6d75319d95
Summary: In the current trace_and replay, Get an WriteBatch are traced. This pull request track down the Seek() and SeekForPrev() to the trace file. <target_key, timestamp, column_family_id> are write to the file. Replay of Iterator is not supported in the current implementation. Tested with trace_analyzer. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4228 Differential Revision: D9201381 Pulled By: zhichao-cao fbshipit-source-id: 6f9cc9cb3c20260af741bee065ec35c5c96354ab
97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <memory>
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#include <unordered_map>
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#include <utility>
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#include "rocksdb/env.h"
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#include "rocksdb/trace_reader_writer.h"
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namespace rocksdb {
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class ColumnFamilyHandle;
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class ColumnFamilyData;
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class DB;
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class DBImpl;
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class Slice;
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class WriteBatch;
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const std::string kTraceMagic = "feedcafedeadbeef";
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const unsigned int kTraceTimestampSize = 8;
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const unsigned int kTraceTypeSize = 1;
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const unsigned int kTracePayloadLengthSize = 4;
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const unsigned int kTraceMetadataSize =
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kTraceTimestampSize + kTraceTypeSize + kTracePayloadLengthSize;
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enum TraceType : char {
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kTraceBegin = 1,
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kTraceEnd = 2,
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kTraceWrite = 3,
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kTraceGet = 4,
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kTraceIteratorSeek = 5,
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kTraceIteratorSeekForPrev = 6,
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kTraceMax,
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};
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// TODO: This should also be made part of public interface to help users build
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// custom TracerReaders and TraceWriters.
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struct Trace {
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uint64_t ts;
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TraceType type;
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std::string payload;
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void reset() {
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ts = 0;
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type = kTraceMax;
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payload.clear();
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}
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};
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// Trace RocksDB operations using a TraceWriter.
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class Tracer {
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public:
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Tracer(Env* env, std::unique_ptr<TraceWriter>&& trace_writer);
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~Tracer();
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Status Write(WriteBatch* write_batch);
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Status Get(ColumnFamilyHandle* cfname, const Slice& key);
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Status IteratorSeek(const uint32_t& cf_id, const Slice& key);
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Status IteratorSeekForPrev(const uint32_t& cf_id, const Slice& key);
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Status Close();
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private:
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Status WriteHeader();
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Status WriteFooter();
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Status WriteTrace(const Trace& trace);
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Env* env_;
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unique_ptr<TraceWriter> trace_writer_;
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};
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// Replay RocksDB operations from a trace.
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class Replayer {
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public:
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Replayer(DB* db, const std::vector<ColumnFamilyHandle*>& handles,
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std::unique_ptr<TraceReader>&& reader);
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~Replayer();
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Status Replay();
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private:
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Status ReadHeader(Trace* header);
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Status ReadFooter(Trace* footer);
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Status ReadTrace(Trace* trace);
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DBImpl* db_;
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std::unique_ptr<TraceReader> trace_reader_;
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std::unordered_map<uint32_t, ColumnFamilyHandle*> cf_map_;
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};
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} // namespace rocksdb
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