495 lines
18 KiB
C++
495 lines
18 KiB
C++
/*
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* StorageServerInterface.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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// TODO this should really be renamed "TSSComparison.cpp"
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#include "fdbclient/StorageServerInterface.h"
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#include "fdbclient/BlobWorkerInterface.h"
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#include "flow/crc32c.h" // for crc32c_append, to checksum values in tss trace events
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// Includes template specializations for all tss operations on storage server types.
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// New StorageServerInterface reply types must be added here or it won't compile.
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// if size + hex of checksum is shorter than value, record that instead of actual value. break-even point is 12
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// characters
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std::string traceChecksumValue(ValueRef s) {
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return s.size() > 12 ? format("(%d)%08x", s.size(), crc32c_append(0, s.begin(), s.size())) : s.toString();
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}
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// point reads
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template <>
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bool TSS_doCompare(const GetValueReply& src, const GetValueReply& tss) {
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return src.value.present() == tss.value.present() && (!src.value.present() || src.value.get() == tss.value.get());
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}
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template <>
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const char* TSS_mismatchTraceName(const GetValueRequest& req) {
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return "TSSMismatchGetValue";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const GetValueRequest& req,
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const GetValueReply& src,
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const GetValueReply& tss) {
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event.detail("Key", req.key.printable())
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.detail("Version", req.version)
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.detail("SSReply", src.value.present() ? traceChecksumValue(src.value.get()) : "missing")
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.detail("TSSReply", tss.value.present() ? traceChecksumValue(tss.value.get()) : "missing");
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}
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// key selector reads
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template <>
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bool TSS_doCompare(const GetKeyReply& src, const GetKeyReply& tss) {
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// This process is a bit complicated. Since the tss and ss can return different results if neighboring shards to
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// req.sel.key are currently being moved, We validate that the results are the same IF the returned key selectors
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// are final. Otherwise, we only mark the request as a mismatch if the difference between the two returned key
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// selectors could ONLY be because of different results from the storage engines. We can afford to only partially
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// check key selectors that start in a TSS shard and end in a non-TSS shard because the other read queries and the
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// consistency check will eventually catch a misbehaving storage engine.
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bool matches = true;
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if (src.sel.orEqual == tss.sel.orEqual && src.sel.offset == tss.sel.offset) {
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// full matching case
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if (src.sel.offset == 0 && src.sel.orEqual) {
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// found exact key, should be identical
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matches = src.sel.getKey() == tss.sel.getKey();
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}
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// if the query doesn't return the final key, there is an edge case where the ss and tss have different shard
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// boundaries, so they pass different shard boundary keys back for the same offset
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} else if (src.sel.getKey() == tss.sel.getKey()) {
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// There is one case with a positive offset where the shard boundary the incomplete query stopped at is the next
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// key in the shard that the complete query returned. This is not possible with a negative offset because the
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// shard boundary is exclusive backwards
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if (src.sel.offset == 0 && src.sel.orEqual && tss.sel.offset == 1 && !tss.sel.orEqual) {
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// case where ss was complete and tss was incomplete
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} else if (tss.sel.offset == 0 && tss.sel.orEqual && src.sel.offset == 1 && !src.sel.orEqual) {
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// case where tss was complete and ss was incomplete
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} else {
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matches = false;
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}
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} else {
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// ss/tss returned different keys, and different offsets and/or orEqual
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// here we just validate that ordering of the keys matches the ordering of the offsets
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bool tssKeyLarger = src.sel.getKey() < tss.sel.getKey();
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// the only case offsets are equal and orEqual aren't equal is the case with a negative offset,
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// where one response has <=0 with the actual result and the other has <0 with the shard upper boundary.
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// So whichever one has the actual result should have the lower key.
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bool tssOffsetLarger = (src.sel.offset == tss.sel.offset) ? tss.sel.orEqual : src.sel.offset < tss.sel.offset;
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matches = tssKeyLarger != tssOffsetLarger;
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}
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return matches;
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}
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template <>
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const char* TSS_mismatchTraceName(const GetKeyRequest& req) {
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return "TSSMismatchGetKey";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event, const GetKeyRequest& req, const GetKeyReply& src, const GetKeyReply& tss) {
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event
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.detail("KeySelector",
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format("%s%s:%d", req.sel.orEqual ? "=" : "", req.sel.getKey().printable().c_str(), req.sel.offset))
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.detail("Version", req.version)
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.detail("SSReply",
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format("%s%s:%d", src.sel.orEqual ? "=" : "", src.sel.getKey().printable().c_str(), src.sel.offset))
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.detail("TSSReply",
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format("%s%s:%d", tss.sel.orEqual ? "=" : "", tss.sel.getKey().printable().c_str(), tss.sel.offset));
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}
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// range reads
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template <>
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bool TSS_doCompare(const GetKeyValuesReply& src, const GetKeyValuesReply& tss) {
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return src.more == tss.more && src.data == tss.data;
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}
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template <>
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const char* TSS_mismatchTraceName(const GetKeyValuesRequest& req) {
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return "TSSMismatchGetKeyValues";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const GetKeyValuesRequest& req,
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const GetKeyValuesReply& src,
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const GetKeyValuesReply& tss) {
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std::string ssResultsString = format("(%d)%s:\n", src.data.size(), src.more ? "+" : "");
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for (auto& it : src.data) {
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ssResultsString += "\n" + it.key.printable() + "=" + traceChecksumValue(it.value);
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}
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std::string tssResultsString = format("(%d)%s:\n", tss.data.size(), tss.more ? "+" : "");
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for (auto& it : tss.data) {
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tssResultsString += "\n" + it.key.printable() + "=" + traceChecksumValue(it.value);
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}
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event
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.detail(
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"Begin",
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format("%s%s:%d", req.begin.orEqual ? "=" : "", req.begin.getKey().printable().c_str(), req.begin.offset))
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.detail("End",
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format("%s%s:%d", req.end.orEqual ? "=" : "", req.end.getKey().printable().c_str(), req.end.offset))
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.detail("Version", req.version)
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.detail("Limit", req.limit)
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.detail("LimitBytes", req.limitBytes)
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.setMaxFieldLength(FLOW_KNOBS->TSS_LARGE_TRACE_SIZE * 4 / 10)
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.detail("SSReply", ssResultsString)
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.detail("TSSReply", tssResultsString);
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}
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// streaming range reads
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template <>
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bool TSS_doCompare(const GetKeyValuesStreamReply& src, const GetKeyValuesStreamReply& tss) {
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return src.more == tss.more && src.data == tss.data;
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}
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template <>
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const char* TSS_mismatchTraceName(const GetKeyValuesStreamRequest& req) {
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return "TSSMismatchGetKeyValuesStream";
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}
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// TODO this is all duplicated from above, simplify?
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const GetKeyValuesStreamRequest& req,
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const GetKeyValuesStreamReply& src,
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const GetKeyValuesStreamReply& tss) {
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std::string ssResultsString = format("(%d)%s:\n", src.data.size(), src.more ? "+" : "");
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for (auto& it : src.data) {
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ssResultsString += "\n" + it.key.printable() + "=" + traceChecksumValue(it.value);
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}
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std::string tssResultsString = format("(%d)%s:\n", tss.data.size(), tss.more ? "+" : "");
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for (auto& it : tss.data) {
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tssResultsString += "\n" + it.key.printable() + "=" + traceChecksumValue(it.value);
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}
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event
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.detail(
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"Begin",
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format("%s%s:%d", req.begin.orEqual ? "=" : "", req.begin.getKey().printable().c_str(), req.begin.offset))
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.detail("End",
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format("%s%s:%d", req.end.orEqual ? "=" : "", req.end.getKey().printable().c_str(), req.end.offset))
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.detail("Version", req.version)
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.detail("Limit", req.limit)
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.detail("LimitBytes", req.limitBytes)
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.setMaxFieldLength(FLOW_KNOBS->TSS_LARGE_TRACE_SIZE * 4 / 10)
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.detail("SSReply", ssResultsString)
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.detail("TSSReply", tssResultsString);
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}
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template <>
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bool TSS_doCompare(const WatchValueReply& src, const WatchValueReply& tss) {
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// We duplicate watches just for load, no need to validate replies.
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const WatchValueRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const WatchValueRequest& req,
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const WatchValueReply& src,
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const WatchValueReply& tss) {
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ASSERT(false);
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}
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template <>
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bool TSS_doCompare(const SplitMetricsReply& src, const SplitMetricsReply& tss) {
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// We duplicate split metrics just for load, no need to validate replies.
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const SplitMetricsRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const SplitMetricsRequest& req,
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const SplitMetricsReply& src,
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const SplitMetricsReply& tss) {
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ASSERT(false);
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}
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template <>
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bool TSS_doCompare(const ReadHotSubRangeReply& src, const ReadHotSubRangeReply& tss) {
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// We duplicate read hot sub range metrics just for load, no need to validate replies.
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const ReadHotSubRangeRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const ReadHotSubRangeRequest& req,
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const ReadHotSubRangeReply& src,
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const ReadHotSubRangeReply& tss) {
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ASSERT(false);
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}
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template <>
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bool TSS_doCompare(const SplitRangeReply& src, const SplitRangeReply& tss) {
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// We duplicate read hot sub range metrics just for load, no need to validate replies.
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const SplitRangeRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const SplitRangeRequest& req,
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const SplitRangeReply& src,
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const SplitRangeReply& tss) {
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ASSERT(false);
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}
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// change feed
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template <>
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bool TSS_doCompare(const OverlappingChangeFeedsReply& src, const OverlappingChangeFeedsReply& tss) {
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ASSERT(false);
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const OverlappingChangeFeedsRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const OverlappingChangeFeedsRequest& req,
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const OverlappingChangeFeedsReply& src,
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const OverlappingChangeFeedsReply& tss) {
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ASSERT(false);
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}
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// template specializations for metrics replies that should never be called because these requests aren't duplicated
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// storage metrics
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template <>
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bool TSS_doCompare(const StorageMetrics& src, const StorageMetrics& tss) {
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ASSERT(false);
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const WaitMetricsRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const WaitMetricsRequest& req,
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const StorageMetrics& src,
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const StorageMetrics& tss) {
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ASSERT(false);
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}
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template <>
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bool TSS_doCompare(const BlobGranuleFileReply& src, const BlobGranuleFileReply& tss) {
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ASSERT(false);
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return true;
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}
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template <>
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const char* TSS_mismatchTraceName(const BlobGranuleFileRequest& req) {
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ASSERT(false);
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return "";
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}
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template <>
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void TSS_traceMismatch(TraceEvent& event,
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const BlobGranuleFileRequest& req,
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const BlobGranuleFileReply& src,
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const BlobGranuleFileReply& tss) {
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ASSERT(false);
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}
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// only record metrics for data reads
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template <>
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void TSSMetrics::recordLatency(const GetValueRequest& req, double ssLatency, double tssLatency) {
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SSgetValueLatency.addSample(ssLatency);
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TSSgetValueLatency.addSample(tssLatency);
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}
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template <>
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void TSSMetrics::recordLatency(const GetKeyRequest& req, double ssLatency, double tssLatency) {
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SSgetKeyLatency.addSample(ssLatency);
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TSSgetKeyLatency.addSample(tssLatency);
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}
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template <>
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void TSSMetrics::recordLatency(const GetKeyValuesRequest& req, double ssLatency, double tssLatency) {
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SSgetKeyValuesLatency.addSample(ssLatency);
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TSSgetKeyValuesLatency.addSample(tssLatency);
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}
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template <>
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void TSSMetrics::recordLatency(const WatchValueRequest& req, double ssLatency, double tssLatency) {}
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template <>
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void TSSMetrics::recordLatency(const WaitMetricsRequest& req, double ssLatency, double tssLatency) {}
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template <>
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void TSSMetrics::recordLatency(const SplitMetricsRequest& req, double ssLatency, double tssLatency) {}
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template <>
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void TSSMetrics::recordLatency(const ReadHotSubRangeRequest& req, double ssLatency, double tssLatency) {}
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template <>
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void TSSMetrics::recordLatency(const SplitRangeRequest& req, double ssLatency, double tssLatency) {}
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template <>
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void TSSMetrics::recordLatency(const GetKeyValuesStreamRequest& req, double ssLatency, double tssLatency) {}
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template <>
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void TSSMetrics::recordLatency(const OverlappingChangeFeedsRequest& req, double ssLatency, double tssLatency) {}
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// this isn't even to storage servers
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template <>
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void TSSMetrics::recordLatency(const BlobGranuleFileRequest& req, double ssLatency, double tssLatency) {}
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// -------------------
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TEST_CASE("/StorageServerInterface/TSSCompare/TestComparison") {
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printf("testing tss comparisons\n");
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// to avoid compiler issues that StringRef(char* is deprecated)
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std::string s_a = "a";
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std::string s_b = "b";
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std::string s_c = "c";
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std::string s_d = "d";
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std::string s_e = "e";
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UID tssId;
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GetValueReply gvReplyMissing;
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GetValueReply gvReplyA(Optional<Value>(StringRef(s_a)), false);
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GetValueReply gvReplyB(Optional<Value>(StringRef(s_b)), false);
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ASSERT(TSS_doCompare(gvReplyMissing, gvReplyMissing));
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ASSERT(TSS_doCompare(gvReplyA, gvReplyA));
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ASSERT(TSS_doCompare(gvReplyB, gvReplyB));
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ASSERT(!TSS_doCompare(gvReplyMissing, gvReplyA));
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ASSERT(!TSS_doCompare(gvReplyA, gvReplyB));
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// test GetKeyValues
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Arena a;
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GetKeyValuesReply gkvReplyEmpty;
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GetKeyValuesReply gkvReplyOne;
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KeyValueRef v;
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v.key = StringRef(a, s_a);
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v.value = StringRef(a, s_b);
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gkvReplyOne.data.push_back_deep(gkvReplyOne.arena, v);
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GetKeyValuesReply gkvReplyOneMore;
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gkvReplyOneMore.data.push_back_deep(gkvReplyOneMore.arena, v);
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gkvReplyOneMore.more = true;
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ASSERT(TSS_doCompare(gkvReplyEmpty, gkvReplyEmpty));
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ASSERT(TSS_doCompare(gkvReplyOne, gkvReplyOne));
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ASSERT(TSS_doCompare(gkvReplyOneMore, gkvReplyOneMore));
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ASSERT(!TSS_doCompare(gkvReplyEmpty, gkvReplyOne));
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ASSERT(!TSS_doCompare(gkvReplyOne, gkvReplyOneMore));
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GetKeyReply gkReplyA(KeySelectorRef(StringRef(a, s_a), false, 20), false);
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GetKeyReply gkReplyB(KeySelectorRef(StringRef(a, s_b), false, 10), false);
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GetKeyReply gkReplyC(KeySelectorRef(StringRef(a, s_c), true, 0), false);
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GetKeyReply gkReplyD(KeySelectorRef(StringRef(a, s_d), false, -10), false);
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GetKeyReply gkReplyE(KeySelectorRef(StringRef(a, s_e), false, -20), false);
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// identical cases
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ASSERT(TSS_doCompare(gkReplyA, gkReplyA));
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ASSERT(TSS_doCompare(gkReplyB, gkReplyB));
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ASSERT(TSS_doCompare(gkReplyC, gkReplyC));
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ASSERT(TSS_doCompare(gkReplyD, gkReplyD));
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ASSERT(TSS_doCompare(gkReplyE, gkReplyE));
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// relative offset cases
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ASSERT(TSS_doCompare(gkReplyA, gkReplyB));
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ASSERT(TSS_doCompare(gkReplyB, gkReplyA));
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ASSERT(TSS_doCompare(gkReplyA, gkReplyC));
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ASSERT(TSS_doCompare(gkReplyC, gkReplyA));
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ASSERT(TSS_doCompare(gkReplyB, gkReplyC));
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ASSERT(TSS_doCompare(gkReplyC, gkReplyB));
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ASSERT(TSS_doCompare(gkReplyC, gkReplyD));
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ASSERT(TSS_doCompare(gkReplyD, gkReplyC));
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ASSERT(TSS_doCompare(gkReplyC, gkReplyE));
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ASSERT(TSS_doCompare(gkReplyE, gkReplyC));
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ASSERT(TSS_doCompare(gkReplyD, gkReplyE));
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ASSERT(TSS_doCompare(gkReplyE, gkReplyD));
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// test same offset/orEqual wrong key
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ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
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GetKeyReply(KeySelectorRef(StringRef(a, s_b), true, 0), false)));
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// this could be from different shard boundaries, so don't say it's a mismatch
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ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 10), false),
|
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GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 10), false)));
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|
|
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// test offsets and key difference don't match
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ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 0), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 10), false)));
|
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ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, -10), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 0), false)));
|
|
|
|
// test key is next over in one shard, one found it and other didn't
|
|
// positive
|
|
// one that didn't find is +1
|
|
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 1), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_b), true, 0), false)));
|
|
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 1), false)));
|
|
|
|
// negative will have zero offset but not equal set
|
|
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 0), false)));
|
|
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 0), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_b), true, 0), false)));
|
|
|
|
// test shard boundary key returned by incomplete query is the same as the key found by the other (only possible in
|
|
// positive direction)
|
|
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
|
|
GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 1), false)));
|
|
|
|
// explictly test checksum function
|
|
std::string s12 = "ABCDEFGHIJKL";
|
|
std::string s13 = "ABCDEFGHIJKLO";
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|
std::string checksumStart13 = "(13)";
|
|
ASSERT(s_a == traceChecksumValue(StringRef(s_a)));
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|
ASSERT(s12 == traceChecksumValue(StringRef(s12)));
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|
ASSERT(checksumStart13 == traceChecksumValue(StringRef(s13)).substr(0, 4));
|
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return Void();
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|
}
|