From 6c62f2a6f00c939d5ddf5c914f0a4c3fb8d6d69e Mon Sep 17 00:00:00 2001 From: ddval <10481361+ddval@user.noreply.gitee.com> Date: Fri, 13 Jun 2025 09:13:16 +0800 Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=A2=9Etrace=5Frepaly=E5=AD=90?= =?UTF-8?q?=E7=9B=AE=E5=BD=95=E5=B9=B6=E6=B7=BB=E5=8A=A0block=5Fcache=5Ftr?= =?UTF-8?q?acer=E5=8A=9F=E8=83=BD?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../trace_replay/block_cache_tracer.cc | 496 ++++++++++++++++++ .../rocksdb/trace_replay/block_cache_tracer.h | 294 +++++++++++ .../trace_replay/block_cache_tracer_test.cc | 378 +++++++++++++ 3 files changed, 1168 insertions(+) create mode 100644 storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.cc create mode 100644 storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.h create mode 100644 storage/rocksdb/rocksdb/trace_replay/block_cache_tracer_test.cc diff --git a/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.cc b/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.cc new file mode 100644 index 000000000..a7bd39278 --- /dev/null +++ b/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.cc @@ -0,0 +1,496 @@ +// 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/block_cache_tracer.h" + +#include +#include +#include + +#include "db/db_impl/db_impl.h" +#include "db/dbformat.h" +#include "rocksdb/slice.h" +#include "util/coding.h" +#include "util/hash.h" +#include "util/string_util.h" + +namespace ROCKSDB_NAMESPACE { + +namespace { +bool ShouldTrace(const Slice& block_key, const TraceOptions& trace_options) { + if (trace_options.sampling_frequency == 0 || + trace_options.sampling_frequency == 1) { + return true; + } + // We use spatial downsampling so that we have a complete access history for a + // block. + return 0 == GetSliceRangedNPHash(block_key, trace_options.sampling_frequency); +} +} // namespace + +const uint64_t kMicrosInSecond = 1000 * 1000; +const uint64_t kSecondInMinute = 60; +const uint64_t kSecondInHour = 3600; +const std::string BlockCacheTraceHelper::kUnknownColumnFamilyName = + "UnknownColumnFamily"; +const uint64_t BlockCacheTraceHelper::kReservedGetId = 0; + +bool BlockCacheTraceHelper::IsGetOrMultiGetOnDataBlock( + TraceType block_type, TableReaderCaller caller) { + return (block_type == TraceType::kBlockTraceDataBlock) && + IsGetOrMultiGet(caller); +} + +bool BlockCacheTraceHelper::IsGetOrMultiGet(TableReaderCaller caller) { + return caller == TableReaderCaller::kUserGet || + caller == TableReaderCaller::kUserMultiGet; +} + +bool BlockCacheTraceHelper::IsUserAccess(TableReaderCaller caller) { + return caller == TableReaderCaller::kUserGet || + caller == TableReaderCaller::kUserMultiGet || + caller == TableReaderCaller::kUserIterator || + caller == TableReaderCaller::kUserApproximateSize || + caller == TableReaderCaller::kUserVerifyChecksum; +} + +std::string BlockCacheTraceHelper::ComputeRowKey( + const BlockCacheTraceRecord& access) { + if (!IsGetOrMultiGet(access.caller)) { + return ""; + } + Slice key = ExtractUserKey(access.referenced_key); + return std::to_string(access.sst_fd_number) + "_" + key.ToString(); +} + +uint64_t BlockCacheTraceHelper::GetTableId( + const BlockCacheTraceRecord& access) { + if (!IsGetOrMultiGet(access.caller) || access.referenced_key.size() < 4) { + return 0; + } + return static_cast(DecodeFixed32(access.referenced_key.data())) + 1; +} + +uint64_t BlockCacheTraceHelper::GetSequenceNumber( + const BlockCacheTraceRecord& access) { + if (!IsGetOrMultiGet(access.caller)) { + return 0; + } + return access.get_from_user_specified_snapshot == Boolean::kFalse + ? 0 + : 1 + GetInternalKeySeqno(access.referenced_key); +} + +uint64_t BlockCacheTraceHelper::GetBlockOffsetInFile( + const BlockCacheTraceRecord& access) { + Slice input(access.block_key); + uint64_t offset = 0; + while (true) { + uint64_t tmp = 0; + if (GetVarint64(&input, &tmp)) { + offset = tmp; + } else { + break; + } + } + return offset; +} + +BlockCacheTraceWriter::BlockCacheTraceWriter( + Env* env, const TraceOptions& trace_options, + std::unique_ptr&& trace_writer) + : env_(env), + trace_options_(trace_options), + trace_writer_(std::move(trace_writer)) {} + +Status BlockCacheTraceWriter::WriteBlockAccess( + const BlockCacheTraceRecord& record, const Slice& block_key, + const Slice& cf_name, const Slice& referenced_key) { + uint64_t trace_file_size = trace_writer_->GetFileSize(); + if (trace_file_size > trace_options_.max_trace_file_size) { + return Status::OK(); + } + Trace trace; + trace.ts = record.access_timestamp; + trace.type = record.block_type; + PutLengthPrefixedSlice(&trace.payload, block_key); + PutFixed64(&trace.payload, record.block_size); + PutFixed64(&trace.payload, record.cf_id); + PutLengthPrefixedSlice(&trace.payload, cf_name); + PutFixed32(&trace.payload, record.level); + PutFixed64(&trace.payload, record.sst_fd_number); + trace.payload.push_back(record.caller); + trace.payload.push_back(record.is_cache_hit); + trace.payload.push_back(record.no_insert); + if (BlockCacheTraceHelper::IsGetOrMultiGet(record.caller)) { + PutFixed64(&trace.payload, record.get_id); + trace.payload.push_back(record.get_from_user_specified_snapshot); + PutLengthPrefixedSlice(&trace.payload, referenced_key); + } + if (BlockCacheTraceHelper::IsGetOrMultiGetOnDataBlock(record.block_type, + record.caller)) { + PutFixed64(&trace.payload, record.referenced_data_size); + PutFixed64(&trace.payload, record.num_keys_in_block); + trace.payload.push_back(record.referenced_key_exist_in_block); + } + std::string encoded_trace; + TracerHelper::EncodeTrace(trace, &encoded_trace); + return trace_writer_->Write(encoded_trace); +} + +Status BlockCacheTraceWriter::WriteHeader() { + Trace trace; + trace.ts = env_->NowMicros(); + trace.type = TraceType::kTraceBegin; + PutLengthPrefixedSlice(&trace.payload, kTraceMagic); + PutFixed32(&trace.payload, kMajorVersion); + PutFixed32(&trace.payload, kMinorVersion); + std::string encoded_trace; + TracerHelper::EncodeTrace(trace, &encoded_trace); + return trace_writer_->Write(encoded_trace); +} + +BlockCacheTraceReader::BlockCacheTraceReader( + std::unique_ptr&& reader) + : trace_reader_(std::move(reader)) {} + +Status BlockCacheTraceReader::ReadHeader(BlockCacheTraceHeader* header) { + assert(header != nullptr); + std::string encoded_trace; + Status s = trace_reader_->Read(&encoded_trace); + if (!s.ok()) { + return s; + } + Trace trace; + s = TracerHelper::DecodeTrace(encoded_trace, &trace); + if (!s.ok()) { + return s; + } + header->start_time = trace.ts; + Slice enc_slice = Slice(trace.payload); + Slice magnic_number; + if (!GetLengthPrefixedSlice(&enc_slice, &magnic_number)) { + return Status::Corruption( + "Corrupted header in the trace file: Failed to read the magic number."); + } + if (magnic_number.ToString() != kTraceMagic) { + return Status::Corruption( + "Corrupted header in the trace file: Magic number does not match."); + } + if (!GetFixed32(&enc_slice, &header->rocksdb_major_version)) { + return Status::Corruption( + "Corrupted header in the trace file: Failed to read rocksdb major " + "version number."); + } + if (!GetFixed32(&enc_slice, &header->rocksdb_minor_version)) { + return Status::Corruption( + "Corrupted header in the trace file: Failed to read rocksdb minor " + "version number."); + } + // We should have retrieved all information in the header. + if (!enc_slice.empty()) { + return Status::Corruption( + "Corrupted header in the trace file: The length of header is too " + "long."); + } + return Status::OK(); +} + +Status BlockCacheTraceReader::ReadAccess(BlockCacheTraceRecord* record) { + assert(record); + std::string encoded_trace; + Status s = trace_reader_->Read(&encoded_trace); + if (!s.ok()) { + return s; + } + Trace trace; + s = TracerHelper::DecodeTrace(encoded_trace, &trace); + if (!s.ok()) { + return s; + } + record->access_timestamp = trace.ts; + record->block_type = trace.type; + Slice enc_slice = Slice(trace.payload); + + const unsigned int kCharSize = 1; + + Slice block_key; + if (!GetLengthPrefixedSlice(&enc_slice, &block_key)) { + return Status::Incomplete( + "Incomplete access record: Failed to read block key."); + } + record->block_key = block_key.ToString(); + if (!GetFixed64(&enc_slice, &record->block_size)) { + return Status::Incomplete( + "Incomplete access record: Failed to read block size."); + } + if (!GetFixed64(&enc_slice, &record->cf_id)) { + return Status::Incomplete( + "Incomplete access record: Failed to read column family ID."); + } + Slice cf_name; + if (!GetLengthPrefixedSlice(&enc_slice, &cf_name)) { + return Status::Incomplete( + "Incomplete access record: Failed to read column family name."); + } + record->cf_name = cf_name.ToString(); + if (!GetFixed32(&enc_slice, &record->level)) { + return Status::Incomplete( + "Incomplete access record: Failed to read level."); + } + if (!GetFixed64(&enc_slice, &record->sst_fd_number)) { + return Status::Incomplete( + "Incomplete access record: Failed to read SST file number."); + } + if (enc_slice.empty()) { + return Status::Incomplete( + "Incomplete access record: Failed to read caller."); + } + record->caller = static_cast(enc_slice[0]); + enc_slice.remove_prefix(kCharSize); + if (enc_slice.empty()) { + return Status::Incomplete( + "Incomplete access record: Failed to read is_cache_hit."); + } + record->is_cache_hit = static_cast(enc_slice[0]); + enc_slice.remove_prefix(kCharSize); + if (enc_slice.empty()) { + return Status::Incomplete( + "Incomplete access record: Failed to read no_insert."); + } + record->no_insert = static_cast(enc_slice[0]); + enc_slice.remove_prefix(kCharSize); + if (BlockCacheTraceHelper::IsGetOrMultiGet(record->caller)) { + if (!GetFixed64(&enc_slice, &record->get_id)) { + return Status::Incomplete( + "Incomplete access record: Failed to read the get id."); + } + if (enc_slice.empty()) { + return Status::Incomplete( + "Incomplete access record: Failed to read " + "get_from_user_specified_snapshot."); + } + record->get_from_user_specified_snapshot = + static_cast(enc_slice[0]); + enc_slice.remove_prefix(kCharSize); + Slice referenced_key; + if (!GetLengthPrefixedSlice(&enc_slice, &referenced_key)) { + return Status::Incomplete( + "Incomplete access record: Failed to read the referenced key."); + } + record->referenced_key = referenced_key.ToString(); + } + if (BlockCacheTraceHelper::IsGetOrMultiGetOnDataBlock(record->block_type, + record->caller)) { + if (!GetFixed64(&enc_slice, &record->referenced_data_size)) { + return Status::Incomplete( + "Incomplete access record: Failed to read the referenced data size."); + } + if (!GetFixed64(&enc_slice, &record->num_keys_in_block)) { + return Status::Incomplete( + "Incomplete access record: Failed to read the number of keys in the " + "block."); + } + if (enc_slice.empty()) { + return Status::Incomplete( + "Incomplete access record: Failed to read " + "referenced_key_exist_in_block."); + } + record->referenced_key_exist_in_block = static_cast(enc_slice[0]); + } + return Status::OK(); +} + +BlockCacheHumanReadableTraceWriter::~BlockCacheHumanReadableTraceWriter() { + if (human_readable_trace_file_writer_) { + human_readable_trace_file_writer_->Flush().PermitUncheckedError(); + human_readable_trace_file_writer_->Close().PermitUncheckedError(); + } +} + +Status BlockCacheHumanReadableTraceWriter::NewWritableFile( + const std::string& human_readable_trace_file_path, + ROCKSDB_NAMESPACE::Env* env) { + if (human_readable_trace_file_path.empty()) { + return Status::InvalidArgument( + "The provided human_readable_trace_file_path is null."); + } + return env->NewWritableFile(human_readable_trace_file_path, + &human_readable_trace_file_writer_, EnvOptions()); +} + +Status BlockCacheHumanReadableTraceWriter::WriteHumanReadableTraceRecord( + const BlockCacheTraceRecord& access, uint64_t block_id, + uint64_t get_key_id) { + if (!human_readable_trace_file_writer_) { + return Status::OK(); + } + int ret = snprintf( + trace_record_buffer_, sizeof(trace_record_buffer_), + "%" PRIu64 ",%" PRIu64 ",%u,%" PRIu64 ",%" PRIu64 ",%s,%" PRIu32 + ",%" PRIu64 ",%u,%u,%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%u,%u,%" PRIu64 + ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 "\n", + access.access_timestamp, block_id, access.block_type, access.block_size, + access.cf_id, access.cf_name.c_str(), access.level, access.sst_fd_number, + access.caller, access.no_insert, access.get_id, get_key_id, + access.referenced_data_size, access.is_cache_hit, + access.referenced_key_exist_in_block, access.num_keys_in_block, + BlockCacheTraceHelper::GetTableId(access), + BlockCacheTraceHelper::GetSequenceNumber(access), + static_cast(access.block_key.size()), + static_cast(access.referenced_key.size()), + BlockCacheTraceHelper::GetBlockOffsetInFile(access)); + if (ret < 0) { + return Status::IOError("failed to format the output"); + } + std::string printout(trace_record_buffer_); + return human_readable_trace_file_writer_->Append(printout); +} + +BlockCacheHumanReadableTraceReader::BlockCacheHumanReadableTraceReader( + const std::string& trace_file_path) + : BlockCacheTraceReader(/*trace_reader=*/nullptr) { + human_readable_trace_reader_.open(trace_file_path, std::ifstream::in); +} + +BlockCacheHumanReadableTraceReader::~BlockCacheHumanReadableTraceReader() { + human_readable_trace_reader_.close(); +} + +Status BlockCacheHumanReadableTraceReader::ReadHeader( + BlockCacheTraceHeader* /*header*/) { + return Status::OK(); +} + +Status BlockCacheHumanReadableTraceReader::ReadAccess( + BlockCacheTraceRecord* record) { + std::string line; + if (!std::getline(human_readable_trace_reader_, line)) { + return Status::Incomplete("No more records to read."); + } + std::stringstream ss(line); + std::vector record_strs; + while (ss.good()) { + std::string substr; + getline(ss, substr, ','); + record_strs.push_back(substr); + } + if (record_strs.size() != 21) { + return Status::Incomplete("Records format is wrong."); + } + + record->access_timestamp = ParseUint64(record_strs[0]); + uint64_t block_key = ParseUint64(record_strs[1]); + record->block_type = static_cast(ParseUint64(record_strs[2])); + record->block_size = ParseUint64(record_strs[3]); + record->cf_id = ParseUint64(record_strs[4]); + record->cf_name = record_strs[5]; + record->level = static_cast(ParseUint64(record_strs[6])); + record->sst_fd_number = ParseUint64(record_strs[7]); + record->caller = static_cast(ParseUint64(record_strs[8])); + record->no_insert = static_cast(ParseUint64(record_strs[9])); + record->get_id = ParseUint64(record_strs[10]); + uint64_t get_key_id = ParseUint64(record_strs[11]); + + record->referenced_data_size = ParseUint64(record_strs[12]); + record->is_cache_hit = static_cast(ParseUint64(record_strs[13])); + record->referenced_key_exist_in_block = + static_cast(ParseUint64(record_strs[14])); + record->num_keys_in_block = ParseUint64(record_strs[15]); + uint64_t table_id = ParseUint64(record_strs[16]); + if (table_id > 0) { + // Decrement since valid table id in the trace file equals traced table id + // + 1. + table_id -= 1; + } + uint64_t get_sequence_number = ParseUint64(record_strs[17]); + if (get_sequence_number > 0) { + record->get_from_user_specified_snapshot = Boolean::kTrue; + // Decrement since valid seq number in the trace file equals traced seq + // number + 1. + get_sequence_number -= 1; + } + uint64_t block_key_size = ParseUint64(record_strs[18]); + uint64_t get_key_size = ParseUint64(record_strs[19]); + uint64_t block_offset = ParseUint64(record_strs[20]); + + std::string tmp_block_key; + PutVarint64(&tmp_block_key, block_key); + PutVarint64(&tmp_block_key, block_offset); + // Append 1 until the size is the same as traced block key size. + while (record->block_key.size() < block_key_size - tmp_block_key.size()) { + record->block_key += "1"; + } + record->block_key += tmp_block_key; + + if (get_key_id != 0) { + std::string tmp_get_key; + PutFixed64(&tmp_get_key, get_key_id); + PutFixed64(&tmp_get_key, get_sequence_number << 8); + PutFixed32(&record->referenced_key, static_cast(table_id)); + // Append 1 until the size is the same as traced key size. + while (record->referenced_key.size() < get_key_size - tmp_get_key.size()) { + record->referenced_key += "1"; + } + record->referenced_key += tmp_get_key; + } + return Status::OK(); +} + +BlockCacheTracer::BlockCacheTracer() { writer_.store(nullptr); } + +BlockCacheTracer::~BlockCacheTracer() { EndTrace(); } + +Status BlockCacheTracer::StartTrace( + Env* env, const TraceOptions& trace_options, + std::unique_ptr&& trace_writer) { + InstrumentedMutexLock lock_guard(&trace_writer_mutex_); + if (writer_.load()) { + return Status::Busy(); + } + get_id_counter_.store(1); + trace_options_ = trace_options; + writer_.store( + new BlockCacheTraceWriter(env, trace_options, std::move(trace_writer))); + return writer_.load()->WriteHeader(); +} + +void BlockCacheTracer::EndTrace() { + InstrumentedMutexLock lock_guard(&trace_writer_mutex_); + if (!writer_.load()) { + return; + } + delete writer_.load(); + writer_.store(nullptr); +} + +Status BlockCacheTracer::WriteBlockAccess(const BlockCacheTraceRecord& record, + const Slice& block_key, + const Slice& cf_name, + const Slice& referenced_key) { + if (!writer_.load() || !ShouldTrace(block_key, trace_options_)) { + return Status::OK(); + } + InstrumentedMutexLock lock_guard(&trace_writer_mutex_); + if (!writer_.load()) { + return Status::OK(); + } + return writer_.load()->WriteBlockAccess(record, block_key, cf_name, + referenced_key); +} + +uint64_t BlockCacheTracer::NextGetId() { + if (!writer_.load(std::memory_order_relaxed)) { + return BlockCacheTraceHelper::kReservedGetId; + } + uint64_t prev_value = get_id_counter_.fetch_add(1); + if (prev_value == BlockCacheTraceHelper::kReservedGetId) { + // fetch and add again. + return get_id_counter_.fetch_add(1); + } + return prev_value; +} + +} // namespace ROCKSDB_NAMESPACE diff --git a/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.h b/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.h new file mode 100644 index 000000000..9dc62b7fb --- /dev/null +++ b/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer.h @@ -0,0 +1,294 @@ +// 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 +#include + +#include "monitoring/instrumented_mutex.h" +#include "rocksdb/env.h" +#include "rocksdb/options.h" +#include "rocksdb/trace_reader_writer.h" +#include "table/table_reader_caller.h" +#include "trace_replay/trace_replay.h" + +namespace ROCKSDB_NAMESPACE { + +extern const uint64_t kMicrosInSecond; +extern const uint64_t kSecondInMinute; +extern const uint64_t kSecondInHour; + +struct BlockCacheTraceRecord; + +class BlockCacheTraceHelper { + public: + static bool IsGetOrMultiGetOnDataBlock(TraceType block_type, + TableReaderCaller caller); + static bool IsGetOrMultiGet(TableReaderCaller caller); + static bool IsUserAccess(TableReaderCaller caller); + // Row key is a concatenation of the access's fd_number and the referenced + // user key. + static std::string ComputeRowKey(const BlockCacheTraceRecord& access); + // The first four bytes of the referenced key in a Get request is the table + // id. + static uint64_t GetTableId(const BlockCacheTraceRecord& access); + // The sequence number of a get request is the last part of the referenced + // key. + static uint64_t GetSequenceNumber(const BlockCacheTraceRecord& access); + // Block offset in a file is the last varint64 in the block key. + static uint64_t GetBlockOffsetInFile(const BlockCacheTraceRecord& access); + + static const std::string kUnknownColumnFamilyName; + static const uint64_t kReservedGetId; +}; + +// Lookup context for tracing block cache accesses. +// We trace block accesses at five places: +// 1. BlockBasedTable::GetFilter +// 2. BlockBasedTable::GetUncompressedDict. +// 3. BlockBasedTable::MaybeReadAndLoadToCache. (To trace access on data, index, +// and range deletion block.) +// 4. BlockBasedTable::Get. (To trace the referenced key and whether the +// referenced key exists in a fetched data block.) +// 5. BlockBasedTable::MultiGet. (To trace the referenced key and whether the +// referenced key exists in a fetched data block.) +// The context is created at: +// 1. BlockBasedTable::Get. (kUserGet) +// 2. BlockBasedTable::MultiGet. (kUserMGet) +// 3. BlockBasedTable::NewIterator. (either kUserIterator, kCompaction, or +// external SST ingestion calls this function.) +// 4. BlockBasedTable::Open. (kPrefetch) +// 5. Index/Filter::CacheDependencies. (kPrefetch) +// 6. BlockBasedTable::ApproximateOffsetOf. (kCompaction or +// kUserApproximateSize). +struct BlockCacheLookupContext { + BlockCacheLookupContext(const TableReaderCaller& _caller) : caller(_caller) {} + BlockCacheLookupContext(const TableReaderCaller& _caller, uint64_t _get_id, + bool _get_from_user_specified_snapshot) + : caller(_caller), + get_id(_get_id), + get_from_user_specified_snapshot(_get_from_user_specified_snapshot) {} + const TableReaderCaller caller; + // These are populated when we perform lookup/insert on block cache. The block + // cache tracer uses these inforation when logging the block access at + // BlockBasedTable::GET and BlockBasedTable::MultiGet. + bool is_cache_hit = false; + bool no_insert = false; + TraceType block_type = TraceType::kTraceMax; + uint64_t block_size = 0; + std::string block_key; + uint64_t num_keys_in_block = 0; + // The unique id associated with Get and MultiGet. This enables us to track + // how many blocks a Get/MultiGet request accesses. We can also measure the + // impact of row cache vs block cache. + uint64_t get_id = 0; + std::string referenced_key; + bool get_from_user_specified_snapshot = false; + + void FillLookupContext(bool _is_cache_hit, bool _no_insert, + TraceType _block_type, uint64_t _block_size, + const std::string& _block_key, + uint64_t _num_keys_in_block) { + is_cache_hit = _is_cache_hit; + no_insert = _no_insert; + block_type = _block_type; + block_size = _block_size; + block_key = _block_key; + num_keys_in_block = _num_keys_in_block; + } +}; + +enum Boolean : char { kTrue = 1, kFalse = 0 }; + +struct BlockCacheTraceRecord { + // Required fields for all accesses. + uint64_t access_timestamp = 0; + std::string block_key; + TraceType block_type = TraceType::kTraceMax; + uint64_t block_size = 0; + uint64_t cf_id = 0; + std::string cf_name; + uint32_t level = 0; + uint64_t sst_fd_number = 0; + TableReaderCaller caller = TableReaderCaller::kMaxBlockCacheLookupCaller; + Boolean is_cache_hit = Boolean::kFalse; + Boolean no_insert = Boolean::kFalse; + // Required field for Get and MultiGet + uint64_t get_id = BlockCacheTraceHelper::kReservedGetId; + Boolean get_from_user_specified_snapshot = Boolean::kFalse; + std::string referenced_key; + // Required fields for data block and user Get/Multi-Get only. + uint64_t referenced_data_size = 0; + uint64_t num_keys_in_block = 0; + Boolean referenced_key_exist_in_block = Boolean::kFalse; + + BlockCacheTraceRecord() {} + + BlockCacheTraceRecord( + uint64_t _access_timestamp, std::string _block_key, TraceType _block_type, + uint64_t _block_size, uint64_t _cf_id, std::string _cf_name, + uint32_t _level, uint64_t _sst_fd_number, TableReaderCaller _caller, + bool _is_cache_hit, bool _no_insert, + uint64_t _get_id = BlockCacheTraceHelper::kReservedGetId, + bool _get_from_user_specified_snapshot = false, + std::string _referenced_key = "", uint64_t _referenced_data_size = 0, + uint64_t _num_keys_in_block = 0, + bool _referenced_key_exist_in_block = false) + : access_timestamp(_access_timestamp), + block_key(_block_key), + block_type(_block_type), + block_size(_block_size), + cf_id(_cf_id), + cf_name(_cf_name), + level(_level), + sst_fd_number(_sst_fd_number), + caller(_caller), + is_cache_hit(_is_cache_hit ? Boolean::kTrue : Boolean::kFalse), + no_insert(_no_insert ? Boolean::kTrue : Boolean::kFalse), + get_id(_get_id), + get_from_user_specified_snapshot(_get_from_user_specified_snapshot + ? Boolean::kTrue + : Boolean::kFalse), + referenced_key(_referenced_key), + referenced_data_size(_referenced_data_size), + num_keys_in_block(_num_keys_in_block), + referenced_key_exist_in_block( + _referenced_key_exist_in_block ? Boolean::kTrue : Boolean::kFalse) { + } +}; + +struct BlockCacheTraceHeader { + uint64_t start_time; + uint32_t rocksdb_major_version; + uint32_t rocksdb_minor_version; +}; + +// BlockCacheTraceWriter captures all RocksDB block cache accesses using a +// user-provided TraceWriter. Every RocksDB operation is written as a single +// trace. Each trace will have a timestamp and type, followed by the trace +// payload. +class BlockCacheTraceWriter { + public: + BlockCacheTraceWriter(Env* env, const TraceOptions& trace_options, + std::unique_ptr&& trace_writer); + ~BlockCacheTraceWriter() = default; + // No copy and move. + BlockCacheTraceWriter(const BlockCacheTraceWriter&) = delete; + BlockCacheTraceWriter& operator=(const BlockCacheTraceWriter&) = delete; + BlockCacheTraceWriter(BlockCacheTraceWriter&&) = delete; + BlockCacheTraceWriter& operator=(BlockCacheTraceWriter&&) = delete; + + // Pass Slice references to avoid copy. + Status WriteBlockAccess(const BlockCacheTraceRecord& record, + const Slice& block_key, const Slice& cf_name, + const Slice& referenced_key); + + // Write a trace header at the beginning, typically on initiating a trace, + // with some metadata like a magic number and RocksDB version. + Status WriteHeader(); + + private: + Env* env_; + TraceOptions trace_options_; + std::unique_ptr trace_writer_; +}; + +// Write a trace record in human readable format, see +// https://github.com/facebook/rocksdb/wiki/Block-cache-analysis-and-simulation-tools#trace-format +// for details. +class BlockCacheHumanReadableTraceWriter { + public: + ~BlockCacheHumanReadableTraceWriter(); + + Status NewWritableFile(const std::string& human_readable_trace_file_path, + ROCKSDB_NAMESPACE::Env* env); + + Status WriteHumanReadableTraceRecord(const BlockCacheTraceRecord& access, + uint64_t block_id, uint64_t get_key_id); + + private: + char trace_record_buffer_[1024 * 1024]; + std::unique_ptr + human_readable_trace_file_writer_; +}; + +// BlockCacheTraceReader helps read the trace file generated by +// BlockCacheTraceWriter using a user provided TraceReader. +class BlockCacheTraceReader { + public: + BlockCacheTraceReader(std::unique_ptr&& reader); + virtual ~BlockCacheTraceReader() = default; + // No copy and move. + BlockCacheTraceReader(const BlockCacheTraceReader&) = delete; + BlockCacheTraceReader& operator=(const BlockCacheTraceReader&) = delete; + BlockCacheTraceReader(BlockCacheTraceReader&&) = delete; + BlockCacheTraceReader& operator=(BlockCacheTraceReader&&) = delete; + + Status ReadHeader(BlockCacheTraceHeader* header); + + Status ReadAccess(BlockCacheTraceRecord* record); + + private: + std::unique_ptr trace_reader_; +}; + +// Read a trace record in human readable format, see +// https://github.com/facebook/rocksdb/wiki/Block-cache-analysis-and-simulation-tools#trace-format +// for detailed. +class BlockCacheHumanReadableTraceReader : public BlockCacheTraceReader { + public: + BlockCacheHumanReadableTraceReader(const std::string& trace_file_path); + + ~BlockCacheHumanReadableTraceReader(); + + Status ReadHeader(BlockCacheTraceHeader* header); + + Status ReadAccess(BlockCacheTraceRecord* record); + + private: + std::ifstream human_readable_trace_reader_; +}; + +// A block cache tracer. It downsamples the accesses according to +// trace_options and uses BlockCacheTraceWriter to write the access record to +// the trace file. +class BlockCacheTracer { + public: + BlockCacheTracer(); + ~BlockCacheTracer(); + // No copy and move. + BlockCacheTracer(const BlockCacheTracer&) = delete; + BlockCacheTracer& operator=(const BlockCacheTracer&) = delete; + BlockCacheTracer(BlockCacheTracer&&) = delete; + BlockCacheTracer& operator=(BlockCacheTracer&&) = delete; + + // Start writing block cache accesses to the trace_writer. + Status StartTrace(Env* env, const TraceOptions& trace_options, + std::unique_ptr&& trace_writer); + + // Stop writing block cache accesses to the trace_writer. + void EndTrace(); + + bool is_tracing_enabled() const { + return writer_.load(std::memory_order_relaxed); + } + + Status WriteBlockAccess(const BlockCacheTraceRecord& record, + const Slice& block_key, const Slice& cf_name, + const Slice& referenced_key); + + // GetId cycles from 1 to port::kMaxUint64. + uint64_t NextGetId(); + + private: + TraceOptions trace_options_; + // A mutex protects the writer_. + InstrumentedMutex trace_writer_mutex_; + std::atomic writer_; + std::atomic get_id_counter_; +}; + +} // namespace ROCKSDB_NAMESPACE diff --git a/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer_test.cc b/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer_test.cc new file mode 100644 index 000000000..b29600890 --- /dev/null +++ b/storage/rocksdb/rocksdb/trace_replay/block_cache_tracer_test.cc @@ -0,0 +1,378 @@ +// 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/block_cache_tracer.h" +#include "rocksdb/env.h" +#include "rocksdb/status.h" +#include "rocksdb/trace_reader_writer.h" +#include "test_util/testharness.h" +#include "test_util/testutil.h" + +namespace ROCKSDB_NAMESPACE { + +namespace { +const uint64_t kBlockSize = 1024; +const std::string kBlockKeyPrefix = "test-block-"; +const uint32_t kCFId = 0; +const uint32_t kLevel = 1; +const uint64_t kSSTFDNumber = 100; +const std::string kRefKeyPrefix = "test-get-"; +const uint64_t kNumKeysInBlock = 1024; +const uint64_t kReferencedDataSize = 10; +} // namespace + +class BlockCacheTracerTest : public testing::Test { + public: + BlockCacheTracerTest() { + test_path_ = test::PerThreadDBPath("block_cache_tracer_test"); + env_ = ROCKSDB_NAMESPACE::Env::Default(); + EXPECT_OK(env_->CreateDir(test_path_)); + trace_file_path_ = test_path_ + "/block_cache_trace"; + } + + ~BlockCacheTracerTest() override { + EXPECT_OK(env_->DeleteFile(trace_file_path_)); + EXPECT_OK(env_->DeleteDir(test_path_)); + } + + TableReaderCaller GetCaller(uint32_t key_id) { + uint32_t n = key_id % 5; + switch (n) { + case 0: + return TableReaderCaller::kPrefetch; + case 1: + return TableReaderCaller::kCompaction; + case 2: + return TableReaderCaller::kUserGet; + case 3: + return TableReaderCaller::kUserMultiGet; + case 4: + return TableReaderCaller::kUserIterator; + } + assert(false); + } + + void WriteBlockAccess(BlockCacheTraceWriter* writer, uint32_t from_key_id, + TraceType block_type, uint32_t nblocks) { + assert(writer); + for (uint32_t i = 0; i < nblocks; i++) { + uint32_t key_id = from_key_id + i; + BlockCacheTraceRecord record; + record.block_type = block_type; + record.block_size = kBlockSize + key_id; + record.block_key = (kBlockKeyPrefix + std::to_string(key_id)); + record.access_timestamp = env_->NowMicros(); + record.cf_id = kCFId; + record.cf_name = kDefaultColumnFamilyName; + record.caller = GetCaller(key_id); + record.level = kLevel; + record.sst_fd_number = kSSTFDNumber + key_id; + record.is_cache_hit = Boolean::kFalse; + record.no_insert = Boolean::kFalse; + // Provide get_id for all callers. The writer should only write get_id + // when the caller is either GET or MGET. + record.get_id = key_id + 1; + record.get_from_user_specified_snapshot = Boolean::kTrue; + // Provide these fields for all block types. + // The writer should only write these fields for data blocks and the + // caller is either GET or MGET. + record.referenced_key = (kRefKeyPrefix + std::to_string(key_id)); + record.referenced_key_exist_in_block = Boolean::kTrue; + record.num_keys_in_block = kNumKeysInBlock; + record.referenced_data_size = kReferencedDataSize + key_id; + ASSERT_OK(writer->WriteBlockAccess( + record, record.block_key, record.cf_name, record.referenced_key)); + } + } + + BlockCacheTraceRecord GenerateAccessRecord() { + uint32_t key_id = 0; + BlockCacheTraceRecord record; + record.block_type = TraceType::kBlockTraceDataBlock; + record.block_size = kBlockSize; + record.block_key = kBlockKeyPrefix + std::to_string(key_id); + record.access_timestamp = env_->NowMicros(); + record.cf_id = kCFId; + record.cf_name = kDefaultColumnFamilyName; + record.caller = GetCaller(key_id); + record.level = kLevel; + record.sst_fd_number = kSSTFDNumber + key_id; + record.is_cache_hit = Boolean::kFalse; + record.no_insert = Boolean::kFalse; + record.referenced_key = kRefKeyPrefix + std::to_string(key_id); + record.referenced_key_exist_in_block = Boolean::kTrue; + record.num_keys_in_block = kNumKeysInBlock; + return record; + } + + void VerifyAccess(BlockCacheTraceReader* reader, uint32_t from_key_id, + TraceType block_type, uint32_t nblocks) { + assert(reader); + for (uint32_t i = 0; i < nblocks; i++) { + uint32_t key_id = from_key_id + i; + BlockCacheTraceRecord record; + ASSERT_OK(reader->ReadAccess(&record)); + ASSERT_EQ(block_type, record.block_type); + ASSERT_EQ(kBlockSize + key_id, record.block_size); + ASSERT_EQ(kBlockKeyPrefix + std::to_string(key_id), record.block_key); + ASSERT_EQ(kCFId, record.cf_id); + ASSERT_EQ(kDefaultColumnFamilyName, record.cf_name); + ASSERT_EQ(GetCaller(key_id), record.caller); + ASSERT_EQ(kLevel, record.level); + ASSERT_EQ(kSSTFDNumber + key_id, record.sst_fd_number); + ASSERT_EQ(Boolean::kFalse, record.is_cache_hit); + ASSERT_EQ(Boolean::kFalse, record.no_insert); + if (record.caller == TableReaderCaller::kUserGet || + record.caller == TableReaderCaller::kUserMultiGet) { + ASSERT_EQ(key_id + 1, record.get_id); + ASSERT_EQ(Boolean::kTrue, record.get_from_user_specified_snapshot); + ASSERT_EQ(kRefKeyPrefix + std::to_string(key_id), + record.referenced_key); + } else { + ASSERT_EQ(BlockCacheTraceHelper::kReservedGetId, record.get_id); + ASSERT_EQ(Boolean::kFalse, record.get_from_user_specified_snapshot); + ASSERT_EQ("", record.referenced_key); + } + if (block_type == TraceType::kBlockTraceDataBlock && + (record.caller == TableReaderCaller::kUserGet || + record.caller == TableReaderCaller::kUserMultiGet)) { + ASSERT_EQ(Boolean::kTrue, record.referenced_key_exist_in_block); + ASSERT_EQ(kNumKeysInBlock, record.num_keys_in_block); + ASSERT_EQ(kReferencedDataSize + key_id, record.referenced_data_size); + continue; + } + ASSERT_EQ(Boolean::kFalse, record.referenced_key_exist_in_block); + ASSERT_EQ(0, record.num_keys_in_block); + ASSERT_EQ(0, record.referenced_data_size); + } + } + + Env* env_; + EnvOptions env_options_; + std::string trace_file_path_; + std::string test_path_; +}; + +TEST_F(BlockCacheTracerTest, AtomicWriteBeforeStartTrace) { + BlockCacheTraceRecord record = GenerateAccessRecord(); + { + std::unique_ptr trace_writer; + ASSERT_OK(NewFileTraceWriter(env_, env_options_, trace_file_path_, + &trace_writer)); + BlockCacheTracer writer; + // The record should be written to the trace_file since StartTrace is not + // called. + ASSERT_OK(writer.WriteBlockAccess(record, record.block_key, record.cf_name, + record.referenced_key)); + ASSERT_OK(env_->FileExists(trace_file_path_)); + } + { + // Verify trace file contains nothing. + std::unique_ptr trace_reader; + ASSERT_OK(NewFileTraceReader(env_, env_options_, trace_file_path_, + &trace_reader)); + BlockCacheTraceReader reader(std::move(trace_reader)); + BlockCacheTraceHeader header; + ASSERT_NOK(reader.ReadHeader(&header)); + } +} + +TEST_F(BlockCacheTracerTest, AtomicWrite) { + BlockCacheTraceRecord record = GenerateAccessRecord(); + { + TraceOptions trace_opt; + std::unique_ptr trace_writer; + ASSERT_OK(NewFileTraceWriter(env_, env_options_, trace_file_path_, + &trace_writer)); + BlockCacheTracer writer; + ASSERT_OK(writer.StartTrace(env_, trace_opt, std::move(trace_writer))); + ASSERT_OK(writer.WriteBlockAccess(record, record.block_key, record.cf_name, + record.referenced_key)); + ASSERT_OK(env_->FileExists(trace_file_path_)); + } + { + // Verify trace file contains one record. + std::unique_ptr trace_reader; + ASSERT_OK(NewFileTraceReader(env_, env_options_, trace_file_path_, + &trace_reader)); + BlockCacheTraceReader reader(std::move(trace_reader)); + BlockCacheTraceHeader header; + ASSERT_OK(reader.ReadHeader(&header)); + ASSERT_EQ(kMajorVersion, header.rocksdb_major_version); + ASSERT_EQ(kMinorVersion, header.rocksdb_minor_version); + VerifyAccess(&reader, 0, TraceType::kBlockTraceDataBlock, 1); + ASSERT_NOK(reader.ReadAccess(&record)); + } +} + +TEST_F(BlockCacheTracerTest, ConsecutiveStartTrace) { + TraceOptions trace_opt; + std::unique_ptr trace_writer; + ASSERT_OK( + NewFileTraceWriter(env_, env_options_, trace_file_path_, &trace_writer)); + BlockCacheTracer writer; + ASSERT_OK(writer.StartTrace(env_, trace_opt, std::move(trace_writer))); + ASSERT_NOK(writer.StartTrace(env_, trace_opt, std::move(trace_writer))); + ASSERT_OK(env_->FileExists(trace_file_path_)); +} + +TEST_F(BlockCacheTracerTest, AtomicNoWriteAfterEndTrace) { + BlockCacheTraceRecord record = GenerateAccessRecord(); + { + TraceOptions trace_opt; + std::unique_ptr trace_writer; + ASSERT_OK(NewFileTraceWriter(env_, env_options_, trace_file_path_, + &trace_writer)); + BlockCacheTracer writer; + ASSERT_OK(writer.StartTrace(env_, trace_opt, std::move(trace_writer))); + ASSERT_OK(writer.WriteBlockAccess(record, record.block_key, record.cf_name, + record.referenced_key)); + writer.EndTrace(); + // Write the record again. This time the record should not be written since + // EndTrace is called. + ASSERT_OK(writer.WriteBlockAccess(record, record.block_key, record.cf_name, + record.referenced_key)); + ASSERT_OK(env_->FileExists(trace_file_path_)); + } + { + // Verify trace file contains one record. + std::unique_ptr trace_reader; + ASSERT_OK(NewFileTraceReader(env_, env_options_, trace_file_path_, + &trace_reader)); + BlockCacheTraceReader reader(std::move(trace_reader)); + BlockCacheTraceHeader header; + ASSERT_OK(reader.ReadHeader(&header)); + ASSERT_EQ(kMajorVersion, header.rocksdb_major_version); + ASSERT_EQ(kMinorVersion, header.rocksdb_minor_version); + VerifyAccess(&reader, 0, TraceType::kBlockTraceDataBlock, 1); + ASSERT_NOK(reader.ReadAccess(&record)); + } +} + +TEST_F(BlockCacheTracerTest, NextGetId) { + BlockCacheTracer writer; + { + TraceOptions trace_opt; + std::unique_ptr trace_writer; + ASSERT_OK(NewFileTraceWriter(env_, env_options_, trace_file_path_, + &trace_writer)); + // next get id should always return 0 before we call StartTrace. + ASSERT_EQ(0, writer.NextGetId()); + ASSERT_EQ(0, writer.NextGetId()); + ASSERT_OK(writer.StartTrace(env_, trace_opt, std::move(trace_writer))); + ASSERT_EQ(1, writer.NextGetId()); + ASSERT_EQ(2, writer.NextGetId()); + writer.EndTrace(); + // next get id should return 0. + ASSERT_EQ(0, writer.NextGetId()); + } + + // Start trace again and next get id should return 1. + { + TraceOptions trace_opt; + std::unique_ptr trace_writer; + ASSERT_OK(NewFileTraceWriter(env_, env_options_, trace_file_path_, + &trace_writer)); + ASSERT_OK(writer.StartTrace(env_, trace_opt, std::move(trace_writer))); + ASSERT_EQ(1, writer.NextGetId()); + } +} + +TEST_F(BlockCacheTracerTest, MixedBlocks) { + { + // Generate a trace file containing a mix of blocks. + TraceOptions trace_opt; + std::unique_ptr trace_writer; + ASSERT_OK(NewFileTraceWriter(env_, env_options_, trace_file_path_, + &trace_writer)); + BlockCacheTraceWriter writer(env_, trace_opt, std::move(trace_writer)); + ASSERT_OK(writer.WriteHeader()); + // Write blocks of different types. + WriteBlockAccess(&writer, 0, TraceType::kBlockTraceUncompressionDictBlock, + 10); + WriteBlockAccess(&writer, 10, TraceType::kBlockTraceDataBlock, 10); + WriteBlockAccess(&writer, 20, TraceType::kBlockTraceFilterBlock, 10); + WriteBlockAccess(&writer, 30, TraceType::kBlockTraceIndexBlock, 10); + WriteBlockAccess(&writer, 40, TraceType::kBlockTraceRangeDeletionBlock, 10); + ASSERT_OK(env_->FileExists(trace_file_path_)); + } + + { + // Verify trace file is generated correctly. + std::unique_ptr trace_reader; + ASSERT_OK(NewFileTraceReader(env_, env_options_, trace_file_path_, + &trace_reader)); + BlockCacheTraceReader reader(std::move(trace_reader)); + BlockCacheTraceHeader header; + ASSERT_OK(reader.ReadHeader(&header)); + ASSERT_EQ(kMajorVersion, header.rocksdb_major_version); + ASSERT_EQ(kMinorVersion, header.rocksdb_minor_version); + // Read blocks. + VerifyAccess(&reader, 0, TraceType::kBlockTraceUncompressionDictBlock, 10); + VerifyAccess(&reader, 10, TraceType::kBlockTraceDataBlock, 10); + VerifyAccess(&reader, 20, TraceType::kBlockTraceFilterBlock, 10); + VerifyAccess(&reader, 30, TraceType::kBlockTraceIndexBlock, 10); + VerifyAccess(&reader, 40, TraceType::kBlockTraceRangeDeletionBlock, 10); + // Read one more record should report an error. + BlockCacheTraceRecord record; + ASSERT_NOK(reader.ReadAccess(&record)); + } +} + +TEST_F(BlockCacheTracerTest, HumanReadableTrace) { + BlockCacheTraceRecord record = GenerateAccessRecord(); + record.get_id = 1; + record.referenced_key = ""; + record.caller = TableReaderCaller::kUserGet; + record.get_from_user_specified_snapshot = Boolean::kTrue; + record.referenced_data_size = kReferencedDataSize; + PutFixed32(&record.referenced_key, 111); + PutLengthPrefixedSlice(&record.referenced_key, "get_key"); + PutFixed64(&record.referenced_key, 2 << 8); + PutLengthPrefixedSlice(&record.block_key, "block_key"); + PutVarint64(&record.block_key, 333); + { + // Generate a human readable trace file. + BlockCacheHumanReadableTraceWriter writer; + ASSERT_OK(writer.NewWritableFile(trace_file_path_, env_)); + ASSERT_OK(writer.WriteHumanReadableTraceRecord(record, 1, 1)); + ASSERT_OK(env_->FileExists(trace_file_path_)); + } + { + BlockCacheHumanReadableTraceReader reader(trace_file_path_); + BlockCacheTraceHeader header; + BlockCacheTraceRecord read_record; + ASSERT_OK(reader.ReadHeader(&header)); + ASSERT_OK(reader.ReadAccess(&read_record)); + ASSERT_EQ(TraceType::kBlockTraceDataBlock, read_record.block_type); + ASSERT_EQ(kBlockSize, read_record.block_size); + ASSERT_EQ(kCFId, read_record.cf_id); + ASSERT_EQ(kDefaultColumnFamilyName, read_record.cf_name); + ASSERT_EQ(TableReaderCaller::kUserGet, read_record.caller); + ASSERT_EQ(kLevel, read_record.level); + ASSERT_EQ(kSSTFDNumber, read_record.sst_fd_number); + ASSERT_EQ(Boolean::kFalse, read_record.is_cache_hit); + ASSERT_EQ(Boolean::kFalse, read_record.no_insert); + ASSERT_EQ(1, read_record.get_id); + ASSERT_EQ(Boolean::kTrue, read_record.get_from_user_specified_snapshot); + ASSERT_EQ(Boolean::kTrue, read_record.referenced_key_exist_in_block); + ASSERT_EQ(kNumKeysInBlock, read_record.num_keys_in_block); + ASSERT_EQ(kReferencedDataSize, read_record.referenced_data_size); + ASSERT_EQ(record.block_key.size(), read_record.block_key.size()); + ASSERT_EQ(record.referenced_key.size(), record.referenced_key.size()); + ASSERT_EQ(112, BlockCacheTraceHelper::GetTableId(read_record)); + ASSERT_EQ(3, BlockCacheTraceHelper::GetSequenceNumber(read_record)); + ASSERT_EQ(333, BlockCacheTraceHelper::GetBlockOffsetInFile(read_record)); + // Read again should fail. + ASSERT_NOK(reader.ReadAccess(&read_record)); + } +} + +} // namespace ROCKSDB_NAMESPACE + +int main(int argc, char** argv) { + ::testing::InitGoogleTest(&argc, argv); + return RUN_ALL_TESTS(); +} -- Gitee