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rocksdb/trace_replay/trace_replay.h

144 lines
4.2 KiB

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <memory>
#include <unordered_map>
#include <utility>
#include "rocksdb/env.h"
#include "rocksdb/options.h"
#include "rocksdb/trace_reader_writer.h"
namespace rocksdb {
// This file contains Tracer and Replayer classes that enable capturing and
// replaying RocksDB traces.
class ColumnFamilyHandle;
class ColumnFamilyData;
class DB;
class DBImpl;
class Slice;
class WriteBatch;
FIX #3278: Move global const object definitions from .h to .cc (#4691) Summary: Summary We should declare constants in headers and define them in source files. But this commit is only aimed at compound types. I don't know if it is necessary to do the same thing to fundamental types. I used this command to find all of the constant definitions in header files. `find . -name "*.h" | xargs grep -e "^const .*=.*"` And here is what I found: ``` ./db/version_edit.h:const uint64_t kFileNumberMask = 0x3FFFFFFFFFFFFFFF; ./include/rocksdb/env.h:const size_t kDefaultPageSize = 4 * 1024; ./include/rocksdb/statistics.h:const std::vector<std::pair<Tickers, std::string>> TickersNameMap = { ./include/rocksdb/statistics.h:const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = { ./include/rocksdb/table.h:const uint32_t kPlainTableVariableLength = 0; ./include/rocksdb/utilities/transaction_db.h:const uint32_t kInitialMaxDeadlocks = 5; ./port/port_posix.h:const uint32_t kMaxUint32 = std::numeric_limits<uint32_t>::max(); ./port/port_posix.h:const int kMaxInt32 = std::numeric_limits<int32_t>::max(); ./port/port_posix.h:const uint64_t kMaxUint64 = std::numeric_limits<uint64_t>::max(); ./port/port_posix.h:const int64_t kMaxInt64 = std::numeric_limits<int64_t>::max(); ./port/port_posix.h:const size_t kMaxSizet = std::numeric_limits<size_t>::max(); ./port/win/port_win.h:const uint32_t kMaxUint32 = UINT32_MAX; ./port/win/port_win.h:const int kMaxInt32 = INT32_MAX; ./port/win/port_win.h:const int64_t kMaxInt64 = INT64_MAX; ./port/win/port_win.h:const uint64_t kMaxUint64 = UINT64_MAX; ./port/win/port_win.h:const size_t kMaxSizet = UINT64_MAX; ./port/win/port_win.h:const size_t kMaxSizet = UINT_MAX; ./port/win/port_win.h:const uint32_t kMaxUint32 = std::numeric_limits<uint32_t>::max(); ./port/win/port_win.h:const int kMaxInt32 = std::numeric_limits<int>::max(); ./port/win/port_win.h:const uint64_t kMaxUint64 = std::numeric_limits<uint64_t>::max(); ./port/win/port_win.h:const int64_t kMaxInt64 = std::numeric_limits<int64_t>::max(); ./port/win/port_win.h:const size_t kMaxSizet = std::numeric_limits<size_t>::max(); ./port/win/port_win.h:const bool kLittleEndian = true; ./table/cuckoo_table_factory.h:const uint32_t kCuckooMurmurSeedMultiplier = 816922183; ./table/data_block_hash_index.h:const uint8_t kNoEntry = 255; ./table/data_block_hash_index.h:const uint8_t kCollision = 254; ./table/data_block_hash_index.h:const uint8_t kMaxRestartSupportedByHashIndex = 253; ./table/data_block_hash_index.h:const size_t kMaxBlockSizeSupportedByHashIndex = 1u << 16; ./table/data_block_hash_index.h:const double kDefaultUtilRatio = 0.75; ./table/filter_block.h:const uint64_t kNotValid = ULLONG_MAX; ./table/format.h:const int kMagicNumberLengthByte = 8; ./third-party/fbson/FbsonJsonParser.h:const char* const kJsonDelim = " ,]}\t\r\n"; ./third-party/fbson/FbsonJsonParser.h:const char* const kWhiteSpace = " \t\n\r"; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const BiggestInt kMaxBiggestInt = ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const char kDeathTestStyleFlag[] = "death_test_style"; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const char kDeathTestUseFork[] = "death_test_use_fork"; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const char kInternalRunDeathTestFlag[] = "internal_run_death_test"; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const char* pets[] = {"cat", "dog"}; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const size_t kProtobufOneLinerMaxLength = 50; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const int kMaxStackTraceDepth = 100; ./third-party/gtest-1.7.0/fused-src/gtest/gtest.h:const T* WithParamInterface<T>::parameter_ = NULL; ./util/coding.h:const unsigned int kMaxVarint64Length = 10; ./util/filename.h:const size_t kFormatFileNumberBufSize = 38; ./util/testutil.h:const SliceTransform* RandomSliceTransform(Random* rnd, int pre_defined = -1); ./util/trace_replay.h:const std::string kTraceMagic = "feedcafedeadbeef"; ./util/trace_replay.h:const unsigned int kTraceTimestampSize = 8; ./util/trace_replay.h:const unsigned int kTraceTypeSize = 1; ./util/trace_replay.h:const unsigned int kTracePayloadLengthSize = 4; ./util/trace_replay.h:const unsigned int kTraceMetadataSize = ./utilities/cassandra/serialize.h:const int64_t kCharMask = 0xFFLL; ./utilities/cassandra/serialize.h:const int32_t kBitsPerByte = 8; ``` And these 3 lines are related to this commit: ``` ./include/rocksdb/statistics.h:const std::vector<std::pair<Tickers, std::string>> TickersNameMap = { ./include/rocksdb/statistics.h:const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = { ./util/trace_replay.h:const std::string kTraceMagic = "feedcafedeadbeef"; ``` Any comments would be appreciated. Thanks. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4691 Differential Revision: D13208049 Pulled By: ajkr fbshipit-source-id: e5ee55fdaec5447fc5798c6721e2821e7cdc0d5b
6 years ago
extern const std::string kTraceMagic;
const unsigned int kTraceTimestampSize = 8;
const unsigned int kTraceTypeSize = 1;
const unsigned int kTracePayloadLengthSize = 4;
const unsigned int kTraceMetadataSize =
kTraceTimestampSize + kTraceTypeSize + kTracePayloadLengthSize;
// Supported Trace types.
enum TraceType : char {
kTraceBegin = 1,
kTraceEnd = 2,
kTraceWrite = 3,
kTraceGet = 4,
kTraceIteratorSeek = 5,
kTraceIteratorSeekForPrev = 6,
// All trace types should be added before kTraceMax
kTraceMax,
};
// TODO: This should also be made part of public interface to help users build
// custom TracerReaders and TraceWriters.
//
// The data structure that defines a single trace.
struct Trace {
uint64_t ts; // timestamp
TraceType type;
std::string payload;
void reset() {
ts = 0;
type = kTraceMax;
payload.clear();
}
};
// Tracer captures all RocksDB operations using a user-provided TraceWriter.
// Every RocksDB operation is written as a single trace. Each trace will have a
// timestamp and type, followed by the trace payload.
class Tracer {
public:
Tracer(Env* env, const TraceOptions& trace_options,
std::unique_ptr<TraceWriter>&& trace_writer);
~Tracer();
// Trace all write operations -- Put, Merge, Delete, SingleDelete, Write
Status Write(WriteBatch* write_batch);
// Trace Get operations.
Status Get(ColumnFamilyHandle* cfname, const Slice& key);
// Trace Iterators.
Status IteratorSeek(const uint32_t& cf_id, const Slice& key);
Status IteratorSeekForPrev(const uint32_t& cf_id, const Slice& key);
// Returns true if the trace is over the configured max trace file limit.
// False otherwise.
bool IsTraceFileOverMax();
// Writes a trace footer at the end of the tracing
Status Close();
private:
// Write a trace header at the beginning, typically on initiating a trace,
// with some metadata like a magic number, trace version, RocksDB version, and
// trace format.
Status WriteHeader();
// Write a trace footer, typically on ending a trace, with some metadata.
Status WriteFooter();
// Write a single trace using the provided TraceWriter to the underlying
// system, say, a filesystem or a streaming service.
Status WriteTrace(const Trace& trace);
// Helps in filtering and sampling of traces.
// Returns true if a trace should be skipped, false otherwise.
bool ShouldSkipTrace(const TraceType& type);
Env* env_;
TraceOptions trace_options_;
std::unique_ptr<TraceWriter> trace_writer_;
uint64_t trace_request_count_;
};
// Replayer helps to replay the captured RocksDB operations, using a user
// provided TraceReader.
// The Replayer is instantiated via db_bench today, on using "replay" benchmark.
class Replayer {
public:
Replayer(DB* db, const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader);
~Replayer();
// Replay all the traces from the provided trace stream, taking the delay
// between the traces into consideration.
Status Replay();
// Enables fast forwarding a replay by reducing the delay between the ingested
// traces.
// fast_forward : Rate of replay speedup.
// If 1, replay the operations at the same rate as in the trace stream.
// If > 1, speed up the replay by this amount.
Status SetFastForward(uint32_t fast_forward);
private:
Status ReadHeader(Trace* header);
Status ReadFooter(Trace* footer);
Status ReadTrace(Trace* trace);
DBImpl* db_;
std::unique_ptr<TraceReader> trace_reader_;
std::unordered_map<uint32_t, ColumnFamilyHandle*> cf_map_;
uint32_t fast_forward_;
};
} // namespace rocksdb