mirror of https://github.com/facebook/rocksdb.git
307 lines
11 KiB
C++
307 lines
11 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "trace_replay/block_cache_tracer.h"
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#include "db/db_impl/db_impl.h"
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#include "rocksdb/slice.h"
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#include "util/coding.h"
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#include "util/hash.h"
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#include "util/string_util.h"
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namespace rocksdb {
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namespace {
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const unsigned int kCharSize = 1;
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bool ShouldTrace(const Slice& block_key, const TraceOptions& trace_options) {
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if (trace_options.sampling_frequency == 0 ||
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trace_options.sampling_frequency == 1) {
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return true;
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}
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// We use spatial downsampling so that we have a complete access history for a
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// block.
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const uint64_t hash = GetSliceNPHash64(block_key);
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return hash % trace_options.sampling_frequency == 0;
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}
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} // namespace
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const uint64_t kMicrosInSecond = 1000 * 1000;
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const uint64_t kSecondInMinute = 60;
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const uint64_t kSecondInHour = 3600;
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const std::string BlockCacheTraceHelper::kUnknownColumnFamilyName =
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"UnknownColumnFamily";
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const uint64_t BlockCacheTraceHelper::kReservedGetId = 0;
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bool BlockCacheTraceHelper::ShouldTraceReferencedKey(TraceType block_type,
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TableReaderCaller caller) {
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return (block_type == TraceType::kBlockTraceDataBlock) &&
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(caller == TableReaderCaller::kUserGet ||
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caller == TableReaderCaller::kUserMultiGet);
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}
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bool BlockCacheTraceHelper::ShouldTraceGetId(TableReaderCaller caller) {
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return caller == TableReaderCaller::kUserGet ||
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caller == TableReaderCaller::kUserMultiGet;
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}
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bool BlockCacheTraceHelper::IsUserAccess(TableReaderCaller caller) {
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return caller == TableReaderCaller::kUserGet ||
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caller == TableReaderCaller::kUserMultiGet ||
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caller == TableReaderCaller::kUserIterator ||
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caller == TableReaderCaller::kUserApproximateSize ||
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caller == TableReaderCaller::kUserVerifyChecksum;
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}
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BlockCacheTraceWriter::BlockCacheTraceWriter(
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Env* env, const TraceOptions& trace_options,
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std::unique_ptr<TraceWriter>&& trace_writer)
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: env_(env),
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trace_options_(trace_options),
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trace_writer_(std::move(trace_writer)) {}
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Status BlockCacheTraceWriter::WriteBlockAccess(
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const BlockCacheTraceRecord& record, const Slice& block_key,
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const Slice& cf_name, const Slice& referenced_key) {
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uint64_t trace_file_size = trace_writer_->GetFileSize();
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if (trace_file_size > trace_options_.max_trace_file_size) {
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return Status::OK();
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}
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Trace trace;
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trace.ts = record.access_timestamp;
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trace.type = record.block_type;
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PutLengthPrefixedSlice(&trace.payload, block_key);
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PutFixed64(&trace.payload, record.block_size);
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PutFixed64(&trace.payload, record.cf_id);
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PutLengthPrefixedSlice(&trace.payload, cf_name);
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PutFixed32(&trace.payload, record.level);
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PutFixed64(&trace.payload, record.sst_fd_number);
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trace.payload.push_back(record.caller);
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trace.payload.push_back(record.is_cache_hit);
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trace.payload.push_back(record.no_insert);
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if (BlockCacheTraceHelper::ShouldTraceGetId(record.caller)) {
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PutFixed64(&trace.payload, record.get_id);
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}
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if (BlockCacheTraceHelper::ShouldTraceReferencedKey(record.block_type,
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record.caller)) {
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PutLengthPrefixedSlice(&trace.payload, referenced_key);
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PutFixed64(&trace.payload, record.referenced_data_size);
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PutFixed64(&trace.payload, record.num_keys_in_block);
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trace.payload.push_back(record.referenced_key_exist_in_block);
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}
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std::string encoded_trace;
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TracerHelper::EncodeTrace(trace, &encoded_trace);
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return trace_writer_->Write(encoded_trace);
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}
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Status BlockCacheTraceWriter::WriteHeader() {
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Trace trace;
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trace.ts = env_->NowMicros();
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trace.type = TraceType::kTraceBegin;
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PutLengthPrefixedSlice(&trace.payload, kTraceMagic);
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PutFixed32(&trace.payload, kMajorVersion);
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PutFixed32(&trace.payload, kMinorVersion);
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std::string encoded_trace;
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TracerHelper::EncodeTrace(trace, &encoded_trace);
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return trace_writer_->Write(encoded_trace);
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}
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BlockCacheTraceReader::BlockCacheTraceReader(
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std::unique_ptr<TraceReader>&& reader)
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: trace_reader_(std::move(reader)) {}
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Status BlockCacheTraceReader::ReadHeader(BlockCacheTraceHeader* header) {
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assert(header != nullptr);
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std::string encoded_trace;
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Status s = trace_reader_->Read(&encoded_trace);
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if (!s.ok()) {
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return s;
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}
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Trace trace;
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s = TracerHelper::DecodeTrace(encoded_trace, &trace);
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if (!s.ok()) {
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return s;
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}
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header->start_time = trace.ts;
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Slice enc_slice = Slice(trace.payload);
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Slice magnic_number;
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if (!GetLengthPrefixedSlice(&enc_slice, &magnic_number)) {
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return Status::Corruption(
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"Corrupted header in the trace file: Failed to read the magic number.");
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}
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if (magnic_number.ToString() != kTraceMagic) {
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return Status::Corruption(
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"Corrupted header in the trace file: Magic number does not match.");
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}
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if (!GetFixed32(&enc_slice, &header->rocksdb_major_version)) {
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return Status::Corruption(
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"Corrupted header in the trace file: Failed to read rocksdb major "
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"version number.");
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}
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if (!GetFixed32(&enc_slice, &header->rocksdb_minor_version)) {
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return Status::Corruption(
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"Corrupted header in the trace file: Failed to read rocksdb minor "
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"version number.");
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}
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// We should have retrieved all information in the header.
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if (!enc_slice.empty()) {
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return Status::Corruption(
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"Corrupted header in the trace file: The length of header is too "
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"long.");
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}
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return Status::OK();
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}
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Status BlockCacheTraceReader::ReadAccess(BlockCacheTraceRecord* record) {
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assert(record);
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std::string encoded_trace;
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Status s = trace_reader_->Read(&encoded_trace);
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if (!s.ok()) {
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return s;
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}
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Trace trace;
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s = TracerHelper::DecodeTrace(encoded_trace, &trace);
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if (!s.ok()) {
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return s;
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}
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record->access_timestamp = trace.ts;
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record->block_type = trace.type;
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Slice enc_slice = Slice(trace.payload);
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Slice block_key;
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if (!GetLengthPrefixedSlice(&enc_slice, &block_key)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read block key.");
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}
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record->block_key = block_key.ToString();
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if (!GetFixed64(&enc_slice, &record->block_size)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read block size.");
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}
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if (!GetFixed64(&enc_slice, &record->cf_id)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read column family ID.");
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}
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Slice cf_name;
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if (!GetLengthPrefixedSlice(&enc_slice, &cf_name)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read column family name.");
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}
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record->cf_name = cf_name.ToString();
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if (!GetFixed32(&enc_slice, &record->level)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read level.");
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}
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if (!GetFixed64(&enc_slice, &record->sst_fd_number)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read SST file number.");
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}
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if (enc_slice.empty()) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read caller.");
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}
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record->caller = static_cast<TableReaderCaller>(enc_slice[0]);
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enc_slice.remove_prefix(kCharSize);
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if (enc_slice.empty()) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read is_cache_hit.");
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}
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record->is_cache_hit = static_cast<Boolean>(enc_slice[0]);
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enc_slice.remove_prefix(kCharSize);
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if (enc_slice.empty()) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read no_insert.");
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}
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record->no_insert = static_cast<Boolean>(enc_slice[0]);
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enc_slice.remove_prefix(kCharSize);
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if (BlockCacheTraceHelper::ShouldTraceGetId(record->caller)) {
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if (!GetFixed64(&enc_slice, &record->get_id)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read the get id.");
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}
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}
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if (BlockCacheTraceHelper::ShouldTraceReferencedKey(record->block_type,
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record->caller)) {
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Slice referenced_key;
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if (!GetLengthPrefixedSlice(&enc_slice, &referenced_key)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read the referenced key.");
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}
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record->referenced_key = referenced_key.ToString();
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if (!GetFixed64(&enc_slice, &record->referenced_data_size)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read the referenced data size.");
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}
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if (!GetFixed64(&enc_slice, &record->num_keys_in_block)) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read the number of keys in the "
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"block.");
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}
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if (enc_slice.empty()) {
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return Status::Incomplete(
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"Incomplete access record: Failed to read "
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"referenced_key_exist_in_block.");
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}
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record->referenced_key_exist_in_block = static_cast<Boolean>(enc_slice[0]);
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}
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return Status::OK();
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}
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BlockCacheTracer::BlockCacheTracer() { writer_.store(nullptr); }
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BlockCacheTracer::~BlockCacheTracer() { EndTrace(); }
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Status BlockCacheTracer::StartTrace(
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Env* env, const TraceOptions& trace_options,
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std::unique_ptr<TraceWriter>&& trace_writer) {
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InstrumentedMutexLock lock_guard(&trace_writer_mutex_);
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if (writer_.load()) {
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return Status::Busy();
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}
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get_id_counter_.store(1);
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trace_options_ = trace_options;
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writer_.store(
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new BlockCacheTraceWriter(env, trace_options, std::move(trace_writer)));
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return writer_.load()->WriteHeader();
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}
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void BlockCacheTracer::EndTrace() {
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InstrumentedMutexLock lock_guard(&trace_writer_mutex_);
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if (!writer_.load()) {
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return;
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}
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delete writer_.load();
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writer_.store(nullptr);
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}
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Status BlockCacheTracer::WriteBlockAccess(const BlockCacheTraceRecord& record,
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const Slice& block_key,
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const Slice& cf_name,
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const Slice& referenced_key) {
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if (!writer_.load() || !ShouldTrace(block_key, trace_options_)) {
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return Status::OK();
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}
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InstrumentedMutexLock lock_guard(&trace_writer_mutex_);
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if (!writer_.load()) {
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return Status::OK();
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}
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return writer_.load()->WriteBlockAccess(record, block_key, cf_name,
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referenced_key);
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}
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uint64_t BlockCacheTracer::NextGetId() {
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if (!writer_.load(std::memory_order_relaxed)) {
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return BlockCacheTraceHelper::kReservedGetId;
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}
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uint64_t prev_value = get_id_counter_.fetch_add(1);
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if (prev_value == BlockCacheTraceHelper::kReservedGetId) {
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// fetch and add again.
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return get_id_counter_.fetch_add(1);
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}
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return prev_value;
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}
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} // namespace rocksdb
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