->persistentQueue->readNext() );
//TraceEvent("TLogRecoveredQE", self->dbgid).detail("ver", qe.version).detail("MessageBytes", qe.messages.size()).detail("Tags", qe.tags.size())
// .detail("Tag0", qe.tags.size() ? qe.tags[0].tag : invalidTag);
ASSERT( qe.version > lastVer );
lastVer = qe.version;
self->knownCommittedVersion = std::max(self->knownCommittedVersion, qe.knownCommittedVersion);
if( qe.version > self->version.get() ) {
commitMessages(self, qe.version, qe.arena(), qe.messages, qe.tags);
self->version.set( qe.version );
self->queueCommittedVersion.set( qe.version );
if (self->bytesInput.getValue() - self->bytesDurable.getValue() > recoverMemoryLimit) {
TEST(true); // Flush excess data during TLog queue recovery
TraceEvent("FlushLargeQueueDuringRecovery", self->dbgid).detail("BytesInput", self->bytesInput.getValue()).detail("BytesDurable", self->bytesDurable.getValue()).detail("Version", self->version.get()).detail("PVer", self->persistentDataVersion);
while(self->persistentDataDurableVersion != self->version.get()) {
Version nextVersion;
int totalSize = 0;
std::vector<std::pair<std::deque<std::pair<Version, LengthPrefixedStringRef>>::iterator, std::deque<std::pair<Version, LengthPrefixedStringRef>>::iterator>> iters;
for(auto tag = self->tag_data.begin(); tag != self->tag_data.end(); ++tag)
iters.push_back(std::make_pair(tag->value.version_messages.begin(), tag->value.version_messages.end()));
while( totalSize < SERVER_KNOBS->UPDATE_STORAGE_BYTE_LIMIT ) {
nextVersion = self->version.get();
for( auto &it : iters )
if(it.first != it.second)
nextVersion = std::min( nextVersion, it.first->first + 1 );
if(nextVersion == self->version.get())
break;
for( auto &it : iters ) {
while (it.first != it.second && it.first->first < nextVersion) {
totalSize += it.first->second.expectedSize();
++it.first;
}
}
}
Void _ = wait( updatePersistentData(self, nextVersion ) );
}
}
}
}
} catch (Error& e) {
if (e.code() != error_code_end_of_stream) throw;
}
}
TraceEvent("TLogRestorePersistentStateDone", self->dbgid)
.detail("pq", processQueue).detail("version", self->version.get()).detail("durableVer", self->persistentDataDurableVersion)
.detail("Took", now()-startt);
TEST( now()-startt >= 1.0 ); // TLog recovery took more than 1 second
TEST( processQueue ); // TLog recovered from disk queue
return Void();
}
void getQueuingMetrics( TLogData* self, TLogQueuingMetricsRequest const& req ) {
TLogQueuingMetricsReply reply;
reply.localTime = now();
reply.instanceID = self->instanceID;
reply.bytesInput = self->bytesInput.getValue();
reply.bytesDurable = self->bytesDurable.getValue();
reply.storageBytes = self->persistentData->getStorageBytes();
reply.v = self->prevVersion;
req.reply.send( reply );
}
ACTOR Future<Void> respondToRecovered( TLogInterface tli, Future<Void> recovery ) {
Void _ = wait( recovery );
loop {
TLogRecoveryFinishedRequest req = waitNext( tli.recoveryFinished.getFuture() );
req.reply.send(Void());
}
}
ACTOR Future<Void> cleanupPeekTrackers( TLogData* self ) {
loop {
double minExpireTime = SERVER_KNOBS->PEEK_TRACKER_EXPIRATION_TIME;
auto it = self->peekTracker.begin();
while(it != self->peekTracker.end()) {
double expireTime = SERVER_KNOBS->PEEK_TRACKER_EXPIRATION_TIME - now()-it->second.lastUpdate;
if(expireTime < 1.0e-6) {
for(auto seq : it->second.sequence_version) {
if(!seq.second.isSet()) {
seq.second.sendError(timed_out());
}
}
it = self->peekTracker.erase(it);
} else {
minExpireTime = std::min(minExpireTime, expireTime);
++it;
}
}
Void _ = wait( delay(minExpireTime) );
}
}
ACTOR Future<Void> serveTLogInterface( TLogData* self, TLogInterface tli, PromiseStream<Void> warningCollectorInput ) {
loop choose {
when( TLogPeekRequest req = waitNext( tli.peekMessages.getFuture() ) ) {
self->addActor.send( tLogPeekMessages( self, req ) );
}
when( TLogPopRequest req = waitNext( tli.popMessages.getFuture() ) ) {
self->addActor.send( tLogPop( self, req ) );
}
when( TLogCommitRequest req = waitNext( tli.commit.getFuture() ) ) {
TEST(self->stopped); // TLogCommitRequest while stopped
if (!self->stopped)
self->addActor.send( tLogCommit( self, req, warningCollectorInput ) );
else
req.reply.sendError( tlog_stopped() );
}
when( ReplyPromise< TLogLockResult > reply = waitNext( tli.lock.getFuture() ) ) {
self->addActor.send( tLogLock(self, reply) );
}
when (TLogQueuingMetricsRequest req = waitNext(tli.getQueuingMetrics.getFuture())) {
getQueuingMetrics(self, req);
}
when (TLogConfirmRunningRequest req = waitNext(tli.confirmRunning.getFuture())){
if (req.debugID.present() ) {
UID tlogDebugID = g_nondeterministic_random->randomUniqueID();
g_traceBatch.addAttach("TransactionAttachID", req.debugID.get().first(), tlogDebugID.first());
g_traceBatch.addEvent("TransactionDebug", tlogDebugID.first(), "TLogServer.TLogConfirmRunningRequest");
}
if (!self->stopped)
req.reply.send(Void());
else
req.reply.sendError( tlog_stopped() );
}
}
}
ACTOR Future<Void> tLogCore( TLogData* self, TLogInterface tli, Future<Void> recovery ) {
state PromiseStream<Void> warningCollectorInput;
state Future<Void> warningCollector = timeoutWarningCollector( warningCollectorInput.getFuture(), 1.0, "TLogQueueCommitSlow", self->dbgid );
state Future<Void> error = actorCollection( self->addActor.getFuture() );
self->addActor.send( updateStorage(self) );
self->addActor.send( commitQueue(self) );
self->addActor.send( waitFailureServer(tli.waitFailure.getFuture()) );
self->addActor.send( respondToRecovered(tli, recovery) );
self->addActor.send( traceCounters("TLogMetrics", self->dbgid, SERVER_KNOBS->STORAGE_LOGGING_DELAY, &self->cc, self->dbgid.toString() + "/TLogMetrics"));
self->addActor.send( cleanupPeekTrackers(self) );
if( recovery.isValid() && !recovery.isReady()) {
self->addActor.send( recovery );
}
self->coreStarted = true;
Void _ = wait( serveTLogInterface(self, tli, warningCollectorInput) || error );
throw internal_error();
};
ACTOR Future<Void> checkEmptyQueue(TLogData* self) {
TraceEvent("TLogCheckEmptyQueueBegin", self->dbgid);
try {
TLogQueueEntry r = wait( self->persistentQueue->readNext() );
throw internal_error();
} catch (Error& e) {
if (e.code() != error_code_end_of_stream) throw;
TraceEvent("TLogCheckEmptyQueueEnd", self->dbgid);
return Void();
}
}
ACTOR Future<Void> recoverTagFromLogSystem( TLogData* self, Version beginVersion, Version endVersion, Tag tag, Reference<AsyncVar<int>> uncommittedBytes, Reference<AsyncVar<Reference<ILogSystem>>> logSystem ) {
state Future<Void> dbInfoChange = Void();
state Reference<ILogSystem::IPeekCursor> r;
state Version tagAt = beginVersion;
state Version tagPopped = 0;
state Version lastVer = 0;
TraceEvent("LogRecoveringTagBegin", self->dbgid).detail("Tag", tag).detail("recoverAt", endVersion);
while (tagAt <= endVersion) {
loop {
choose {
when(Void _ = wait( r ? r->getMore() : Never() ) ) {
break;
}
when( Void _ = wait( dbInfoChange ) ) {
if(r) tagPopped = std::max(tagPopped, r->popped());
if( logSystem->get() )
r = logSystem->get()->peek( tagAt, tag );
else
r = Reference<ILogSystem::IPeekCursor>();
dbInfoChange = logSystem->onChange();
}
}
}
TraceEvent("LogRecoveringTagResults", self->dbgid).detail("Tag", tag);
Version ver = 0;
BinaryWriter wr( Unversioned() );
int writtenBytes = 0;
while (true) {
bool foundMessage = r->hasMessage();
//TraceEvent("LogRecoveringMsg").detail("Tag", tag).detail("foundMessage", foundMessage).detail("ver", r->version().toString());
if (!foundMessage || r->version().version != ver) {
ASSERT(r->version().version > lastVer);
if (ver) {
//TraceEvent("LogRecoveringTagVersion", self->dbgid).detail("Tag", tag).detail("Ver", ver).detail("Bytes", wr.getLength());
writtenBytes += 100 + wr.getLength();
self->persistentData->set( KeyValueRef( persistTagMessagesKey( tag, ver ), wr.toStringRef() ) );
}
lastVer = ver;
ver = r->version().version;
wr = BinaryWriter( Unversioned() );
if (!foundMessage || ver > endVersion)
break;
}
// FIXME: This logic duplicates stuff in LogPushData::addMessage(), and really would be better in PeekResults or somewhere else. Also unnecessary copying.
StringRef msg = r->getMessage();
wr << uint32_t( msg.size() + sizeof(uint32_t) ) << r->version().sub;
wr.serializeBytes( msg );
r->nextMessage();
}
tagAt = r->version().version;
if(writtenBytes)
uncommittedBytes->set(uncommittedBytes->get() + writtenBytes);
while(uncommittedBytes->get() >= SERVER_KNOBS->LARGE_TLOG_COMMIT_BYTES) {
Void _ = wait(uncommittedBytes->onChange());
}
}
if(r) tagPopped = std::max(tagPopped, r->popped());
auto tsm = self->tag_data.find(tag);
if (tsm == self->tag_data.end()) {
self->tag_data.insert( mapPair(std::move(Tag(tag)), TLogData::TagData(tagPopped, false, true, tag)) );
}
Void _ = wait(tLogPop( self, TLogPopRequest(tagPopped, tag) ));
updatePersistentPopped( self, tag, self->tag_data.find(tag)->value );
return Void();
}
ACTOR Future<Void> updateLogSystem(TLogData* self, LogSystemConfig recoverFrom, Reference<AsyncVar<Reference<ILogSystem>>> logSystem) {
loop {
TraceEvent("TLogUpdate", self->dbgid).detail("recoverFrom", recoverFrom.toString()).detail("dbInfo", self->dbInfo->get().logSystemConfig.toString());
if( self->dbInfo->get().logSystemConfig.isEqualIds(recoverFrom) ) {
logSystem->set(ILogSystem::fromLogSystemConfig( self->dbgid, self->dbInfo->get().myLocality, self->dbInfo->get().logSystemConfig ));
} else if( self->dbInfo->get().logSystemConfig.isNextGenerationOf(recoverFrom) && std::count( self->dbInfo->get().logSystemConfig.tLogs.begin(), self->dbInfo->get().logSystemConfig.tLogs.end(), self->dbgid ) ) {
logSystem->set(ILogSystem::fromOldLogSystemConfig( self->dbgid, self->dbInfo->get().myLocality, self->dbInfo->get().logSystemConfig ));
} else {
logSystem->set(Reference<ILogSystem>());
}
Void _ = wait( self->dbInfo->onChange() );
}
}
ACTOR Future<Void> recoverFromLogSystem( TLogData* self, LogSystemConfig recoverFrom, Version recoverAt, Version knownCommittedVersion, std::vector<Tag> recoverTags, Promise<Void> copyComplete ) {
state Future<Void> committing = Void();
state double lastCommitT = now();
state Reference<AsyncVar<int>> uncommittedBytes = Reference<AsyncVar<int>>(new AsyncVar<int>());
state std::vector<Future<Void>> recoverFutures;
state Reference<AsyncVar<Reference<ILogSystem>>> logSystem = Reference<AsyncVar<Reference<ILogSystem>>>(new AsyncVar<Reference<ILogSystem>>());
state Future<Void> updater = updateLogSystem(self, recoverFrom, logSystem);
for(auto tag : recoverTags )
recoverFutures.push_back(recoverTagFromLogSystem(self, knownCommittedVersion, recoverAt, tag, uncommittedBytes, logSystem));
state Future<Void> copyDone = waitForAll(recoverFutures);
state Future<Void> recoveryDone = Never();
state Future<Void> commitTimeout = delay(SERVER_KNOBS->LONG_TLOG_COMMIT_TIME);
loop {
choose {
when(Void _ = wait(copyDone)) {
recoverFutures.clear();
for(auto tag : recoverTags )
recoverFutures.push_back(recoverTagFromLogSystem(self, 0, knownCommittedVersion, tag, uncommittedBytes, logSystem));
copyDone = Never();
recoveryDone = waitForAll(recoverFutures);
Void __ = wait( committing );
Void __ = wait( self->updatePersist );
committing = self->persistentData->commit();
commitTimeout = delay(SERVER_KNOBS->LONG_TLOG_COMMIT_TIME);
uncommittedBytes->set(0);
Void __ = wait( committing );
TraceEvent("TLogCommitCopyData", self->dbgid);
if(!copyComplete.isSet())
copyComplete.send(Void());
}
when(Void _ = wait(recoveryDone)) { break; }
when(Void _ = wait(commitTimeout)) {
TEST(true); // We need to commit occasionally if this process is long to avoid running out of memory.
// We let one, but not more, commits pipeline with the network transfer
Void __ = wait( committing );
Void __ = wait( self->updatePersist );
committing = self->persistentData->commit();
commitTimeout = delay(SERVER_KNOBS->LONG_TLOG_COMMIT_TIME);
uncommittedBytes->set(0);
TraceEvent("TLogCommitRecoveryData", self->dbgid).detail("MemoryUsage", DEBUG_DETERMINISM ? 0 : getMemoryUsage());
}
when(Void _ = wait(uncommittedBytes->onChange())) {
if(uncommittedBytes->get() >= SERVER_KNOBS->LARGE_TLOG_COMMIT_BYTES)
commitTimeout = Void();
}
}
}
Void _ = wait( committing );
Void _ = wait( self->updatePersist );
Void _ = wait( self->persistentData->commit() );
TraceEvent("TLogRecoveryComplete", self->dbgid).detail("Locality", self->dbInfo->get().myLocality.toString());
TEST(true); // tLog restore from old log system completed
return Void();
}
ACTOR Future<Void> tLogStart( TLogData* self, LogSystemConfig recoverFrom, Version recoverAt, Version knownCommittedVersion, std::vector<Tag> recoverTags, bool recoverFromDisk,
TLogInterface tli, ReplyPromise<TLogInterface> outInterface, Promise<DBRecoveryCount> outRecoveryCount ) {
state Future<Void> recovery = Void();
if (recoverFrom.logSystemType == 1) {
ASSERT(false);
} else if (recoverFrom.logSystemType == 2) {
Void _ = wait( checkEmptyQueue(self) );
self->persistentDataVersion = recoverAt;
self->persistentDataDurableVersion = recoverAt; // durable is a white lie until initPersistentState() commits the store
self->queueCommittedVersion.set( recoverAt );
self->version.set( recoverAt );
Void _ = wait( initPersistentState( self ) );
state Promise<Void> copyComplete;
recovery = recoverFromLogSystem( self, recoverFrom, recoverAt, knownCommittedVersion, recoverTags, copyComplete );
Void _ = wait(copyComplete.getFuture());
} else if (recoverFromDisk) {
Void _ = wait( restorePersistentState( self, outRecoveryCount, true, tli ) );
TEST(true); // tLog restore from disk completed
} else {
// Brand new tlog, initialization has already been done by caller
Void _ = wait( checkEmptyQueue(self) );
Void _ = wait( initPersistentState( self ) );
}
TraceEvent("TLogReady", self->dbgid);
validate(self);
//dump(self);
outInterface.send( tli );
Void _ = wait( tLogCore( self, tli, recovery ) );
throw internal_error(); // tLogCore() shouldn't return without an error
}
ACTOR Future<Void> rejoinMasters( TLogData* self, TLogInterface tli, Future<DBRecoveryCount> fRecoveryCount ) {
state DBRecoveryCount recoveryCount = wait( fRecoveryCount );
state UID lastMasterID(0,0);
loop {
auto const& inf = self->dbInfo->get();
bool isDisplaced = inf.recoveryCount >= recoveryCount && inf.recoveryState != 0 &&
!std::count( inf.logSystemConfig.tLogs.begin(), inf.logSystemConfig.tLogs.end(), tli.id() ) &&
!std::count( inf.priorCommittedLogServers.begin(), inf.priorCommittedLogServers.end(), tli.id() );
for(int i = 0; i < inf.logSystemConfig.oldTLogs.size() && isDisplaced; i++) {
isDisplaced = !std::count( inf.logSystemConfig.oldTLogs[i].tLogs.begin(), inf.logSystemConfig.oldTLogs[i].tLogs.end(), tli.id() );
}
if ( isDisplaced )
{
TraceEvent("TLogDisplaced", tli.id()).detail("Reason", "DBInfoDoesNotContain");
if (BUGGIFY) Void _ = wait( delay( SERVER_KNOBS->BUGGIFY_WORKER_REMOVED_MAX_LAG * g_random->random01() ) );
throw worker_removed();
}
if (self->dbInfo->get().master.id() != lastMasterID) {
// The TLogRejoinRequest is needed to establish communications with a new master, which doesn't have our TLogInterface
TLogRejoinRequest req;
req.myInterface = tli;
TraceEvent("TLogRejoining", self->dbgid).detail("Master", self->dbInfo->get().master.id());
choose {
when ( bool success = wait( brokenPromiseToNever( self->dbInfo->get().master.tlogRejoin.getReply( req ) ) ) ) {
if (success)
lastMasterID = self->dbInfo->get().master.id();
}
when ( Void _ = wait( self->dbInfo->onChange() ) ) { }
}
} else
Void _ = wait( self->dbInfo->onChange() );
}
}
// Restore from disk
ACTOR Future<Void> tLog( IKeyValueStore* persistentData, IDiskQueue* persistentQueue, TLogInterface tli, Reference<AsyncVar<ServerDBInfo>> db ) {
state TLogData self( tli.id(), persistentData, persistentQueue, db );
state Promise<DBRecoveryCount> recoveryCount;
state Future<Void> removed = rejoinMasters(&self, tli, recoveryCount.getFuture());
Void _ = wait( tLogStart( &self, LogSystemConfig(), Version(0), Version(0), std::vector<Tag>(), true, tli, ReplyPromise<TLogInterface>(), recoveryCount ) || removed );
throw internal_error(); // tLogStart doesn't return without an error
}
}
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