fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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497 lines
18 KiB
497 lines
18 KiB
// 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 <cinttypes>
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#include <cstdio>
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#include <cstdlib>
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#include "db/db_impl/db_impl.h"
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#include "db/dbformat.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/trace_record.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_NAMESPACE {
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namespace {
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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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return 0 == GetSliceRangedNPHash(block_key, trace_options.sampling_frequency);
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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::IsGetOrMultiGetOnDataBlock(
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TraceType block_type, TableReaderCaller caller) {
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return (block_type == TraceType::kBlockTraceDataBlock) &&
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IsGetOrMultiGet(caller);
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}
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bool BlockCacheTraceHelper::IsGetOrMultiGet(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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std::string BlockCacheTraceHelper::ComputeRowKey(
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const BlockCacheTraceRecord& access) {
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if (!IsGetOrMultiGet(access.caller)) {
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return "";
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}
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Slice key = ExtractUserKey(access.referenced_key);
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return std::to_string(access.sst_fd_number) + "_" + key.ToString();
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}
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uint64_t BlockCacheTraceHelper::GetTableId(
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const BlockCacheTraceRecord& access) {
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if (!IsGetOrMultiGet(access.caller) || access.referenced_key.size() < 4) {
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return 0;
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}
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return static_cast<uint64_t>(DecodeFixed32(access.referenced_key.data())) + 1;
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}
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uint64_t BlockCacheTraceHelper::GetSequenceNumber(
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const BlockCacheTraceRecord& access) {
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if (!IsGetOrMultiGet(access.caller)) {
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return 0;
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}
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return access.get_from_user_specified_snapshot == Boolean::kFalse
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? 0
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: 1 + GetInternalKeySeqno(access.referenced_key);
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}
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uint64_t BlockCacheTraceHelper::GetBlockOffsetInFile(
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const BlockCacheTraceRecord& access) {
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Slice input(access.block_key);
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uint64_t offset = 0;
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while (true) {
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uint64_t tmp = 0;
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if (GetVarint64(&input, &tmp)) {
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offset = tmp;
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} else {
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break;
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}
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}
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return offset;
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}
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BlockCacheTraceWriter::BlockCacheTraceWriter(
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SystemClock* clock, const TraceOptions& trace_options,
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std::unique_ptr<TraceWriter>&& trace_writer)
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: clock_(clock),
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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::IsGetOrMultiGet(record.caller)) {
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PutFixed64(&trace.payload, record.get_id);
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trace.payload.push_back(record.get_from_user_specified_snapshot);
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PutLengthPrefixedSlice(&trace.payload, referenced_key);
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}
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if (BlockCacheTraceHelper::IsGetOrMultiGetOnDataBlock(record.block_type,
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record.caller)) {
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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 = clock_->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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const unsigned int kCharSize = 1;
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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::IsGetOrMultiGet(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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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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"get_from_user_specified_snapshot.");
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}
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record->get_from_user_specified_snapshot =
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static_cast<Boolean>(enc_slice[0]);
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enc_slice.remove_prefix(kCharSize);
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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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}
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if (BlockCacheTraceHelper::IsGetOrMultiGetOnDataBlock(record->block_type,
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record->caller)) {
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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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BlockCacheHumanReadableTraceWriter::~BlockCacheHumanReadableTraceWriter() {
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if (human_readable_trace_file_writer_) {
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human_readable_trace_file_writer_->Flush().PermitUncheckedError();
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human_readable_trace_file_writer_->Close().PermitUncheckedError();
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}
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}
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Status BlockCacheHumanReadableTraceWriter::NewWritableFile(
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const std::string& human_readable_trace_file_path,
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ROCKSDB_NAMESPACE::Env* env) {
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if (human_readable_trace_file_path.empty()) {
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return Status::InvalidArgument(
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"The provided human_readable_trace_file_path is null.");
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}
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return env->NewWritableFile(human_readable_trace_file_path,
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&human_readable_trace_file_writer_, EnvOptions());
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}
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Status BlockCacheHumanReadableTraceWriter::WriteHumanReadableTraceRecord(
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const BlockCacheTraceRecord& access, uint64_t block_id,
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uint64_t get_key_id) {
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if (!human_readable_trace_file_writer_) {
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return Status::OK();
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}
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int ret = snprintf(
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trace_record_buffer_, sizeof(trace_record_buffer_),
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"%" PRIu64 ",%" PRIu64 ",%u,%" PRIu64 ",%" PRIu64 ",%s,%" PRIu32
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",%" PRIu64 ",%u,%u,%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%u,%u,%" PRIu64
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",%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 "\n",
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access.access_timestamp, block_id, access.block_type, access.block_size,
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access.cf_id, access.cf_name.c_str(), access.level, access.sst_fd_number,
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access.caller, access.no_insert, access.get_id, get_key_id,
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access.referenced_data_size, access.is_cache_hit,
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access.referenced_key_exist_in_block, access.num_keys_in_block,
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BlockCacheTraceHelper::GetTableId(access),
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BlockCacheTraceHelper::GetSequenceNumber(access),
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static_cast<uint64_t>(access.block_key.size()),
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static_cast<uint64_t>(access.referenced_key.size()),
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BlockCacheTraceHelper::GetBlockOffsetInFile(access));
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if (ret < 0) {
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return Status::IOError("failed to format the output");
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}
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std::string printout(trace_record_buffer_);
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return human_readable_trace_file_writer_->Append(printout);
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}
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BlockCacheHumanReadableTraceReader::BlockCacheHumanReadableTraceReader(
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const std::string& trace_file_path)
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: BlockCacheTraceReader(/*trace_reader=*/nullptr) {
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human_readable_trace_reader_.open(trace_file_path, std::ifstream::in);
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}
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BlockCacheHumanReadableTraceReader::~BlockCacheHumanReadableTraceReader() {
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human_readable_trace_reader_.close();
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}
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Status BlockCacheHumanReadableTraceReader::ReadHeader(
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BlockCacheTraceHeader* /*header*/) {
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return Status::OK();
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}
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Status BlockCacheHumanReadableTraceReader::ReadAccess(
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BlockCacheTraceRecord* record) {
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std::string line;
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if (!std::getline(human_readable_trace_reader_, line)) {
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return Status::Incomplete("No more records to read.");
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}
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std::stringstream ss(line);
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std::vector<std::string> record_strs;
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while (ss.good()) {
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std::string substr;
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getline(ss, substr, ',');
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record_strs.push_back(substr);
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}
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if (record_strs.size() != 21) {
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return Status::Incomplete("Records format is wrong.");
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}
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record->access_timestamp = ParseUint64(record_strs[0]);
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uint64_t block_key = ParseUint64(record_strs[1]);
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record->block_type = static_cast<TraceType>(ParseUint64(record_strs[2]));
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record->block_size = ParseUint64(record_strs[3]);
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record->cf_id = ParseUint64(record_strs[4]);
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record->cf_name = record_strs[5];
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record->level = static_cast<uint32_t>(ParseUint64(record_strs[6]));
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record->sst_fd_number = ParseUint64(record_strs[7]);
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record->caller = static_cast<TableReaderCaller>(ParseUint64(record_strs[8]));
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record->no_insert = static_cast<Boolean>(ParseUint64(record_strs[9]));
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record->get_id = ParseUint64(record_strs[10]);
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uint64_t get_key_id = ParseUint64(record_strs[11]);
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record->referenced_data_size = ParseUint64(record_strs[12]);
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record->is_cache_hit = static_cast<Boolean>(ParseUint64(record_strs[13]));
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record->referenced_key_exist_in_block =
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static_cast<Boolean>(ParseUint64(record_strs[14]));
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record->num_keys_in_block = ParseUint64(record_strs[15]);
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uint64_t table_id = ParseUint64(record_strs[16]);
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if (table_id > 0) {
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// Decrement since valid table id in the trace file equals traced table id
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// + 1.
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table_id -= 1;
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}
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uint64_t get_sequence_number = ParseUint64(record_strs[17]);
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if (get_sequence_number > 0) {
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record->get_from_user_specified_snapshot = Boolean::kTrue;
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// Decrement since valid seq number in the trace file equals traced seq
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// number + 1.
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get_sequence_number -= 1;
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}
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uint64_t block_key_size = ParseUint64(record_strs[18]);
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uint64_t get_key_size = ParseUint64(record_strs[19]);
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uint64_t block_offset = ParseUint64(record_strs[20]);
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std::string tmp_block_key;
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PutVarint64(&tmp_block_key, block_key);
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PutVarint64(&tmp_block_key, block_offset);
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// Append 1 until the size is the same as traced block key size.
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while (record->block_key.size() < block_key_size - tmp_block_key.size()) {
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record->block_key += "1";
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}
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record->block_key += tmp_block_key;
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if (get_key_id != 0) {
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std::string tmp_get_key;
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PutFixed64(&tmp_get_key, get_key_id);
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PutFixed64(&tmp_get_key, get_sequence_number << 8);
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PutFixed32(&record->referenced_key, static_cast<uint32_t>(table_id));
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// Append 1 until the size is the same as traced key size.
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while (record->referenced_key.size() < get_key_size - tmp_get_key.size()) {
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record->referenced_key += "1";
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}
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record->referenced_key += tmp_get_key;
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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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SystemClock* clock, 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;
|
|
writer_.store(
|
|
new BlockCacheTraceWriter(clock, 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
|
|
|