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Make TraceRecord and Replayer public (#8611)

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Summary:
New public interfaces:
`TraceRecord` and `TraceRecord::Handler`, available in "rocksdb/trace_record.h".
`Replayer`, available in `rocksdb/utilities/replayer.h`.

User can use `DB::NewDefaultReplayer()` to create a Replayer to auto/manual replay a trace file.

Unit tests:
- `./db_test2 --gtest_filter="DBTest2.TraceAndReplay"`: Updated with the internal API changes.
- `./db_test2 --gtest_filter="DBTest2.TraceAndManualReplay"`: New for manual replay.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8611

Reviewed By: ajkr

Differential Revision: D30266329

Pulled By: autopear

fbshipit-source-id: 1ecb3cbbedae0f6a67c18f0cc82e002b4d81b6f8
This commit is contained in:
Merlin Mao 2021-08-11 19:31:44 -07:00 committed by Facebook GitHub Bot
parent a53563d86e
commit f58d276764
36 changed files with 1677 additions and 778 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
CMakeLists.txt
View File

@ -816,9 +816,11 @@ set(SOURCES
tools/ldb_tool.cc
tools/sst_dump_tool.cc
tools/trace_analyzer_tool.cc
trace_replay/trace_replay.cc
trace_replay/block_cache_tracer.cc
trace_replay/io_tracer.cc
trace_replay/trace_record_handler.cc
trace_replay/trace_record.cc
trace_replay/trace_replay.cc
util/coding.cc
util/compaction_job_stats_impl.cc
util/comparator.cc
@ -878,6 +880,7 @@ set(SOURCES
utilities/simulator_cache/sim_cache.cc
utilities/table_properties_collectors/compact_on_deletion_collector.cc
utilities/trace/file_trace_reader_writer.cc
utilities/trace/replayer_impl.cc
utilities/transactions/lock/lock_manager.cc
utilities/transactions/lock/point/point_lock_tracker.cc
utilities/transactions/lock/point/point_lock_manager.cc

4
HISTORY.md
View File

@ -15,6 +15,10 @@
* BlockBasedTableOptions.prepopulate_block_cache can be dynamically configured using DB::SetOptions.
* Add CompactionOptionsFIFO.age_for_warm, which allows RocksDB to move old files to warm tier in FIFO compactions. Note that file temperature is still an experimental feature.
* Add a comment to suggest btrfs user to disable file preallocation by setting `options.allow_fallocate=false`.
* Fast forward option in Trace replay changed to double type to allow replaying at a lower speed, by settings the value between 0 and 1. This option can be set via `ReplayOptions` in `Replayer::Replay()`, or via `--trace_replay_fast_forward` in db_bench.
## Public API change
* Added APIs to decode and replay trace file via Replayer class. Added `DB::NewDefaultReplayer()` to create a default Replayer instance. Created trace_record.h and utilities/replayer.h files to access decoded Trace records and replay them.
### Performance Improvements
* Try to avoid updating DBOptions if `SetDBOptions()` does not change any option value.

6
TARGETS
View File

@ -335,6 +335,8 @@ cpp_library(
"tools/sst_dump_tool.cc",
"trace_replay/block_cache_tracer.cc",
"trace_replay/io_tracer.cc",
"trace_replay/trace_record.cc",
"trace_replay/trace_record_handler.cc",
"trace_replay/trace_replay.cc",
"util/build_version.cc",
"util/coding.cc",
@ -398,6 +400,7 @@ cpp_library(
"utilities/simulator_cache/sim_cache.cc",
"utilities/table_properties_collectors/compact_on_deletion_collector.cc",
"utilities/trace/file_trace_reader_writer.cc",
"utilities/trace/replayer_impl.cc",
"utilities/transactions/lock/lock_manager.cc",
"utilities/transactions/lock/point/point_lock_manager.cc",
"utilities/transactions/lock/point/point_lock_tracker.cc",
@ -650,6 +653,8 @@ cpp_library(
"tools/sst_dump_tool.cc",
"trace_replay/block_cache_tracer.cc",
"trace_replay/io_tracer.cc",
"trace_replay/trace_record.cc",
"trace_replay/trace_record_handler.cc",
"trace_replay/trace_replay.cc",
"util/build_version.cc",
"util/coding.cc",
@ -713,6 +718,7 @@ cpp_library(
"utilities/simulator_cache/sim_cache.cc",
"utilities/table_properties_collectors/compact_on_deletion_collector.cc",
"utilities/trace/file_trace_reader_writer.cc",
"utilities/trace/replayer_impl.cc",
"utilities/transactions/lock/lock_manager.cc",
"utilities/transactions/lock/point/point_lock_manager.cc",
"utilities/transactions/lock/point/point_lock_tracker.cc",

12
db/db_impl/db_impl.cc
View File

@ -94,6 +94,7 @@
#include "table/table_builder.h"
#include "table/two_level_iterator.h"
#include "test_util/sync_point.h"
#include "trace_replay/trace_replay.h"
#include "util/autovector.h"
#include "util/cast_util.h"
#include "util/coding.h"
@ -103,6 +104,7 @@
#include "util/mutexlock.h"
#include "util/stop_watch.h"
#include "util/string_util.h"
#include "utilities/trace/replayer_impl.h"
namespace ROCKSDB_NAMESPACE {
@ -4359,9 +4361,7 @@ SequenceNumber DBImpl::GetEarliestMemTableSequenceNumber(SuperVersion* sv,
return earliest_seq;
}
#endif // ROCKSDB_LITE
#ifndef ROCKSDB_LITE
Status DBImpl::GetLatestSequenceForKey(SuperVersion* sv, const Slice& key,
bool cache_only,
SequenceNumber lower_bound_seq,
@ -5108,6 +5108,14 @@ Status DBImpl::EndTrace() {
return s;
}
Status DBImpl::NewDefaultReplayer(
const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader,
std::unique_ptr<Replayer>* replayer) {
replayer->reset(new ReplayerImpl(this, handles, std::move(reader)));
return Status::OK();
}
Status DBImpl::StartBlockCacheTrace(
const TraceOptions& trace_options,
std::unique_ptr<TraceWriter>&& trace_writer) {

11
db/db_impl/db_impl.h
View File

@ -51,8 +51,13 @@
#include "rocksdb/env.h"
#include "rocksdb/memtablerep.h"
#include "rocksdb/status.h"
#ifndef ROCKSDB_LITE
#include "rocksdb/trace_reader_writer.h"
#endif // ROCKSDB_LITE
#include "rocksdb/transaction_log.h"
#ifndef ROCKSDB_LITE
#include "rocksdb/utilities/replayer.h"
#endif // ROCKSDB_LITE
#include "rocksdb/write_buffer_manager.h"
#include "table/merging_iterator.h"
#include "table/scoped_arena_iterator.h"
@ -464,6 +469,12 @@ class DBImpl : public DB {
using DB::EndTrace;
virtual Status EndTrace() override;
using DB::NewDefaultReplayer;
virtual Status NewDefaultReplayer(
const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader,
std::unique_ptr<Replayer>* replayer) override;
using DB::StartBlockCacheTrace;
Status StartBlockCacheTrace(
const TraceOptions& options,

260
db/db_test2.cc
View File

@ -17,6 +17,7 @@
#include "port/port.h"
#include "port/stack_trace.h"
#include "rocksdb/persistent_cache.h"
#include "rocksdb/utilities/replayer.h"
#include "rocksdb/wal_filter.h"
#include "util/random.h"
#include "utilities/fault_injection_env.h"
@ -4256,8 +4257,16 @@ TEST_F(DBTest2, TraceAndReplay) {
std::unique_ptr<TraceReader> trace_reader;
ASSERT_OK(NewFileTraceReader(env_, env_opts, trace_filename, &trace_reader));
Replayer replayer(db2, handles_, std::move(trace_reader));
ASSERT_OK(replayer.Replay());
std::unique_ptr<Replayer> replayer;
ASSERT_OK(
db2->NewDefaultReplayer(handles, std::move(trace_reader), &replayer));
// Unprepared replay should fail with Status::Incomplete()
ASSERT_TRUE(replayer->Replay().IsIncomplete());
ASSERT_OK(replayer->Prepare());
// Ok to repeatedly Prepare().
ASSERT_OK(replayer->Prepare());
// Replay using 1 thread, 1x speed.
ASSERT_OK(replayer->Replay());
ASSERT_OK(db2->Get(ro, handles[0], "a", &value));
ASSERT_EQ("1", value);
@ -4271,6 +4280,229 @@ TEST_F(DBTest2, TraceAndReplay) {
ASSERT_OK(db2->Get(ro, handles[1], "rocksdb", &value));
ASSERT_EQ("rocks", value);
// Re-replay should fail with Status::Incomplete() if Prepare() was not
// called. Currently we don't distinguish between unprepared and trace end.
ASSERT_TRUE(replayer->Replay().IsIncomplete());
// Re-replay using 2 threads, 2x speed.
ASSERT_OK(replayer->Prepare());
ASSERT_OK(replayer->Replay(ReplayOptions(2, 2.0)));
// Re-replay using 2 threads, 1/2 speed.
ASSERT_OK(replayer->Prepare());
ASSERT_OK(replayer->Replay(ReplayOptions(2, 0.5)));
replayer.reset();
for (auto handle : handles) {
delete handle;
}
delete db2;
ASSERT_OK(DestroyDB(dbname2, options));
}
TEST_F(DBTest2, TraceAndManualReplay) {
Options options = CurrentOptions();
options.merge_operator = MergeOperators::CreatePutOperator();
ReadOptions ro;
WriteOptions wo;
TraceOptions trace_opts;
EnvOptions env_opts;
CreateAndReopenWithCF({"pikachu"}, options);
Random rnd(301);
Iterator* single_iter = nullptr;
ASSERT_TRUE(db_->EndTrace().IsIOError());
std::string trace_filename = dbname_ + "/rocksdb.trace";
std::unique_ptr<TraceWriter> trace_writer;
ASSERT_OK(NewFileTraceWriter(env_, env_opts, trace_filename, &trace_writer));
ASSERT_OK(db_->StartTrace(trace_opts, std::move(trace_writer)));
ASSERT_OK(Put(0, "a", "1"));
ASSERT_OK(Merge(0, "b", "2"));
ASSERT_OK(Delete(0, "c"));
ASSERT_OK(SingleDelete(0, "d"));
ASSERT_OK(db_->DeleteRange(wo, dbfull()->DefaultColumnFamily(), "e", "f"));
WriteBatch batch;
ASSERT_OK(batch.Put("f", "11"));
ASSERT_OK(batch.Merge("g", "12"));
ASSERT_OK(batch.Delete("h"));
ASSERT_OK(batch.SingleDelete("i"));
ASSERT_OK(batch.DeleteRange("j", "k"));
ASSERT_OK(db_->Write(wo, &batch));
single_iter = db_->NewIterator(ro);
single_iter->Seek("f");
single_iter->SeekForPrev("g");
delete single_iter;
ASSERT_EQ("1", Get(0, "a"));
ASSERT_EQ("12", Get(0, "g"));
ASSERT_OK(Put(1, "foo", "bar"));
ASSERT_OK(Put(1, "rocksdb", "rocks"));
ASSERT_EQ("NOT_FOUND", Get(1, "leveldb"));
ASSERT_OK(db_->EndTrace());
// These should not get into the trace file as it is after EndTrace.
Put("hello", "world");
Merge("foo", "bar");
// Open another db, replay, and verify the data
std::string value;
std::string dbname2 = test::PerThreadDBPath(env_, "/db_replay");
ASSERT_OK(DestroyDB(dbname2, options));
// Using a different name than db2, to pacify infer's use-after-lifetime
// warnings (http://fbinfer.com).
DB* db2_init = nullptr;
options.create_if_missing = true;
ASSERT_OK(DB::Open(options, dbname2, &db2_init));
ColumnFamilyHandle* cf;
ASSERT_OK(
db2_init->CreateColumnFamily(ColumnFamilyOptions(), "pikachu", &cf));
delete cf;
delete db2_init;
DB* db2 = nullptr;
std::vector<ColumnFamilyDescriptor> column_families;
ColumnFamilyOptions cf_options;
cf_options.merge_operator = MergeOperators::CreatePutOperator();
column_families.push_back(ColumnFamilyDescriptor("default", cf_options));
column_families.push_back(
ColumnFamilyDescriptor("pikachu", ColumnFamilyOptions()));
std::vector<ColumnFamilyHandle*> handles;
DBOptions db_opts;
db_opts.env = env_;
ASSERT_OK(DB::Open(db_opts, dbname2, column_families, &handles, &db2));
env_->SleepForMicroseconds(100);
// Verify that the keys don't already exist
ASSERT_TRUE(db2->Get(ro, handles[0], "a", &value).IsNotFound());
ASSERT_TRUE(db2->Get(ro, handles[0], "g", &value).IsNotFound());
std::unique_ptr<TraceReader> trace_reader;
ASSERT_OK(NewFileTraceReader(env_, env_opts, trace_filename, &trace_reader));
std::unique_ptr<Replayer> replayer;
ASSERT_OK(
db2->NewDefaultReplayer(handles, std::move(trace_reader), &replayer));
// Manual replay for 2 times. The 2nd checks if the replay can restart.
std::unique_ptr<TraceRecord> record;
for (int i = 0; i < 2; i++) {
// Next should fail if unprepared.
ASSERT_TRUE(replayer->Next(nullptr).IsIncomplete());
ASSERT_OK(replayer->Prepare());
Status s = Status::OK();
// Looping until trace end.
while (s.ok()) {
s = replayer->Next(&record);
// Skip unsupported operations.
if (s.IsNotSupported()) {
continue;
}
if (s.ok()) {
ASSERT_OK(replayer->Execute(std::move(record)));
}
}
// Status::Incomplete() will be returned when manually reading the trace
// end, or Prepare() was not called.
ASSERT_TRUE(s.IsIncomplete());
ASSERT_TRUE(replayer->Next(nullptr).IsIncomplete());
}
ASSERT_OK(db2->Get(ro, handles[0], "a", &value));
ASSERT_EQ("1", value);
ASSERT_OK(db2->Get(ro, handles[0], "g", &value));
ASSERT_EQ("12", value);
ASSERT_TRUE(db2->Get(ro, handles[0], "hello", &value).IsNotFound());
ASSERT_TRUE(db2->Get(ro, handles[0], "world", &value).IsNotFound());
ASSERT_OK(db2->Get(ro, handles[1], "foo", &value));
ASSERT_EQ("bar", value);
ASSERT_OK(db2->Get(ro, handles[1], "rocksdb", &value));
ASSERT_EQ("rocks", value);
// Test execution of artificially created TraceRecords.
uint64_t fake_ts = 1U;
// Write
batch.Clear();
batch.Put("trace-record-write1", "write1");
batch.Put("trace-record-write2", "write2");
record.reset(new WriteQueryTraceRecord(batch.Data(), fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
ASSERT_OK(db2->Get(ro, handles[0], "trace-record-write1", &value));
ASSERT_EQ("write1", value);
ASSERT_OK(db2->Get(ro, handles[0], "trace-record-write2", &value));
ASSERT_EQ("write2", value);
// Get related
// Get an existing key.
record.reset(new GetQueryTraceRecord(handles[0]->GetID(),
"trace-record-write1", fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
// Get an non-existing key, should still return Status::OK().
record.reset(new GetQueryTraceRecord(handles[0]->GetID(), "trace-record-get",
fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
// Get from an invalid (non-existing) cf_id.
uint32_t invalid_cf_id = handles[1]->GetID() + 1;
record.reset(new GetQueryTraceRecord(invalid_cf_id, "whatever", fake_ts++));
ASSERT_TRUE(replayer->Execute(std::move(record)).IsCorruption());
// Iteration related
for (IteratorSeekQueryTraceRecord::SeekType seekType :
{IteratorSeekQueryTraceRecord::kSeek,
IteratorSeekQueryTraceRecord::kSeekForPrev}) {
// Seek to an existing key.
record.reset(new IteratorSeekQueryTraceRecord(
seekType, handles[0]->GetID(), "trace-record-write1", fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
// Seek to an non-existing key, should still return Status::OK().
record.reset(new IteratorSeekQueryTraceRecord(
seekType, handles[0]->GetID(), "trace-record-get", fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
// Seek from an invalid cf_id.
record.reset(new IteratorSeekQueryTraceRecord(seekType, invalid_cf_id,
"whatever", fake_ts++));
ASSERT_TRUE(replayer->Execute(std::move(record)).IsCorruption());
}
// MultiGet related
// Get existing keys.
record.reset(new MultiGetQueryTraceRecord(
std::vector<uint32_t>({handles[0]->GetID(), handles[1]->GetID()}),
std::vector<std::string>({"a", "foo"}), fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
// Get all non-existing keys, should still return Status::OK().
record.reset(new MultiGetQueryTraceRecord(
std::vector<uint32_t>({handles[0]->GetID(), handles[1]->GetID()}),
std::vector<std::string>({"no1", "no2"}), fake_ts++));
// Get mixed of existing and non-existing keys, should still return
// Status::OK().
record.reset(new MultiGetQueryTraceRecord(
std::vector<uint32_t>({handles[0]->GetID(), handles[1]->GetID()}),
std::vector<std::string>({"a", "no2"}), fake_ts++));
ASSERT_OK(replayer->Execute(std::move(record)));
// Get from an invalid (non-existing) cf_id.
record.reset(new MultiGetQueryTraceRecord(
std::vector<uint32_t>(
{handles[0]->GetID(), handles[1]->GetID(), invalid_cf_id}),
std::vector<std::string>({"a", "foo", "whatever"}), fake_ts++));
ASSERT_TRUE(replayer->Execute(std::move(record)).IsCorruption());
// Empty MultiGet
record.reset(new MultiGetQueryTraceRecord(
std::vector<uint32_t>(), std::vector<std::string>(), fake_ts++));
ASSERT_TRUE(replayer->Execute(std::move(record)).IsInvalidArgument());
// MultiGet size mismatch
record.reset(new MultiGetQueryTraceRecord(
std::vector<uint32_t>({handles[0]->GetID(), handles[1]->GetID()}),
std::vector<std::string>({"a"}), fake_ts++));
ASSERT_TRUE(replayer->Execute(std::move(record)).IsInvalidArgument());
replayer.reset();
for (auto handle : handles) {
delete handle;
}
@ -4334,8 +4566,12 @@ TEST_F(DBTest2, TraceWithLimit) {
std::unique_ptr<TraceReader> trace_reader;
ASSERT_OK(NewFileTraceReader(env_, env_opts, trace_filename, &trace_reader));
Replayer replayer(db2, handles_, std::move(trace_reader));
ASSERT_OK(replayer.Replay());
std::unique_ptr<Replayer> replayer;
ASSERT_OK(
db2->NewDefaultReplayer(handles, std::move(trace_reader), &replayer));
ASSERT_OK(replayer->Prepare());
ASSERT_OK(replayer->Replay());
replayer.reset();
ASSERT_TRUE(db2->Get(ro, handles[0], "a", &value).IsNotFound());
ASSERT_TRUE(db2->Get(ro, handles[0], "b", &value).IsNotFound());
@ -4405,8 +4641,12 @@ TEST_F(DBTest2, TraceWithSampling) {
std::unique_ptr<TraceReader> trace_reader;
ASSERT_OK(NewFileTraceReader(env_, env_opts, trace_filename, &trace_reader));
Replayer replayer(db2, handles_, std::move(trace_reader));
ASSERT_OK(replayer.Replay());
std::unique_ptr<Replayer> replayer;
ASSERT_OK(
db2->NewDefaultReplayer(handles, std::move(trace_reader), &replayer));
ASSERT_OK(replayer->Prepare());
ASSERT_OK(replayer->Replay());
replayer.reset();
ASSERT_TRUE(db2->Get(ro, handles[0], "a", &value).IsNotFound());
ASSERT_FALSE(db2->Get(ro, handles[0], "b", &value).IsNotFound());
@ -4505,8 +4745,12 @@ TEST_F(DBTest2, TraceWithFilter) {
std::unique_ptr<TraceReader> trace_reader;
ASSERT_OK(NewFileTraceReader(env_, env_opts, trace_filename, &trace_reader));
Replayer replayer(db2, handles_, std::move(trace_reader));
ASSERT_OK(replayer.Replay());
std::unique_ptr<Replayer> replayer;
ASSERT_OK(
db2->NewDefaultReplayer(handles, std::move(trace_reader), &replayer));
ASSERT_OK(replayer->Prepare());
ASSERT_OK(replayer->Replay());
replayer.reset();
// All the key-values should not present since we filter out the WRITE ops.
ASSERT_TRUE(db2->Get(ro, handles[0], "a", &value).IsNotFound());

1
env/file_system_tracer.cc vendored
View File

@ -7,6 +7,7 @@
#include "rocksdb/file_system.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/trace_record.h"
namespace ROCKSDB_NAMESPACE {

38
include/rocksdb/db.h
View File

@ -39,25 +39,31 @@
namespace ROCKSDB_NAMESPACE {
struct Options;
struct DBOptions;
struct ColumnFamilyOptions;
struct ReadOptions;
struct WriteOptions;
struct FlushOptions;
struct CompactionOptions;
struct CompactRangeOptions;
struct TableProperties;
struct DBOptions;
struct ExternalSstFileInfo;
class WriteBatch;
class Env;
class EventListener;
class StatsHistoryIterator;
class TraceWriter;
struct FlushOptions;
struct Options;
struct ReadOptions;
struct TableProperties;
struct WriteOptions;
#ifdef ROCKSDB_LITE
class CompactionJobInfo;
#endif
class Env;
class EventListener;
class FileSystem;
#ifndef ROCKSDB_LITE
class Replayer;
#endif
class StatsHistoryIterator;
#ifndef ROCKSDB_LITE
class TraceReader;
class TraceWriter;
#endif
class WriteBatch;
extern const std::string kDefaultColumnFamilyName;
extern const std::string kPersistentStatsColumnFamilyName;
@ -1628,6 +1634,7 @@ class DB {
virtual ColumnFamilyHandle* DefaultColumnFamily() const = 0;
#ifndef ROCKSDB_LITE
virtual Status GetPropertiesOfAllTables(ColumnFamilyHandle* column_family,
TablePropertiesCollection* props) = 0;
virtual Status GetPropertiesOfAllTables(TablePropertiesCollection* props) {
@ -1678,6 +1685,15 @@ class DB {
virtual Status EndBlockCacheTrace() {
return Status::NotSupported("EndBlockCacheTrace() is not implemented.");
}
// Create a default trace replayer.
virtual Status NewDefaultReplayer(
const std::vector<ColumnFamilyHandle*>& /*handles*/,
std::unique_ptr<TraceReader>&& /*reader*/,
std::unique_ptr<Replayer>* /*replayer*/) {
return Status::NotSupported("NewDefaultReplayer() is not implemented.");
}
#endif // ROCKSDB_LITE
// Needed for StackableDB

6
include/rocksdb/trace_reader_writer.h
View File

@ -36,6 +36,11 @@ class TraceReader {
virtual Status Read(std::string* data) = 0;
virtual Status Close() = 0;
// Seek back to the trace header. Replayer can call this method for
// repeatedly replaying. Note this method may fail if the reader is already
// closed.
virtual Status Reset() = 0;
};
// Factory methods to read/write traces from/to a file.
@ -45,4 +50,5 @@ Status NewFileTraceWriter(Env* env, const EnvOptions& env_options,
Status NewFileTraceReader(Env* env, const EnvOptions& env_options,
const std::string& trace_filename,
std::unique_ptr<TraceReader>* trace_reader);
} // namespace ROCKSDB_NAMESPACE

205
include/rocksdb/trace_record.h Normal file
View File

@ -0,0 +1,205 @@
// 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 <string>
#include <vector>
#include "rocksdb/rocksdb_namespace.h"
#include "rocksdb/slice.h"
namespace ROCKSDB_NAMESPACE {
class ColumnFamilyHandle;
class DB;
class Status;
// Supported trace record types.
enum TraceType : char {
kTraceNone = 0,
kTraceBegin = 1,
kTraceEnd = 2,
// Query level tracing related trace types.
kTraceWrite = 3,
kTraceGet = 4,
kTraceIteratorSeek = 5,
kTraceIteratorSeekForPrev = 6,
// Block cache tracing related trace types.
kBlockTraceIndexBlock = 7,
kBlockTraceFilterBlock = 8,
kBlockTraceDataBlock = 9,
kBlockTraceUncompressionDictBlock = 10,
kBlockTraceRangeDeletionBlock = 11,
// IO tracing related trace type.
kIOTracer = 12,
// Query level tracing related trace type.
kTraceMultiGet = 13,
// All trace types should be added before kTraceMax
kTraceMax,
};
class WriteQueryTraceRecord;
class GetQueryTraceRecord;
class IteratorSeekQueryTraceRecord;
class MultiGetQueryTraceRecord;
// Base class for all types of trace records.
class TraceRecord {
public:
TraceRecord();
explicit TraceRecord(uint64_t timestamp);
virtual ~TraceRecord();
virtual TraceType GetTraceType() const = 0;
virtual uint64_t GetTimestamp() const;
class Handler {
public:
virtual ~Handler() {}
virtual Status Handle(const WriteQueryTraceRecord& record) = 0;
virtual Status Handle(const GetQueryTraceRecord& record) = 0;
virtual Status Handle(const IteratorSeekQueryTraceRecord& record) = 0;
virtual Status Handle(const MultiGetQueryTraceRecord& record) = 0;
};
virtual Status Accept(Handler* handler) = 0;
// Create a handler for the exeution of TraceRecord.
static Handler* NewExecutionHandler(
DB* db, const std::vector<ColumnFamilyHandle*>& handles);
private:
// Timestamp (in microseconds) of this trace.
uint64_t timestamp_;
};
// Base class for all query types of trace records.
class QueryTraceRecord : public TraceRecord {
public:
explicit QueryTraceRecord(uint64_t timestamp);
virtual ~QueryTraceRecord() override;
};
// Trace record for DB::Write() operation.
class WriteQueryTraceRecord : public QueryTraceRecord {
public:
WriteQueryTraceRecord(PinnableSlice&& write_batch_rep, uint64_t timestamp);
WriteQueryTraceRecord(const std::string& write_batch_rep, uint64_t timestamp);
virtual ~WriteQueryTraceRecord() override;
TraceType GetTraceType() const override { return kTraceWrite; };
virtual Slice GetWriteBatchRep() const;
virtual Status Accept(Handler* handler) override;
private:
PinnableSlice rep_;
};
// Trace record for DB::Get() operation
class GetQueryTraceRecord : public QueryTraceRecord {
public:
GetQueryTraceRecord(uint32_t column_family_id, PinnableSlice&& key,
uint64_t timestamp);
GetQueryTraceRecord(uint32_t column_family_id, const std::string& key,
uint64_t timestamp);
virtual ~GetQueryTraceRecord() override;
TraceType GetTraceType() const override { return kTraceGet; };
virtual uint32_t GetColumnFamilyID() const;
virtual Slice GetKey() const;
virtual Status Accept(Handler* handler) override;
private:
// Column family ID.
uint32_t cf_id_;
// Key to get.
PinnableSlice key_;
};
// Base class for all Iterator related operations.
class IteratorQueryTraceRecord : public QueryTraceRecord {
public:
explicit IteratorQueryTraceRecord(uint64_t timestamp);
virtual ~IteratorQueryTraceRecord() override;
};
// Trace record for Iterator::Seek() and Iterator::SeekForPrev() operation.
class IteratorSeekQueryTraceRecord : public IteratorQueryTraceRecord {
public:
// Currently we only support Seek() and SeekForPrev().
enum SeekType {
kSeek = kTraceIteratorSeek,
kSeekForPrev = kTraceIteratorSeekForPrev
};
IteratorSeekQueryTraceRecord(SeekType seekType, uint32_t column_family_id,
PinnableSlice&& key, uint64_t timestamp);
IteratorSeekQueryTraceRecord(SeekType seekType, uint32_t column_family_id,
const std::string& key, uint64_t timestamp);
virtual ~IteratorSeekQueryTraceRecord() override;
TraceType GetTraceType() const override;
virtual SeekType GetSeekType() const;
virtual uint32_t GetColumnFamilyID() const;
virtual Slice GetKey() const;
virtual Status Accept(Handler* handler) override;
private:
SeekType type_;
// Column family ID.
uint32_t cf_id_;
// Key to seek to.
PinnableSlice key_;
};
// Trace record for DB::MultiGet() operation.
class MultiGetQueryTraceRecord : public QueryTraceRecord {
public:
MultiGetQueryTraceRecord(std::vector<uint32_t> column_family_ids,
std::vector<PinnableSlice>&& keys,
uint64_t timestamp);
MultiGetQueryTraceRecord(std::vector<uint32_t> column_family_ids,
const std::vector<std::string>& keys,
uint64_t timestamp);
virtual ~MultiGetQueryTraceRecord() override;
TraceType GetTraceType() const override { return kTraceMultiGet; };
virtual std::vector<uint32_t> GetColumnFamilyIDs() const;
virtual std::vector<Slice> GetKeys() const;
virtual Status Accept(Handler* handler) override;
private:
// Column familiy IDs.
std::vector<uint32_t> cf_ids_;
// Keys to get.
std::vector<PinnableSlice> keys_;
};
} // namespace ROCKSDB_NAMESPACE

74
include/rocksdb/utilities/replayer.h Normal file
View File

@ -0,0 +1,74 @@
// 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
#ifndef ROCKSDB_LITE
#include <memory>
#include "rocksdb/rocksdb_namespace.h"
#include "rocksdb/status.h"
#include "rocksdb/trace_record.h"
namespace ROCKSDB_NAMESPACE {
struct ReplayOptions {
// Number of threads used for replaying. If 0 or 1, replay using
// single thread.
uint32_t num_threads;
// Enables fast forwarding a replay by increasing/reducing the delay between
// the ingested traces.
// If > 0.0 and < 1.0, slow down the replay by this amount.
// If 1.0, replay the operations at the same rate as in the trace stream.
// If > 1, speed up the replay by this amount.
double fast_forward;
ReplayOptions() : num_threads(1), fast_forward(1.0) {}
ReplayOptions(uint32_t num_of_threads, double fast_forward_ratio)
: num_threads(num_of_threads), fast_forward(fast_forward_ratio) {}
};
// Replayer helps to replay the captured RocksDB query level operations.
// The Replayer can either be created from DB::NewReplayer method, or be
// instantiated via db_bench today, on using "replay" benchmark.
class Replayer {
public:
virtual ~Replayer() {}
// Make some preparation before replaying the trace. This will also reset the
// replayer in order to restart replaying.
virtual Status Prepare() = 0;
// Return the timestamp when the trace recording was started.
virtual uint64_t GetHeaderTimestamp() const = 0;
// Atomically read one trace into a TraceRecord (excluding the header and
// footer traces).
// Return Status::OK() on success;
// Status::Incomplete() if Prepare() was not called or no more available
// trace;
// Status::NotSupported() if the read trace type is not supported.
virtual Status Next(std::unique_ptr<TraceRecord>* record) = 0;
// Execute one TraceRecord.
// Return Status::OK() if the execution was successful. Get/MultiGet traces
// will still return Status::OK() even if they got Status::NotFound()
// from DB::Get() or DB::MultiGet();
// Status::Incomplete() if Prepare() was not called or no more available
// trace;
// Status::NotSupported() if the operation is not supported;
// Otherwise, return the corresponding error status.
virtual Status Execute(const std::unique_ptr<TraceRecord>& record) = 0;
virtual Status Execute(std::unique_ptr<TraceRecord>&& record) = 0;
// Replay all the traces from the provided trace stream, taking the delay
// between the traces into consideration.
virtual Status Replay(const ReplayOptions& options) = 0;
virtual Status Replay() { return Replay(ReplayOptions()); }
};
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE

7
include/rocksdb/utilities/stackable_db.h
View File

@ -390,6 +390,13 @@ class StackableDB : public DB {
using DB::EndTrace;
Status EndTrace() override { return db_->EndTrace(); }
using DB::NewDefaultReplayer;
Status NewDefaultReplayer(const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader,
std::unique_ptr<Replayer>* replayer) override {
return db_->NewDefaultReplayer(handles, std::move(reader), replayer);
}
#endif // ROCKSDB_LITE
virtual Status GetLiveFiles(std::vector<std::string>& vec, uint64_t* mfs,

3
src.mk
View File

@ -198,6 +198,8 @@ LIB_SOURCES = \
test_util/sync_point_impl.cc \
test_util/transaction_test_util.cc \
tools/dump/db_dump_tool.cc \
trace_replay/trace_record_handler.cc \
trace_replay/trace_record.cc \
trace_replay/trace_replay.cc \
trace_replay/block_cache_tracer.cc \
trace_replay/io_tracer.cc \
@ -262,6 +264,7 @@ LIB_SOURCES = \
utilities/simulator_cache/sim_cache.cc \
utilities/table_properties_collectors/compact_on_deletion_collector.cc \
utilities/trace/file_trace_reader_writer.cc \
utilities/trace/replayer_impl.cc \
utilities/transactions/lock/lock_manager.cc \
utilities/transactions/lock/point/point_lock_tracker.cc \
utilities/transactions/lock/point/point_lock_manager.cc \

1
table/block_based/block_based_table_reader.cc
View File

@ -36,6 +36,7 @@
#include "rocksdb/system_clock.h"
#include "rocksdb/table.h"
#include "rocksdb/table_properties.h"
#include "rocksdb/trace_record.h"
#include "table/block_based/binary_search_index_reader.h"
#include "table/block_based/block.h"
#include "table/block_based/block_based_filter_block.h"

2
table/table_test.cc
View File

@ -8,6 +8,7 @@
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <map>
@ -34,6 +35,7 @@
#include "rocksdb/perf_context.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/statistics.h"
#include "rocksdb/trace_record.h"
#include "rocksdb/write_buffer_manager.h"
#include "table/block_based/block.h"
#include "table/block_based/block_based_table_builder.h"

1
tools/block_cache_analyzer/block_cache_trace_analyzer.cc
View File

@ -20,6 +20,7 @@
#include "monitoring/histogram.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/trace_record.h"
#include "util/gflags_compat.h"
#include "util/string_util.h"

1
tools/block_cache_analyzer/block_cache_trace_analyzer.h
View File

@ -11,6 +11,7 @@
#include "db/dbformat.h"
#include "rocksdb/env.h"
#include "rocksdb/trace_record.h"
#include "rocksdb/utilities/sim_cache.h"
#include "trace_replay/block_cache_tracer.h"
#include "utilities/simulator_cache/cache_simulator.h"

1
tools/block_cache_analyzer/block_cache_trace_analyzer_test.cc
View File

@ -21,6 +21,7 @@ int main() {
#include "rocksdb/env.h"
#include "rocksdb/status.h"
#include "rocksdb/trace_reader_writer.h"
#include "rocksdb/trace_record.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "tools/block_cache_analyzer/block_cache_trace_analyzer.h"

53
tools/db_bench_tool.cc
View File

@ -63,6 +63,9 @@
#include "rocksdb/utilities/optimistic_transaction_db.h"
#include "rocksdb/utilities/options_type.h"
#include "rocksdb/utilities/options_util.h"
#ifndef ROCKSDB_LITE
#include "rocksdb/utilities/replayer.h"
#endif // ROCKSDB_LITE
#include "rocksdb/utilities/sim_cache.h"
#include "rocksdb/utilities/transaction.h"
#include "rocksdb/utilities/transaction_db.h"
@ -228,7 +231,9 @@ IF_ROCKSDB_LITE("",
"\tmemstats -- Print memtable stats\n"
"\tsstables -- Print sstable info\n"
"\theapprofile -- Dump a heap profile (if supported by this port)\n"
#ifndef ROCKSDB_LITE
"\treplay -- replay the trace file specified with trace_file\n"
#endif // ROCKSDB_LITE
"\tgetmergeoperands -- Insert lots of merge records which are a list of "
"sorted ints for a key and then compare performance of lookup for another "
"key "
@ -997,10 +1002,12 @@ DEFINE_bool(report_bg_io_stats, false,
DEFINE_bool(use_stderr_info_logger, false,
"Write info logs to stderr instead of to LOG file. ");
#ifndef ROCKSDB_LITE
DEFINE_string(trace_file, "", "Trace workload to a file. ");
DEFINE_int32(trace_replay_fast_forward, 1,
"Fast forward trace replay, must >= 1. ");
DEFINE_double(trace_replay_fast_forward, 1.0,
"Fast forward trace replay, must > 0.0.");
DEFINE_int32(block_cache_trace_sampling_frequency, 1,
"Block cache trace sampling frequency, termed s. It uses spatial "
"downsampling and samples accesses to one out of s blocks.");
@ -1014,6 +1021,8 @@ DEFINE_string(block_cache_trace_file, "", "Block cache trace file path.");
DEFINE_int32(trace_replay_threads, 1,
"The number of threads to replay, must >=1.");
#endif // ROCKSDB_LITE
static enum ROCKSDB_NAMESPACE::CompressionType StringToCompressionType(
const char* ctype) {
assert(ctype);
@ -3468,6 +3477,7 @@ class Benchmark {
PrintStats("rocksdb.sstables");
} else if (name == "stats_history") {
PrintStatsHistory();
#ifndef ROCKSDB_LITE
} else if (name == "replay") {
if (num_threads > 1) {
fprintf(stderr, "Multi-threaded replay is not yet supported\n");
@ -3478,6 +3488,7 @@ class Benchmark {
ErrorExit();
}
method = &Benchmark::Replay;
#endif // ROCKSDB_LITE
} else if (name == "getmergeoperands") {
method = &Benchmark::GetMergeOperands;
} else if (!name.empty()) { // No error message for empty name
@ -7978,6 +7989,8 @@ class Benchmark {
}
}
#ifndef ROCKSDB_LITE
void Replay(ThreadState* thread) {
if (db_.db != nullptr) {
Replay(thread, &db_);
@ -7997,20 +8010,34 @@ class Benchmark {
s.ToString().c_str());
exit(1);
}
Replayer replayer(db_with_cfh->db, db_with_cfh->cfh,
std::move(trace_reader));
replayer.SetFastForward(
static_cast<uint32_t>(FLAGS_trace_replay_fast_forward));
s = replayer.MultiThreadReplay(
static_cast<uint32_t>(FLAGS_trace_replay_threads));
if (s.ok()) {
fprintf(stdout, "Replay started from trace_file: %s\n",
FLAGS_trace_file.c_str());
} else {
fprintf(stderr, "Starting replay failed. Error: %s\n",
std::unique_ptr<Replayer> replayer;
s = db_with_cfh->db->NewDefaultReplayer(db_with_cfh->cfh,
std::move(trace_reader), &replayer);
if (!s.ok()) {
fprintf(stderr,
"Encountered an error creating a default Replayer. "
"Error: %s\n",
s.ToString().c_str());
exit(1);
}
s = replayer->Prepare();
if (!s.ok()) {
fprintf(stderr, "Prepare for replay failed. Error: %s\n",
s.ToString().c_str());
}
s = replayer->Replay(
ReplayOptions(static_cast<uint32_t>(FLAGS_trace_replay_threads),
FLAGS_trace_replay_fast_forward));
replayer.reset();
if (s.ok()) {
fprintf(stdout, "Replay completed from trace_file: %s\n",
FLAGS_trace_file.c_str());
} else {
fprintf(stderr, "Replay failed. Error: %s\n", s.ToString().c_str());
}
}
#endif // ROCKSDB_LITE
};
int db_bench_tool(int argc, char** argv) {

142
tools/trace_analyzer_tool.cc
View File

@ -195,12 +195,6 @@ uint64_t MultiplyCheckOverflow(uint64_t op1, uint64_t op2) {
return (op1 * op2);
}
void DecodeCFAndKeyFromString(std::string& buffer, uint32_t* cf_id, Slice* key) {
Slice buf(buffer);
GetFixed32(&buf, cf_id);
GetLengthPrefixedSlice(&buf, key);
}
} // namespace
// The default constructor of AnalyzerOptions
@ -477,25 +471,29 @@ Status TraceAnalyzer::StartProcessing() {
total_requests_++;
end_time_ = trace.ts;
if (trace.type == kTraceWrite) {
if (trace.type == kTraceEnd) {
break;
}
std::unique_ptr<TraceRecord> record;
switch (trace.type) {
case kTraceWrite: {
s = TracerHelper::DecodeWriteRecord(&trace, trace_file_version_,
&record);
if (!s.ok()) {
return s;
}
total_writes_++;
c_time_ = trace.ts;
Slice batch_data;
if (trace_file_version_ < 2) {
Slice tmp_data(trace.payload);
batch_data = tmp_data;
} else {
WritePayload w_payload;
TracerHelper::DecodeWritePayload(&trace, &w_payload);
batch_data = w_payload.write_batch_data;
}
std::unique_ptr<WriteQueryTraceRecord> r(
reinterpret_cast<WriteQueryTraceRecord*>(record.release()));
// Note that, if the write happens in a transaction,
// 'Write' will be called twice, one for Prepare, one for
// Commit. Thus, in the trace, for the same WriteBatch, there
// will be two reords if it is in a transaction. Here, we only
// process the reord that is committed. If write is non-transaction,
// HasBeginPrepare()==false, so we process it normally.
WriteBatch batch(batch_data.ToString());
WriteBatch batch(r->GetWriteBatchRep().ToString());
if (batch.HasBeginPrepare() && !batch.HasCommit()) {
continue;
}
@ -505,47 +503,58 @@ Status TraceAnalyzer::StartProcessing() {
fprintf(stderr, "Cannot process the write batch in the trace\n");
return s;
}
} else if (trace.type == kTraceGet) {
GetPayload get_payload;
get_payload.get_key = 0;
if (trace_file_version_ < 2) {
DecodeCFAndKeyFromString(trace.payload, &get_payload.cf_id,
&get_payload.get_key);
} else {
TracerHelper::DecodeGetPayload(&trace, &get_payload);
break;
}
case kTraceGet: {
s = TracerHelper::DecodeGetRecord(&trace, trace_file_version_, &record);
if (!s.ok()) {
return s;
}
total_gets_++;
s = HandleGet(get_payload.cf_id, get_payload.get_key.ToString(), trace.ts,
std::unique_ptr<GetQueryTraceRecord> r(
reinterpret_cast<GetQueryTraceRecord*>(record.release()));
s = HandleGet(r->GetColumnFamilyID(), r->GetKey(), r->GetTimestamp(),
1);
if (!s.ok()) {
fprintf(stderr, "Cannot process the get in the trace\n");
return s;
}
} else if (trace.type == kTraceIteratorSeek ||
trace.type == kTraceIteratorSeekForPrev) {
IterPayload iter_payload;
iter_payload.cf_id = 0;
if (trace_file_version_ < 2) {
DecodeCFAndKeyFromString(trace.payload, &iter_payload.cf_id,
&iter_payload.iter_key);
} else {
TracerHelper::DecodeIterPayload(&trace, &iter_payload);
break;
}
s = HandleIter(iter_payload.cf_id, iter_payload.iter_key.ToString(),
trace.ts, trace.type);
case kTraceIteratorSeek:
case kTraceIteratorSeekForPrev: {
s = TracerHelper::DecodeIterRecord(&trace, trace_file_version_,
&record);
if (!s.ok()) {
return s;
}
std::unique_ptr<IteratorSeekQueryTraceRecord> r(
reinterpret_cast<IteratorSeekQueryTraceRecord*>(record.release()));
s = HandleIter(r->GetColumnFamilyID(), r->GetKey(), r->GetTimestamp(),
r->GetTraceType());
if (!s.ok()) {
fprintf(stderr, "Cannot process the iterator in the trace\n");
return s;
}
} else if (trace.type == kTraceMultiGet) {
MultiGetPayload multiget_payload;
assert(trace_file_version_ >= 2);
TracerHelper::DecodeMultiGetPayload(&trace, &multiget_payload);
s = HandleMultiGet(multiget_payload, trace.ts);
} else if (trace.type == kTraceEnd) {
break;
}
case kTraceMultiGet: {
s = TracerHelper::DecodeMultiGetRecord(&trace, trace_file_version_,
&record);
if (!s.ok()) {
return s;
}
std::unique_ptr<MultiGetQueryTraceRecord> r(
reinterpret_cast<MultiGetQueryTraceRecord*>(record.release()));
s = HandleMultiGet(r->GetColumnFamilyIDs(), r->GetKeys(),
r->GetTimestamp());
break;
}
default: {
// Skip unsupported types
break;
}
}
}
if (s.IsIncomplete()) {
// Fix it: Reaching eof returns Incomplete status at the moment.
@ -1547,9 +1556,8 @@ Status TraceAnalyzer::CloseOutputFiles() {
}
// Handle the Get request in the trace
Status TraceAnalyzer::HandleGet(uint32_t column_family_id,
const std::string& key, const uint64_t& ts,
const uint32_t& get_ret) {
Status TraceAnalyzer::HandleGet(uint32_t column_family_id, const Slice& key,
const uint64_t& ts, const uint32_t& get_ret) {
Status s;
size_t value_size = 0;
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
@ -1575,8 +1583,8 @@ Status TraceAnalyzer::HandleGet(uint32_t column_family_id,
if (get_ret == 1) {
value_size = 10;
}
s = KeyStatsInsertion(TraceOperationType::kGet, column_family_id, key,
value_size, ts);
s = KeyStatsInsertion(TraceOperationType::kGet, column_family_id,
key.ToString(), value_size, ts);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
@ -1752,9 +1760,8 @@ Status TraceAnalyzer::HandleMerge(uint32_t column_family_id, const Slice& key,
}
// Handle the Iterator request in the trace
Status TraceAnalyzer::HandleIter(uint32_t column_family_id,
const std::string& key, const uint64_t& ts,
TraceType& trace_type) {
Status TraceAnalyzer::HandleIter(uint32_t column_family_id, const Slice& key,
const uint64_t& ts, TraceType trace_type) {
Status s;
size_t value_size = 0;
int type = -1;
@ -1788,7 +1795,7 @@ Status TraceAnalyzer::HandleIter(uint32_t column_family_id,
if (!ta_[type].enabled) {
return Status::OK();
}
s = KeyStatsInsertion(type, column_family_id, key, value_size, ts);
s = KeyStatsInsertion(type, column_family_id, key.ToString(), value_size, ts);
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
}
@ -1796,24 +1803,22 @@ Status TraceAnalyzer::HandleIter(uint32_t column_family_id,
}
// Handle MultiGet queries in the trace
Status TraceAnalyzer::HandleMultiGet(MultiGetPayload& multiget_payload,
const uint64_t& ts) {
Status TraceAnalyzer::HandleMultiGet(
const std::vector<uint32_t>& column_family_ids,
const std::vector<Slice>& keys, const uint64_t& ts) {
Status s;
size_t value_size = 0;
if (multiget_payload.cf_ids.size() != multiget_payload.multiget_keys.size()) {
if (column_family_ids.size() != keys.size()) {
// The size does not match is not the error of tracing and anayzing, we just
// report it to the user. The analyzing continues.
printf("The CF ID vector size does not match the keys vector size!\n");
}
size_t vector_size = std::min(multiget_payload.cf_ids.size(),
multiget_payload.multiget_keys.size());
size_t vector_size = std::min(column_family_ids.size(), keys.size());
if (FLAGS_convert_to_human_readable_trace && trace_sequence_f_) {
for (size_t i = 0; i < vector_size; i++) {
assert(i < multiget_payload.cf_ids.size() &&
i < multiget_payload.multiget_keys.size());
assert(i < column_family_ids.size() && i < keys.size());
s = WriteTraceSequence(TraceOperationType::kMultiGet,
multiget_payload.cf_ids[i],
multiget_payload.multiget_keys[i], value_size, ts);
column_family_ids[i], keys[i], value_size, ts);
}
if (!s.ok()) {
return Status::Corruption("Failed to write the trace sequence to file");
@ -1833,11 +1838,9 @@ Status TraceAnalyzer::HandleMultiGet(MultiGetPayload& multiget_payload,
return Status::OK();
}
for (size_t i = 0; i < vector_size; i++) {
assert(i < multiget_payload.cf_ids.size() &&
i < multiget_payload.multiget_keys.size());
s = KeyStatsInsertion(TraceOperationType::kMultiGet,
multiget_payload.cf_ids[i],
multiget_payload.multiget_keys[i], value_size, ts);
assert(i < column_family_ids.size() && i < keys.size());
s = KeyStatsInsertion(TraceOperationType::kMultiGet, column_family_ids[i],
keys[i].ToString(), value_size, ts);
}
if (!s.ok()) {
return Status::Corruption("Failed to insert key statistics");
@ -2011,10 +2014,11 @@ void TraceAnalyzer::PrintStatistics() {
// Write the trace sequence to file
Status TraceAnalyzer::WriteTraceSequence(const uint32_t& type,
const uint32_t& cf_id,
const std::string& key,
const Slice& key,
const size_t value_size,
const uint64_t ts) {
std::string hex_key = ROCKSDB_NAMESPACE::LDBCommand::StringToHex(key);
std::string hex_key =
ROCKSDB_NAMESPACE::LDBCommand::StringToHex(key.ToString());
int ret;
ret = snprintf(buffer_, sizeof(buffer_), "%u %u %zu %" PRIu64 "\n", type,
cf_id, value_size, ts);

12
tools/trace_analyzer_tool.h
View File

@ -15,6 +15,7 @@
#include "rocksdb/env.h"
#include "rocksdb/trace_reader_writer.h"
#include "rocksdb/trace_record.h"
#include "rocksdb/write_batch.h"
#include "trace_replay/trace_replay.h"
@ -182,7 +183,7 @@ class TraceAnalyzer {
Status WriteTraceUnit(TraceUnit& unit);
// The trace processing functions for different type
Status HandleGet(uint32_t column_family_id, const std::string& key,
Status HandleGet(uint32_t column_family_id, const Slice& key,
const uint64_t& ts, const uint32_t& get_ret);
Status HandlePut(uint32_t column_family_id, const Slice& key,
const Slice& value);
@ -192,9 +193,10 @@ class TraceAnalyzer {
const Slice& end_key);
Status HandleMerge(uint32_t column_family_id, const Slice& key,
const Slice& value);
Status HandleIter(uint32_t column_family_id, const std::string& key,
const uint64_t& ts, TraceType& trace_type);
Status HandleMultiGet(MultiGetPayload& multiget_payload, const uint64_t& ts);
Status HandleIter(uint32_t column_family_id, const Slice& key,
const uint64_t& ts, TraceType trace_type);
Status HandleMultiGet(const std::vector<uint32_t>& column_family_ids,
const std::vector<Slice>& keys, const uint64_t& ts);
std::vector<TypeUnit>& GetTaVector() { return ta_; }
private:
@ -246,7 +248,7 @@ class TraceAnalyzer {
Status TraceUnitWriter(
std::unique_ptr<ROCKSDB_NAMESPACE::WritableFile>& f_ptr, TraceUnit& unit);
Status WriteTraceSequence(const uint32_t& type, const uint32_t& cf_id,
const std::string& key, const size_t value_size,
const Slice& key, const size_t value_size,
const uint64_t ts);
Status MakeStatisticKeyStatsOrPrefix(TraceStats& stats);
Status MakeStatisticCorrelation(TraceStats& stats, StatsUnit& unit);

1
trace_replay/block_cache_tracer.cc
View File

@ -12,6 +12,7 @@
#include "db/db_impl/db_impl.h"
#include "db/dbformat.h"
#include "rocksdb/slice.h"
#include "rocksdb/trace_record.h"
#include "util/coding.h"
#include "util/hash.h"
#include "util/string_util.h"

2
trace_replay/block_cache_tracer_test.cc
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@ -4,9 +4,11 @@
// (found in the LICENSE.Apache file in the root directory).
#include "trace_replay/block_cache_tracer.h"
#include "rocksdb/env.h"
#include "rocksdb/status.h"
#include "rocksdb/trace_reader_writer.h"
#include "rocksdb/trace_record.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"

1
trace_replay/io_tracer.h
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@ -12,6 +12,7 @@
#include "port/lang.h"
#include "rocksdb/file_system.h"
#include "rocksdb/options.h"
#include "rocksdb/trace_record.h"
#include "trace_replay/trace_replay.h"
namespace ROCKSDB_NAMESPACE {

1
trace_replay/io_tracer_test.cc
View File

@ -8,6 +8,7 @@
#include "rocksdb/env.h"
#include "rocksdb/status.h"
#include "rocksdb/trace_reader_writer.h"
#include "rocksdb/trace_record.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"

163
trace_replay/trace_record.cc Normal file
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@ -0,0 +1,163 @@
// 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).
#include "rocksdb/trace_record.h"
#include <utility>
#include "rocksdb/db.h"
#include "rocksdb/iterator.h"
#include "rocksdb/options.h"
#include "rocksdb/status.h"
#include "trace_replay/trace_record_handler.h"
namespace ROCKSDB_NAMESPACE {
// TraceRecord
TraceRecord::TraceRecord(uint64_t timestamp) : timestamp_(timestamp) {}
TraceRecord::~TraceRecord() {}
uint64_t TraceRecord::GetTimestamp() const { return timestamp_; }
TraceRecord::Handler* TraceRecord::NewExecutionHandler(
DB* db, const std::vector<ColumnFamilyHandle*>& handles) {
return new TraceExecutionHandler(db, handles);
}
// QueryTraceRecord
QueryTraceRecord::QueryTraceRecord(uint64_t timestamp)
: TraceRecord(timestamp) {}
QueryTraceRecord::~QueryTraceRecord() {}
// WriteQueryTraceRecord
WriteQueryTraceRecord::WriteQueryTraceRecord(PinnableSlice&& write_batch_rep,
uint64_t timestamp)
: QueryTraceRecord(timestamp), rep_(std::move(write_batch_rep)) {}
WriteQueryTraceRecord::WriteQueryTraceRecord(const std::string& write_batch_rep,
uint64_t timestamp)
: QueryTraceRecord(timestamp) {
rep_.PinSelf(write_batch_rep);
}
WriteQueryTraceRecord::~WriteQueryTraceRecord() {}
Slice WriteQueryTraceRecord::GetWriteBatchRep() const { return Slice(rep_); }
Status WriteQueryTraceRecord::Accept(Handler* handler) {
assert(handler != nullptr);
return handler->Handle(*this);
}
// GetQueryTraceRecord
GetQueryTraceRecord::GetQueryTraceRecord(uint32_t column_family_id,
PinnableSlice&& key,
uint64_t timestamp)
: QueryTraceRecord(timestamp),
cf_id_(column_family_id),
key_(std::move(key)) {}
GetQueryTraceRecord::GetQueryTraceRecord(uint32_t column_family_id,
const std::string& key,
uint64_t timestamp)
: QueryTraceRecord(timestamp), cf_id_(column_family_id) {
key_.PinSelf(key);
}
GetQueryTraceRecord::~GetQueryTraceRecord() {}
uint32_t GetQueryTraceRecord::GetColumnFamilyID() const { return cf_id_; }
Slice GetQueryTraceRecord::GetKey() const { return Slice(key_); }
Status GetQueryTraceRecord::Accept(Handler* handler) {
assert(handler != nullptr);
return handler->Handle(*this);
}
// IteratorQueryTraceRecord
IteratorQueryTraceRecord::IteratorQueryTraceRecord(uint64_t timestamp)
: QueryTraceRecord(timestamp) {}
IteratorQueryTraceRecord::~IteratorQueryTraceRecord() {}
// IteratorSeekQueryTraceRecord
IteratorSeekQueryTraceRecord::IteratorSeekQueryTraceRecord(
SeekType seek_type, uint32_t column_family_id, PinnableSlice&& key,
uint64_t timestamp)
: IteratorQueryTraceRecord(timestamp),
type_(seek_type),
cf_id_(column_family_id),
key_(std::move(key)) {}
IteratorSeekQueryTraceRecord::IteratorSeekQueryTraceRecord(
SeekType seek_type, uint32_t column_family_id, const std::string& key,
uint64_t timestamp)
: IteratorQueryTraceRecord(timestamp),
type_(seek_type),
cf_id_(column_family_id) {
key_.PinSelf(key);
}
IteratorSeekQueryTraceRecord::~IteratorSeekQueryTraceRecord() {}
TraceType IteratorSeekQueryTraceRecord::GetTraceType() const {
return static_cast<TraceType>(type_);
}
IteratorSeekQueryTraceRecord::SeekType
IteratorSeekQueryTraceRecord::GetSeekType() const {
return type_;
}
uint32_t IteratorSeekQueryTraceRecord::GetColumnFamilyID() const {
return cf_id_;
}
Slice IteratorSeekQueryTraceRecord::GetKey() const { return Slice(key_); }
Status IteratorSeekQueryTraceRecord::Accept(Handler* handler) {
assert(handler != nullptr);
return handler->Handle(*this);
}
// MultiGetQueryTraceRecord
MultiGetQueryTraceRecord::MultiGetQueryTraceRecord(
std::vector<uint32_t> column_family_ids, std::vector<PinnableSlice>&& keys,
uint64_t timestamp)
: QueryTraceRecord(timestamp),
cf_ids_(column_family_ids),
keys_(std::move(keys)) {}
MultiGetQueryTraceRecord::MultiGetQueryTraceRecord(
std::vector<uint32_t> column_family_ids,
const std::vector<std::string>& keys, uint64_t timestamp)
: QueryTraceRecord(timestamp), cf_ids_(column_family_ids) {
keys_.reserve(keys.size());
for (const std::string& key : keys) {
PinnableSlice ps;
ps.PinSelf(key);
keys_.push_back(std::move(ps));
}
}
MultiGetQueryTraceRecord::~MultiGetQueryTraceRecord() {}
std::vector<uint32_t> MultiGetQueryTraceRecord::GetColumnFamilyIDs() const {
return cf_ids_;
}
std::vector<Slice> MultiGetQueryTraceRecord::GetKeys() const {
return std::vector<Slice>(keys_.begin(), keys_.end());
}
Status MultiGetQueryTraceRecord::Accept(Handler* handler) {
assert(handler != nullptr);
return handler->Handle(*this);
}
} // namespace ROCKSDB_NAMESPACE

108
trace_replay/trace_record_handler.cc Normal file
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@ -0,0 +1,108 @@
// 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).
#include "trace_replay/trace_record_handler.h"
#include "rocksdb/iterator.h"
#include "rocksdb/write_batch.h"
namespace ROCKSDB_NAMESPACE {
// TraceExecutionHandler
TraceExecutionHandler::TraceExecutionHandler(
DB* db, const std::vector<ColumnFamilyHandle*>& handles)
: TraceRecord::Handler(),
db_(db),
write_opts_(WriteOptions()),
read_opts_(ReadOptions()) {
assert(db != nullptr);
assert(!handles.empty());
cf_map_.reserve(handles.size());
for (ColumnFamilyHandle* handle : handles) {
assert(handle != nullptr);
cf_map_.insert({handle->GetID(), handle});
}
}
TraceExecutionHandler::~TraceExecutionHandler() { cf_map_.clear(); }
Status TraceExecutionHandler::Handle(const WriteQueryTraceRecord& record) {
WriteBatch batch(record.GetWriteBatchRep().ToString());
return db_->Write(write_opts_, &batch);
}
Status TraceExecutionHandler::Handle(const GetQueryTraceRecord& record) {
auto it = cf_map_.find(record.GetColumnFamilyID());
if (it == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
assert(it->second != nullptr);
std::string value;
Status s = db_->Get(read_opts_, it->second, record.GetKey(), &value);
// Treat not found as ok and return other errors.
return s.IsNotFound() ? Status::OK() : s;
}
Status TraceExecutionHandler::Handle(
const IteratorSeekQueryTraceRecord& record) {
auto it = cf_map_.find(record.GetColumnFamilyID());
if (it == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
assert(it->second != nullptr);
Iterator* single_iter = db_->NewIterator(read_opts_, it->second);
switch (record.GetSeekType()) {
case IteratorSeekQueryTraceRecord::kSeekForPrev: {
single_iter->SeekForPrev(record.GetKey());
break;
}
default: {
single_iter->Seek(record.GetKey());
break;
}
}
Status s = single_iter->status();
delete single_iter;
return s;
}
Status TraceExecutionHandler::Handle(const MultiGetQueryTraceRecord& record) {
std::vector<ColumnFamilyHandle*> handles;
handles.reserve(record.GetColumnFamilyIDs().size());
for (uint32_t cf_id : record.GetColumnFamilyIDs()) {
auto it = cf_map_.find(cf_id);
if (it == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
assert(it->second != nullptr);
handles.push_back(it->second);
}
std::vector<Slice> keys = record.GetKeys();
if (handles.empty() || keys.empty()) {
return Status::InvalidArgument("Empty MultiGet cf_ids or keys.");
}
if (handles.size() != keys.size()) {
return Status::InvalidArgument("MultiGet cf_ids and keys size mismatch.");
}
std::vector<std::string> values;
std::vector<Status> ss = db_->MultiGet(read_opts_, handles, keys, &values);
// Treat not found as ok, return other errors.
for (Status s : ss) {
if (!s.ok() && !s.IsNotFound()) {
return s;
}
}
return Status::OK();
}
} // namespace ROCKSDB_NAMESPACE

39
trace_replay/trace_record_handler.h Normal file
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@ -0,0 +1,39 @@
// 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 <unordered_map>
#include <vector>
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/status.h"
#include "rocksdb/trace_record.h"
namespace ROCKSDB_NAMESPACE {
// Handler to execute TraceRecord.
class TraceExecutionHandler : public TraceRecord::Handler {
public:
TraceExecutionHandler(DB* db,
const std::vector<ColumnFamilyHandle*>& handles);
virtual ~TraceExecutionHandler() override;
virtual Status Handle(const WriteQueryTraceRecord& record) override;
virtual Status Handle(const GetQueryTraceRecord& record) override;
virtual Status Handle(const IteratorSeekQueryTraceRecord& record) override;
virtual Status Handle(const MultiGetQueryTraceRecord& record) override;
private:
DB* db_;
std::unordered_map<uint32_t, ColumnFamilyHandle*> cf_map_;
WriteOptions write_opts_;
ReadOptions read_opts_;
};
// To do: Handler for trace_analyzer.
} // namespace ROCKSDB_NAMESPACE

600
trace_replay/trace_replay.cc
View File

@ -11,6 +11,7 @@
#include "db/db_impl/db_impl.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/options.h"
#include "rocksdb/slice.h"
#include "rocksdb/system_clock.h"
@ -18,7 +19,6 @@
#include "rocksdb/write_batch.h"
#include "util/coding.h"
#include "util/string_util.h"
#include "util/threadpool_imp.h"
namespace ROCKSDB_NAMESPACE {
@ -104,6 +104,20 @@ Status TracerHelper::DecodeTrace(const std::string& encoded_trace,
return Status::OK();
}
Status TracerHelper::DecodeHeader(const std::string& encoded_trace,
Trace* header) {
Status s = TracerHelper::DecodeTrace(encoded_trace, header);
if (header->type != kTraceBegin) {
return Status::Corruption("Corrupted trace file. Incorrect header.");
}
if (header->payload.substr(0, kTraceMagic.length()) != kTraceMagic) {
return Status::Corruption("Corrupted trace file. Incorrect magic.");
}
return s;
}
bool TracerHelper::SetPayloadMap(uint64_t& payload_map,
const TracePayloadType payload_type) {
uint64_t old_state = payload_map;
@ -112,18 +126,26 @@ bool TracerHelper::SetPayloadMap(uint64_t& payload_map,
return old_state != payload_map;
}
void TracerHelper::DecodeWritePayload(Trace* trace,
WritePayload* write_payload) {
assert(write_payload != nullptr);
Status TracerHelper::DecodeWriteRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record) {
assert(trace != nullptr);
assert(trace->type == kTraceWrite);
PinnableSlice rep;
if (trace_file_version < 2) {
rep.PinSelf(trace->payload);
} else {
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
Slice write_batch_data;
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos = static_cast<uint32_t>(log2(payload_map & -payload_map));
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kWriteBatchData:
GetLengthPrefixedSlice(&buf, &(write_payload->write_batch_data));
GetLengthPrefixedSlice(&buf, &write_batch_data);
break;
default:
assert(false);
@ -131,22 +153,40 @@ void TracerHelper::DecodeWritePayload(Trace* trace,
// unset the rightmost bit.
payload_map &= (payload_map - 1);
}
rep.PinSelf(write_batch_data);
}
void TracerHelper::DecodeGetPayload(Trace* trace, GetPayload* get_payload) {
assert(get_payload != nullptr);
if (record != nullptr) {
record->reset(new WriteQueryTraceRecord(std::move(rep), trace->ts));
}
return Status::OK();
}
Status TracerHelper::DecodeGetRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record) {
assert(trace != nullptr);
assert(trace->type == kTraceGet);
uint32_t cf_id = 0;
Slice get_key;
if (trace_file_version < 2) {
DecodeCFAndKey(trace->payload, &cf_id, &get_key);
} else {
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos = static_cast<uint32_t>(log2(payload_map & -payload_map));
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kGetCFID:
GetFixed32(&buf, &(get_payload->cf_id));
GetFixed32(&buf, &cf_id);
break;
case TracePayloadType::kGetKey:
GetLengthPrefixedSlice(&buf, &(get_payload->get_key));
GetLengthPrefixedSlice(&buf, &get_key);
break;
default:
assert(false);
@ -156,26 +196,50 @@ void TracerHelper::DecodeGetPayload(Trace* trace, GetPayload* get_payload) {
}
}
void TracerHelper::DecodeIterPayload(Trace* trace, IterPayload* iter_payload) {
assert(iter_payload != nullptr);
if (record != nullptr) {
PinnableSlice ps;
ps.PinSelf(get_key);
record->reset(new GetQueryTraceRecord(cf_id, std::move(ps), trace->ts));
}
return Status::OK();
}
Status TracerHelper::DecodeIterRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record) {
assert(trace != nullptr);
assert(trace->type == kTraceIteratorSeek ||
trace->type == kTraceIteratorSeekForPrev);
uint32_t cf_id = 0;
Slice iter_key;
if (trace_file_version < 2) {
DecodeCFAndKey(trace->payload, &cf_id, &iter_key);
} else {
// Are these two used anywhere?
Slice lower_bound;
Slice upper_bound;
Slice buf(trace->payload);
GetFixed64(&buf, &trace->payload_map);
int64_t payload_map = static_cast<int64_t>(trace->payload_map);
while (payload_map) {
// Find the rightmost set bit.
uint32_t set_pos = static_cast<uint32_t>(log2(payload_map & -payload_map));
uint32_t set_pos =
static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kIterCFID:
GetFixed32(&buf, &(iter_payload->cf_id));
GetFixed32(&buf, &cf_id);
break;
case TracePayloadType::kIterKey:
GetLengthPrefixedSlice(&buf, &(iter_payload->iter_key));
GetLengthPrefixedSlice(&buf, &iter_key);
break;
case TracePayloadType::kIterLowerBound:
GetLengthPrefixedSlice(&buf, &(iter_payload->lower_bound));
GetLengthPrefixedSlice(&buf, &lower_bound);
break;
case TracePayloadType::kIterUpperBound:
GetLengthPrefixedSlice(&buf, &(iter_payload->upper_bound));
GetLengthPrefixedSlice(&buf, &upper_bound);
break;
default:
assert(false);
@ -185,9 +249,30 @@ void TracerHelper::DecodeIterPayload(Trace* trace, IterPayload* iter_payload) {
}
}
void TracerHelper::DecodeMultiGetPayload(Trace* trace,
MultiGetPayload* multiget_payload) {
assert(multiget_payload != nullptr);
if (record != nullptr) {
PinnableSlice ps_key;
ps_key.PinSelf(iter_key);
record->reset(new IteratorSeekQueryTraceRecord(
static_cast<IteratorSeekQueryTraceRecord::SeekType>(trace->type), cf_id,
std::move(ps_key), trace->ts));
}
return Status::OK();
}
Status TracerHelper::DecodeMultiGetRecord(
Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record) {
assert(trace != nullptr);
assert(trace->type == kTraceMultiGet);
if (trace_file_version < 2) {
return Status::Corruption("MultiGet is not supported.");
}
uint32_t multiget_size = 0;
std::vector<uint32_t> cf_ids;
std::vector<PinnableSlice> multiget_keys;
Slice cfids_payload;
Slice keys_payload;
Slice buf(trace->payload);
@ -198,7 +283,7 @@ void TracerHelper::DecodeMultiGetPayload(Trace* trace,
uint32_t set_pos = static_cast<uint32_t>(log2(payload_map & -payload_map));
switch (set_pos) {
case TracePayloadType::kMultiGetSize:
GetFixed32(&buf, &(multiget_payload->multiget_size));
GetFixed32(&buf, &multiget_size);
break;
case TracePayloadType::kMultiGetCFIDs:
GetLengthPrefixedSlice(&buf, &cfids_payload);
@ -212,18 +297,31 @@ void TracerHelper::DecodeMultiGetPayload(Trace* trace,
// unset the rightmost bit.
payload_map &= (payload_map - 1);
}
if (multiget_size == 0) {
return Status::InvalidArgument("Empty MultiGet cf_ids or keys.");
}
// Decode the cfids_payload and keys_payload
multiget_payload->cf_ids.reserve(multiget_payload->multiget_size);
multiget_payload->multiget_keys.reserve(multiget_payload->multiget_size);
for (uint32_t i = 0; i < multiget_payload->multiget_size; i++) {
cf_ids.reserve(multiget_size);
multiget_keys.reserve(multiget_size);
for (uint32_t i = 0; i < multiget_size; i++) {
uint32_t tmp_cfid;
Slice tmp_key;
GetFixed32(&cfids_payload, &tmp_cfid);
GetLengthPrefixedSlice(&keys_payload, &tmp_key);
multiget_payload->cf_ids.push_back(tmp_cfid);
multiget_payload->multiget_keys.push_back(tmp_key.ToString());
cf_ids.push_back(tmp_cfid);
Slice s(tmp_key);
PinnableSlice ps;
ps.PinSelf(s);
multiget_keys.push_back(std::move(ps));
}
if (record != nullptr) {
record->reset(new MultiGetQueryTraceRecord(
std::move(cf_ids), std::move(multiget_keys), trace->ts));
}
return Status::OK();
}
Tracer::Tracer(SystemClock* clock, const TraceOptions& trace_options,
@ -418,10 +516,9 @@ bool Tracer::ShouldSkipTrace(const TraceType& trace_type) {
if (IsTraceFileOverMax()) {
return true;
}
if ((trace_options_.filter & kTraceFilterGet
&& trace_type == kTraceGet)
|| (trace_options_.filter & kTraceFilterWrite
&& trace_type == kTraceWrite)) {
if ((trace_options_.filter & kTraceFilterGet && trace_type == kTraceGet) ||
(trace_options_.filter & kTraceFilterWrite &&
trace_type == kTraceWrite)) {
return true;
}
++trace_request_count_;
@ -471,445 +568,4 @@ Status Tracer::WriteTrace(const Trace& trace) {
Status Tracer::Close() { return WriteFooter(); }
Replayer::Replayer(DB* db, const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader)
: trace_reader_(std::move(reader)) {
assert(db != nullptr);
db_ = static_cast<DBImpl*>(db->GetRootDB());
env_ = Env::Default();
for (ColumnFamilyHandle* cfh : handles) {
cf_map_[cfh->GetID()] = cfh;
}
fast_forward_ = 1;
}
Replayer::~Replayer() { trace_reader_.reset(); }
Status Replayer::SetFastForward(uint32_t fast_forward) {
Status s;
if (fast_forward < 1) {
s = Status::InvalidArgument("Wrong fast forward speed!");
} else {
fast_forward_ = fast_forward;
s = Status::OK();
}
return s;
}
Status Replayer::Replay() {
Status s;
Trace header;
int db_version;
s = ReadHeader(&header);
if (!s.ok()) {
return s;
}
s = TracerHelper::ParseTraceHeader(header, &trace_file_version_, &db_version);
if (!s.ok()) {
return s;
}
std::chrono::system_clock::time_point replay_epoch =
std::chrono::system_clock::now();
WriteOptions woptions;
ReadOptions roptions;
Trace trace;
uint64_t ops = 0;
Iterator* single_iter = nullptr;
while (s.ok()) {
trace.reset();
s = ReadTrace(&trace);
if (!s.ok()) {
break;
}
std::this_thread::sleep_until(
replay_epoch +
std::chrono::microseconds((trace.ts - header.ts) / fast_forward_));
if (trace.type == kTraceWrite) {
if (trace_file_version_ < 2) {
WriteBatch batch(trace.payload);
db_->Write(woptions, &batch);
} else {
WritePayload w_payload;
TracerHelper::DecodeWritePayload(&trace, &w_payload);
WriteBatch batch(w_payload.write_batch_data.ToString());
db_->Write(woptions, &batch);
}
ops++;
} else if (trace.type == kTraceGet) {
GetPayload get_payload;
get_payload.cf_id = 0;
get_payload.get_key = 0;
if (trace_file_version_ < 2) {
DecodeCFAndKey(trace.payload, &get_payload.cf_id, &get_payload.get_key);
} else {
TracerHelper::DecodeGetPayload(&trace, &get_payload);
}
if (get_payload.cf_id > 0 &&
cf_map_.find(get_payload.cf_id) == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
std::string value;
if (get_payload.cf_id == 0) {
db_->Get(roptions, get_payload.get_key, &value);
} else {
db_->Get(roptions, cf_map_[get_payload.cf_id], get_payload.get_key,
&value);
}
ops++;
} else if (trace.type == kTraceIteratorSeek) {
// Currently, we only support to call Seek. The Next() and Prev() is not
// supported.
IterPayload iter_payload;
iter_payload.cf_id = 0;
if (trace_file_version_ < 2) {
DecodeCFAndKey(trace.payload, &iter_payload.cf_id,
&iter_payload.iter_key);
} else {
TracerHelper::DecodeIterPayload(&trace, &iter_payload);
}
if (iter_payload.cf_id > 0 &&
cf_map_.find(iter_payload.cf_id) == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
if (iter_payload.cf_id == 0) {
single_iter = db_->NewIterator(roptions);
} else {
single_iter = db_->NewIterator(roptions, cf_map_[iter_payload.cf_id]);
}
single_iter->Seek(iter_payload.iter_key);
ops++;
delete single_iter;
} else if (trace.type == kTraceIteratorSeekForPrev) {
// Currently, we only support to call SeekForPrev. The Next() and Prev()
// is not supported.
IterPayload iter_payload;
iter_payload.cf_id = 0;
if (trace_file_version_ < 2) {
DecodeCFAndKey(trace.payload, &iter_payload.cf_id,
&iter_payload.iter_key);
} else {
TracerHelper::DecodeIterPayload(&trace, &iter_payload);
}
if (iter_payload.cf_id > 0 &&
cf_map_.find(iter_payload.cf_id) == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
if (iter_payload.cf_id == 0) {
single_iter = db_->NewIterator(roptions);
} else {
single_iter = db_->NewIterator(roptions, cf_map_[iter_payload.cf_id]);
}
single_iter->SeekForPrev(iter_payload.iter_key);
ops++;
delete single_iter;
} else if (trace.type == kTraceMultiGet) {
MultiGetPayload multiget_payload;
assert(trace_file_version_ >= 2);
TracerHelper::DecodeMultiGetPayload(&trace, &multiget_payload);
std::vector<ColumnFamilyHandle*> v_cfd;
std::vector<Slice> keys;
assert(multiget_payload.cf_ids.size() ==
multiget_payload.multiget_keys.size());
for (size_t i = 0; i < multiget_payload.cf_ids.size(); i++) {
assert(i < multiget_payload.cf_ids.size() &&
i < multiget_payload.multiget_keys.size());
if (cf_map_.find(multiget_payload.cf_ids[i]) == cf_map_.end()) {
return Status::Corruption("Invalid Column Family ID.");
}
v_cfd.push_back(cf_map_[multiget_payload.cf_ids[i]]);
keys.push_back(Slice(multiget_payload.multiget_keys[i]));
}
std::vector<std::string> values;
std::vector<Status> ss = db_->MultiGet(roptions, v_cfd, keys, &values);
} else if (trace.type == kTraceEnd) {
// Do nothing for now.
// TODO: Add some validations later.
break;
}
}
if (s.IsIncomplete()) {
// Reaching eof returns Incomplete status at the moment.
// Could happen when killing a process without calling EndTrace() API.
// TODO: Add better error handling.
return Status::OK();
}
return s;
}
// The trace can be replayed with multithread by configurnge the number of
// threads in the thread pool. Trace records are read from the trace file
// sequentially and the corresponding queries are scheduled in the task
// queue based on the timestamp. Currently, we support Write_batch (Put,
// Delete, SingleDelete, DeleteRange), Get, Iterator (Seek and SeekForPrev).
Status Replayer::MultiThreadReplay(uint32_t threads_num) {
Status s;
Trace header;
int db_version;
s = ReadHeader(&header);
if (!s.ok()) {
return s;
}
s = TracerHelper::ParseTraceHeader(header, &trace_file_version_, &db_version);
if (!s.ok()) {
return s;
}
ThreadPoolImpl thread_pool;
thread_pool.SetHostEnv(env_);
if (threads_num > 1) {
thread_pool.SetBackgroundThreads(static_cast<int>(threads_num));
} else {
thread_pool.SetBackgroundThreads(1);
}
std::chrono::system_clock::time_point replay_epoch =
std::chrono::system_clock::now();
WriteOptions woptions;
ReadOptions roptions;
uint64_t ops = 0;
while (s.ok()) {
std::unique_ptr<ReplayerWorkerArg> ra(new ReplayerWorkerArg);
ra->db = db_;
s = ReadTrace(&(ra->trace_entry));
if (!s.ok()) {
break;
}
ra->cf_map = &cf_map_;
ra->woptions = woptions;
ra->roptions = roptions;
ra->trace_file_version = trace_file_version_;
std::this_thread::sleep_until(
replay_epoch + std::chrono::microseconds(
(ra->trace_entry.ts - header.ts) / fast_forward_));
if (ra->trace_entry.type == kTraceWrite) {
thread_pool.Schedule(&Replayer::BGWorkWriteBatch, ra.release(), nullptr,
nullptr);
ops++;
} else if (ra->trace_entry.type == kTraceGet) {
thread_pool.Schedule(&Replayer::BGWorkGet, ra.release(), nullptr,
nullptr);
ops++;
} else if (ra->trace_entry.type == kTraceIteratorSeek) {
thread_pool.Schedule(&Replayer::BGWorkIterSeek, ra.release(), nullptr,
nullptr);
ops++;
} else if (ra->trace_entry.type == kTraceIteratorSeekForPrev) {
thread_pool.Schedule(&Replayer::BGWorkIterSeekForPrev, ra.release(),
nullptr, nullptr);
ops++;
} else if (ra->trace_entry.type == kTraceMultiGet) {
thread_pool.Schedule(&Replayer::BGWorkMultiGet, ra.release(), nullptr,
nullptr);
ops++;
} else if (ra->trace_entry.type == kTraceEnd) {
// Do nothing for now.
// TODO: Add some validations later.
break;
} else {
// Other trace entry types that are not implemented for replay.
// To finish the replay, we continue the process.
continue;
}
}
if (s.IsIncomplete()) {
// Reaching eof returns Incomplete status at the moment.
// Could happen when killing a process without calling EndTrace() API.
// TODO: Add better error handling.
s = Status::OK();
}
thread_pool.JoinAllThreads();
return s;
}
Status Replayer::ReadHeader(Trace* header) {
assert(header != nullptr);
std::string encoded_trace;
// Read the trace head
Status s = trace_reader_->Read(&encoded_trace);
if (!s.ok()) {
return s;
}
s = TracerHelper::DecodeTrace(encoded_trace, header);
if (header->type != kTraceBegin) {
return Status::Corruption("Corrupted trace file. Incorrect header.");
}
if (header->payload.substr(0, kTraceMagic.length()) != kTraceMagic) {
return Status::Corruption("Corrupted trace file. Incorrect magic.");
}
return s;
}
Status Replayer::ReadFooter(Trace* footer) {
assert(footer != nullptr);
Status s = ReadTrace(footer);
if (!s.ok()) {
return s;
}
if (footer->type != kTraceEnd) {
return Status::Corruption("Corrupted trace file. Incorrect footer.");
}
// TODO: Add more validations later
return s;
}
Status Replayer::ReadTrace(Trace* trace) {
assert(trace != nullptr);
std::string encoded_trace;
Status s = trace_reader_->Read(&encoded_trace);
if (!s.ok()) {
return s;
}
return TracerHelper::DecodeTrace(encoded_trace, trace);
}
void Replayer::BGWorkGet(void* arg) {
std::unique_ptr<ReplayerWorkerArg> ra(
reinterpret_cast<ReplayerWorkerArg*>(arg));
assert(ra != nullptr);
auto cf_map = static_cast<std::unordered_map<uint32_t, ColumnFamilyHandle*>*>(
ra->cf_map);
GetPayload get_payload;
get_payload.cf_id = 0;
if (ra->trace_file_version < 2) {
DecodeCFAndKey(ra->trace_entry.payload, &get_payload.cf_id,
&get_payload.get_key);
} else {
TracerHelper::DecodeGetPayload(&(ra->trace_entry), &get_payload);
}
if (get_payload.cf_id > 0 &&
cf_map->find(get_payload.cf_id) == cf_map->end()) {
return;
}
std::string value;
if (get_payload.cf_id == 0) {
ra->db->Get(ra->roptions, get_payload.get_key, &value);
} else {
ra->db->Get(ra->roptions, (*cf_map)[get_payload.cf_id], get_payload.get_key,
&value);
}
return;
}
void Replayer::BGWorkWriteBatch(void* arg) {
std::unique_ptr<ReplayerWorkerArg> ra(
reinterpret_cast<ReplayerWorkerArg*>(arg));
assert(ra != nullptr);
if (ra->trace_file_version < 2) {
WriteBatch batch(ra->trace_entry.payload);
ra->db->Write(ra->woptions, &batch);
} else {
WritePayload w_payload;
TracerHelper::DecodeWritePayload(&(ra->trace_entry), &w_payload);
WriteBatch batch(w_payload.write_batch_data.ToString());
ra->db->Write(ra->woptions, &batch);
}
return;
}
void Replayer::BGWorkIterSeek(void* arg) {
std::unique_ptr<ReplayerWorkerArg> ra(
reinterpret_cast<ReplayerWorkerArg*>(arg));
assert(ra != nullptr);
auto cf_map = static_cast<std::unordered_map<uint32_t, ColumnFamilyHandle*>*>(
ra->cf_map);
IterPayload iter_payload;
iter_payload.cf_id = 0;
if (ra->trace_file_version < 2) {
DecodeCFAndKey(ra->trace_entry.payload, &iter_payload.cf_id,
&iter_payload.iter_key);
} else {
TracerHelper::DecodeIterPayload(&(ra->trace_entry), &iter_payload);
}
if (iter_payload.cf_id > 0 &&
cf_map->find(iter_payload.cf_id) == cf_map->end()) {
return;
}
Iterator* single_iter = nullptr;
if (iter_payload.cf_id == 0) {
single_iter = ra->db->NewIterator(ra->roptions);
} else {
single_iter =
ra->db->NewIterator(ra->roptions, (*cf_map)[iter_payload.cf_id]);
}
single_iter->Seek(iter_payload.iter_key);
delete single_iter;
return;
}
void Replayer::BGWorkIterSeekForPrev(void* arg) {
std::unique_ptr<ReplayerWorkerArg> ra(
reinterpret_cast<ReplayerWorkerArg*>(arg));
assert(ra != nullptr);
auto cf_map = static_cast<std::unordered_map<uint32_t, ColumnFamilyHandle*>*>(
ra->cf_map);
IterPayload iter_payload;
iter_payload.cf_id = 0;
if (ra->trace_file_version < 2) {
DecodeCFAndKey(ra->trace_entry.payload, &iter_payload.cf_id,
&iter_payload.iter_key);
} else {
TracerHelper::DecodeIterPayload(&(ra->trace_entry), &iter_payload);
}
if (iter_payload.cf_id > 0 &&
cf_map->find(iter_payload.cf_id) == cf_map->end()) {
return;
}
Iterator* single_iter = nullptr;
if (iter_payload.cf_id == 0) {
single_iter = ra->db->NewIterator(ra->roptions);
} else {
single_iter =
ra->db->NewIterator(ra->roptions, (*cf_map)[iter_payload.cf_id]);
}
single_iter->SeekForPrev(iter_payload.iter_key);
delete single_iter;
return;
}
void Replayer::BGWorkMultiGet(void* arg) {
std::unique_ptr<ReplayerWorkerArg> ra(
reinterpret_cast<ReplayerWorkerArg*>(arg));
assert(ra != nullptr);
auto cf_map = static_cast<std::unordered_map<uint32_t, ColumnFamilyHandle*>*>(
ra->cf_map);
MultiGetPayload multiget_payload;
if (ra->trace_file_version < 2) {
return;
}
TracerHelper::DecodeMultiGetPayload(&(ra->trace_entry), &multiget_payload);
std::vector<ColumnFamilyHandle*> v_cfd;
std::vector<Slice> keys;
if (multiget_payload.cf_ids.size() != multiget_payload.multiget_keys.size()) {
return;
}
for (size_t i = 0; i < multiget_payload.cf_ids.size(); i++) {
if (cf_map->find(multiget_payload.cf_ids[i]) == cf_map->end()) {
return;
}
v_cfd.push_back((*cf_map)[multiget_payload.cf_ids[i]]);
keys.push_back(Slice(multiget_payload.multiget_keys[i]));
}
std::vector<std::string> values;
std::vector<Status> ss = ra->db->MultiGet(ra->roptions, v_cfd, keys, &values);
return;
}
} // namespace ROCKSDB_NAMESPACE

138
trace_replay/trace_replay.h
View File

@ -5,13 +5,17 @@
#pragma once
#include <atomic>
#include <memory>
#include <mutex>
#include <unordered_map>
#include <utility>
#include "rocksdb/options.h"
#include "rocksdb/rocksdb_namespace.h"
#include "rocksdb/status.h"
#include "rocksdb/trace_record.h"
#include "rocksdb/utilities/replayer.h"
namespace ROCKSDB_NAMESPACE {
@ -43,31 +47,6 @@ const unsigned int kTraceMetadataSize =
static const int kTraceFileMajorVersion = 0;
static const int kTraceFileMinorVersion = 2;
// Supported Trace types.
enum TraceType : char {
kTraceBegin = 1,
kTraceEnd = 2,
kTraceWrite = 3,
kTraceGet = 4,
kTraceIteratorSeek = 5,
kTraceIteratorSeekForPrev = 6,
// Block cache related types.
kBlockTraceIndexBlock = 7,
kBlockTraceFilterBlock = 8,
kBlockTraceDataBlock = 9,
kBlockTraceUncompressionDictBlock = 10,
kBlockTraceRangeDeletionBlock = 11,
// For IOTracing.
kIOTracer = 12,
// For query tracing
kTraceMultiGet = 13,
// 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
@ -105,28 +84,6 @@ enum TracePayloadType : char {
kMultiGetKeys = 10,
};
struct WritePayload {
Slice write_batch_data;
};
struct GetPayload {
uint32_t cf_id = 0;
Slice get_key;
};
struct IterPayload {
uint32_t cf_id = 0;
Slice iter_key;
Slice lower_bound;
Slice upper_bound;
};
struct MultiGetPayload {
uint32_t multiget_size;
std::vector<uint32_t> cf_ids;
std::vector<std::string> multiget_keys;
};
class TracerHelper {
public:
// Parse the string with major and minor version only
@ -142,22 +99,28 @@ class TracerHelper {
// Decode a string into the given trace object.
static Status DecodeTrace(const std::string& encoded_trace, Trace* trace);
// Decode a string into the given trace header.
static Status DecodeHeader(const std::string& encoded_trace, Trace* header);
// Set the payload map based on the payload type
static bool SetPayloadMap(uint64_t& payload_map,
const TracePayloadType payload_type);
// Decode the write payload and store in WrteiPayload
static void DecodeWritePayload(Trace* trace, WritePayload* write_payload);
static Status DecodeWriteRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record);
// Decode the get payload and store in WrteiPayload
static void DecodeGetPayload(Trace* trace, GetPayload* get_payload);
static Status DecodeGetRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record);
// Decode the iter payload and store in WrteiPayload
static void DecodeIterPayload(Trace* trace, IterPayload* iter_payload);
static Status DecodeIterRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record);
// Decode the multiget payload and store in MultiGetPayload
static void DecodeMultiGetPayload(Trace* trace,
MultiGetPayload* multiget_payload);
static Status DecodeMultiGetRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record);
};
// Tracer captures all RocksDB operations using a user-provided TraceWriter.
@ -222,75 +185,4 @@ class Tracer {
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();
// Replay the provide trace stream, which is the same as Replay(), with
// multi-threads. Queries are scheduled in the thread pool job queue.
// User can set the number of threads in the thread pool.
Status MultiThreadReplay(uint32_t threads_num);
// 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);
// The background function for MultiThreadReplay to execute Get query
// based on the trace records.
static void BGWorkGet(void* arg);
// The background function for MultiThreadReplay to execute WriteBatch
// (Put, Delete, SingleDelete, DeleteRange) based on the trace records.
static void BGWorkWriteBatch(void* arg);
// The background function for MultiThreadReplay to execute Iterator (Seek)
// based on the trace records.
static void BGWorkIterSeek(void* arg);
// The background function for MultiThreadReplay to execute Iterator
// (SeekForPrev) based on the trace records.
static void BGWorkIterSeekForPrev(void* arg);
// The background function for MultiThreadReplay to execute MultiGet based on
// the trace records
static void BGWorkMultiGet(void* arg);
DBImpl* db_;
Env* env_;
std::unique_ptr<TraceReader> trace_reader_;
std::unordered_map<uint32_t, ColumnFamilyHandle*> cf_map_;
uint32_t fast_forward_;
// When reading the trace header, the trace file version can be parsed.
// Replayer will use different decode method to get the trace content based
// on different trace file version.
int trace_file_version_;
};
// The passin arg of MultiThreadRepkay for each trace record.
struct ReplayerWorkerArg {
DB* db;
Trace trace_entry;
std::unordered_map<uint32_t, ColumnFamilyHandle*>* cf_map;
WriteOptions woptions;
ReadOptions roptions;
int trace_file_version;
};
} // namespace ROCKSDB_NAMESPACE

3
utilities/simulator_cache/cache_simulator.cc
View File

@ -4,8 +4,11 @@
// (found in the LICENSE.Apache file in the root directory).
#include "utilities/simulator_cache/cache_simulator.h"
#include <algorithm>
#include "db/dbformat.h"
#include "rocksdb/trace_record.h"
namespace ROCKSDB_NAMESPACE {

2
utilities/simulator_cache/cache_simulator_test.cc
View File

@ -6,7 +6,9 @@
#include "utilities/simulator_cache/cache_simulator.h"
#include <cstdlib>
#include "rocksdb/env.h"
#include "rocksdb/trace_record.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"

8
utilities/trace/file_trace_reader_writer.cc
View File

@ -31,6 +31,14 @@ Status FileTraceReader::Close() {
return Status::OK();
}
Status FileTraceReader::Reset() {
if (file_reader_ == nullptr) {
return Status::IOError("TraceReader is closed.");
}
offset_ = 0;
return Status::OK();
}
Status FileTraceReader::Read(std::string* data) {
assert(file_reader_ != nullptr);
Status s = file_reader_->Read(IOOptions(), offset_, kTraceMetadataSize,

1
utilities/trace/file_trace_reader_writer.h
View File

@ -20,6 +20,7 @@ class FileTraceReader : public TraceReader {
virtual Status Read(std::string* data) override;
virtual Status Close() override;
virtual Status Reset() override;
private:
std::unique_ptr<RandomAccessFileReader> file_reader_;

305
utilities/trace/replayer_impl.cc Normal file
View File

@ -0,0 +1,305 @@
// 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).
#ifndef ROCKSDB_LITE
#include "utilities/trace/replayer_impl.h"
#include <cmath>
#include <thread>
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/options.h"
#include "rocksdb/slice.h"
#include "rocksdb/status.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/trace_reader_writer.h"
#include "util/threadpool_imp.h"
namespace ROCKSDB_NAMESPACE {
ReplayerImpl::ReplayerImpl(DB* db,
const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader)
: Replayer(),
env_(db->GetEnv()),
trace_reader_(std::move(reader)),
prepared_(false),
trace_end_(false),
header_ts_(0),
exec_handler_(TraceRecord::NewExecutionHandler(db, handles)) {}
ReplayerImpl::~ReplayerImpl() {
exec_handler_.reset();
trace_reader_.reset();
}
Status ReplayerImpl::Prepare() {
Trace header;
int db_version;
Status s = ReadHeader(&header);
if (!s.ok()) {
return s;
}
s = TracerHelper::ParseTraceHeader(header, &trace_file_version_, &db_version);
if (!s.ok()) {
return s;
}
header_ts_ = header.ts;
prepared_ = true;
trace_end_ = false;
return Status::OK();
}
Status ReplayerImpl::Next(std::unique_ptr<TraceRecord>* record) {
if (!prepared_) {
return Status::Incomplete("Not prepared!");
}
if (trace_end_) {
return Status::Incomplete("Trace end.");
}
Trace trace;
Status s = ReadTrace(&trace); // ReadTrace is atomic
// Reached the trace end.
if (s.ok() && trace.type == kTraceEnd) {
trace_end_ = true;
return Status::Incomplete("Trace end.");
}
if (!s.ok() || record == nullptr) {
return s;
}
return DecodeTraceRecord(&trace, trace_file_version_, record);
}
Status ReplayerImpl::Execute(const std::unique_ptr<TraceRecord>& record) {
return record->Accept(exec_handler_.get());
}
Status ReplayerImpl::Execute(std::unique_ptr<TraceRecord>&& record) {
Status s = record->Accept(exec_handler_.get());
record.reset();
return s;
}
Status ReplayerImpl::Replay(const ReplayOptions& options) {
if (options.fast_forward <= 0.0) {
return Status::InvalidArgument("Wrong fast forward speed!");
}
if (!prepared_) {
return Status::Incomplete("Not prepared!");
}
if (trace_end_) {
return Status::Incomplete("Trace end.");
}
Status s = Status::OK();
if (options.num_threads <= 1) {
// num_threads == 0 or num_threads == 1 uses single thread.
std::chrono::system_clock::time_point replay_epoch =
std::chrono::system_clock::now();
while (s.ok()) {
Trace trace;
s = ReadTrace(&trace);
// If already at trace end, ReadTrace should return Status::Incomplete().
if (!s.ok()) {
break;
}
// No need to sleep before breaking the loop if at the trace end.
if (trace.type == kTraceEnd) {
trace_end_ = true;
s = Status::Incomplete("Trace end.");
break;
}
// In single-threaded replay, decode first then sleep.
std::unique_ptr<TraceRecord> record;
s = DecodeTraceRecord(&trace, trace_file_version_, &record);
// Skip unsupported traces, stop for other errors.
if (s.IsNotSupported()) {
continue;
} else if (!s.ok()) {
break;
}
std::this_thread::sleep_until(
replay_epoch +
std::chrono::microseconds(static_cast<uint64_t>(std::llround(
1.0 * (trace.ts - header_ts_) / options.fast_forward))));
s = Execute(std::move(record));
}
} else {
// Multi-threaded replay.
ThreadPoolImpl thread_pool;
thread_pool.SetHostEnv(env_);
thread_pool.SetBackgroundThreads(static_cast<int>(options.num_threads));
std::mutex mtx;
// Background decoding and execution status.
Status bg_s = Status::OK();
uint64_t last_err_ts = static_cast<uint64_t>(-1);
// Callback function used in background work to update bg_s at the first
// execution error (with the smallest Trace timestamp).
auto error_cb = [&mtx, &bg_s, &last_err_ts](Status err, uint64_t err_ts) {
std::lock_guard<std::mutex> gd(mtx);
// Only record the first error.
if (!err.ok() && !err.IsNotSupported() && err_ts < last_err_ts) {
bg_s = err;
last_err_ts = err_ts;
}
};
std::chrono::system_clock::time_point replay_epoch =
std::chrono::system_clock::now();
while (bg_s.ok() && s.ok()) {
Trace trace;
s = ReadTrace(&trace);
// If already at trace end, ReadTrace should return Status::Incomplete().
if (!s.ok()) {
break;
}
TraceType trace_type = trace.type;
// No need to sleep before breaking the loop if at the trace end.
if (trace_type == kTraceEnd) {
trace_end_ = true;
s = Status::Incomplete("Trace end.");
break;
}
// In multi-threaded replay, sleep first thatn start decoding and
// execution in a thread.
std::this_thread::sleep_until(
replay_epoch +
std::chrono::microseconds(static_cast<uint64_t>(std::llround(
1.0 * (trace.ts - header_ts_) / options.fast_forward))));
if (trace_type == kTraceWrite || trace_type == kTraceGet ||
trace_type == kTraceIteratorSeek ||
trace_type == kTraceIteratorSeekForPrev ||
trace_type == kTraceMultiGet) {
std::unique_ptr<ReplayerWorkerArg> ra(new ReplayerWorkerArg);
ra->trace_entry = std::move(trace);
ra->handler = exec_handler_.get();
ra->trace_file_version = trace_file_version_;
ra->error_cb = error_cb;
thread_pool.Schedule(&ReplayerImpl::BackgroundWork, ra.release(),
nullptr, nullptr);
}
// Skip unsupported traces.
}
thread_pool.WaitForJobsAndJoinAllThreads();
if (!bg_s.ok()) {
s = bg_s;
}
}
if (s.IsIncomplete()) {
// Reaching eof returns Incomplete status at the moment.
// Could happen when killing a process without calling EndTrace() API.
// TODO: Add better error handling.
trace_end_ = true;
return Status::OK();
}
return s;
}
uint64_t ReplayerImpl::GetHeaderTimestamp() const { return header_ts_; }
Status ReplayerImpl::ReadHeader(Trace* header) {
assert(header != nullptr);
Status s = trace_reader_->Reset();
if (!s.ok()) {
return s;
}
std::string encoded_trace;
// Read the trace head
s = trace_reader_->Read(&encoded_trace);
if (!s.ok()) {
return s;
}
return TracerHelper::DecodeHeader(encoded_trace, header);
}
Status ReplayerImpl::ReadFooter(Trace* footer) {
assert(footer != nullptr);
Status s = ReadTrace(footer);
if (!s.ok()) {
return s;
}
if (footer->type != kTraceEnd) {
return Status::Corruption("Corrupted trace file. Incorrect footer.");
}
// TODO: Add more validations later
return s;
}
Status ReplayerImpl::ReadTrace(Trace* trace) {
assert(trace != nullptr);
std::string encoded_trace;
// We don't know if TraceReader is implemented thread-safe, so we protect the
// reading trace part with a mutex. The decoding part does not need to be
// protected since it's local.
{
std::lock_guard<std::mutex> guard(mutex_);
Status s = trace_reader_->Read(&encoded_trace);
if (!s.ok()) {
return s;
}
}
return TracerHelper::DecodeTrace(encoded_trace, trace);
}
Status ReplayerImpl::DecodeTraceRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record) {
switch (trace->type) {
case kTraceWrite:
return TracerHelper::DecodeWriteRecord(trace, trace_file_version, record);
case kTraceGet:
return TracerHelper::DecodeGetRecord(trace, trace_file_version, record);
case kTraceIteratorSeek:
case kTraceIteratorSeekForPrev:
return TracerHelper::DecodeIterRecord(trace, trace_file_version, record);
case kTraceMultiGet:
return TracerHelper::DecodeMultiGetRecord(trace, trace_file_version,
record);
case kTraceEnd:
return Status::Incomplete("Trace end.");
default:
return Status::NotSupported("Unsupported trace type.");
}
}
void ReplayerImpl::BackgroundWork(void* arg) {
std::unique_ptr<ReplayerWorkerArg> ra(
reinterpret_cast<ReplayerWorkerArg*>(arg));
assert(ra != nullptr);
std::unique_ptr<TraceRecord> record;
Status s =
DecodeTraceRecord(&(ra->trace_entry), ra->trace_file_version, &record);
if (s.ok()) {
s = record->Accept(ra->handler);
record.reset();
}
if (!s.ok() && ra->error_cb) {
ra->error_cb(s, ra->trace_entry.ts);
}
}
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE

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// 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
#ifndef ROCKSDB_LITE
#include <atomic>
#include <functional>
#include <memory>
#include <mutex>
#include <unordered_map>
#include "rocksdb/rocksdb_namespace.h"
#include "rocksdb/trace_record.h"
#include "rocksdb/utilities/replayer.h"
#include "trace_replay/trace_replay.h"
namespace ROCKSDB_NAMESPACE {
class ColumnFamilyHandle;
class DB;
class Env;
class TraceReader;
class TraceRecord;
class Status;
struct ReplayOptions;
class ReplayerImpl : public Replayer {
public:
ReplayerImpl(DB* db, const std::vector<ColumnFamilyHandle*>& handles,
std::unique_ptr<TraceReader>&& reader);
~ReplayerImpl() override;
using Replayer::Prepare;
Status Prepare() override;
using Replayer::Next;
Status Next(std::unique_ptr<TraceRecord>* record) override;
using Replayer::Execute;
Status Execute(const std::unique_ptr<TraceRecord>& record) override;
Status Execute(std::unique_ptr<TraceRecord>&& record) override;
using Replayer::Replay;
Status Replay(const ReplayOptions& options) override;
using Replayer::GetHeaderTimestamp;
uint64_t GetHeaderTimestamp() const override;
private:
Status ReadHeader(Trace* header);
Status ReadFooter(Trace* footer);
Status ReadTrace(Trace* trace);
// Generic function to convert a Trace to TraceRecord.
static Status DecodeTraceRecord(Trace* trace, int trace_file_version,
std::unique_ptr<TraceRecord>* record);
// Generic function to execute a Trace in a thread pool.
static void BackgroundWork(void* arg);
Env* env_;
std::unique_ptr<TraceReader> trace_reader_;
// When reading the trace header, the trace file version can be parsed.
// Replayer will use different decode method to get the trace content based
// on different trace file version.
int trace_file_version_;
std::mutex mutex_;
std::atomic<bool> prepared_;
std::atomic<bool> trace_end_;
uint64_t header_ts_;
std::unique_ptr<TraceRecord::Handler> exec_handler_;
};
// The passin arg of MultiThreadRepkay for each trace record.
struct ReplayerWorkerArg {
Trace trace_entry;
int trace_file_version;
// Handler to execute TraceRecord.
TraceRecord::Handler* handler;
// Callback function to report the error status and the timestamp of the
// TraceRecord.
std::function<void(Status, uint64_t)> error_cb;
};
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE