62829ff751
Summary: in order to avoid reallocations for a scratch std::string on every call to Next(). Pull Request resolved: https://github.com/facebook/rocksdb/pull/5702 Differential Revision: D16867803 fbshipit-source-id: 1391220a1b172b23336bbc71dc0c79ccf3b1c701
128 lines
4.3 KiB
C++
128 lines
4.3 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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#pragma once
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#ifndef ROCKSDB_LITE
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#include <vector>
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#include "db/log_reader.h"
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#include "db/version_set.h"
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#include "file/filename.h"
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#include "options/db_options.h"
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#include "port/port.h"
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#include "rocksdb/env.h"
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#include "rocksdb/options.h"
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#include "rocksdb/transaction_log.h"
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#include "rocksdb/types.h"
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namespace rocksdb {
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class LogFileImpl : public LogFile {
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public:
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LogFileImpl(uint64_t logNum, WalFileType logType, SequenceNumber startSeq,
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uint64_t sizeBytes) :
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logNumber_(logNum),
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type_(logType),
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startSequence_(startSeq),
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sizeFileBytes_(sizeBytes) {
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}
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std::string PathName() const override {
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if (type_ == kArchivedLogFile) {
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return ArchivedLogFileName("", logNumber_);
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}
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return LogFileName("", logNumber_);
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}
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uint64_t LogNumber() const override { return logNumber_; }
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WalFileType Type() const override { return type_; }
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SequenceNumber StartSequence() const override { return startSequence_; }
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uint64_t SizeFileBytes() const override { return sizeFileBytes_; }
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bool operator < (const LogFile& that) const {
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return LogNumber() < that.LogNumber();
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}
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private:
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uint64_t logNumber_;
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WalFileType type_;
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SequenceNumber startSequence_;
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uint64_t sizeFileBytes_;
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};
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class TransactionLogIteratorImpl : public TransactionLogIterator {
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public:
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TransactionLogIteratorImpl(
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const std::string& dir, const ImmutableDBOptions* options,
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const TransactionLogIterator::ReadOptions& read_options,
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const EnvOptions& soptions, const SequenceNumber seqNum,
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std::unique_ptr<VectorLogPtr> files, VersionSet const* const versions,
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const bool seq_per_batch);
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virtual bool Valid() override;
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virtual void Next() override;
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virtual Status status() override;
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virtual BatchResult GetBatch() override;
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private:
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const std::string& dir_;
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const ImmutableDBOptions* options_;
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const TransactionLogIterator::ReadOptions read_options_;
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const EnvOptions& soptions_;
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SequenceNumber starting_sequence_number_;
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std::unique_ptr<VectorLogPtr> files_;
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bool started_;
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bool is_valid_; // not valid when it starts of.
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Status current_status_;
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size_t current_file_index_;
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std::unique_ptr<WriteBatch> current_batch_;
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std::unique_ptr<log::Reader> current_log_reader_;
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std::string scratch_;
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Status OpenLogFile(const LogFile* log_file,
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std::unique_ptr<SequentialFileReader>* file);
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struct LogReporter : public log::Reader::Reporter {
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Env* env;
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Logger* info_log;
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virtual void Corruption(size_t bytes, const Status& s) override {
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ROCKS_LOG_ERROR(info_log, "dropping %" ROCKSDB_PRIszt " bytes; %s", bytes,
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s.ToString().c_str());
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}
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virtual void Info(const char* s) { ROCKS_LOG_INFO(info_log, "%s", s); }
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} reporter_;
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SequenceNumber
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current_batch_seq_; // sequence number at start of current batch
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SequenceNumber current_last_seq_; // last sequence in the current batch
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// Used only to get latest seq. num
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// TODO(icanadi) can this be just a callback?
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VersionSet const* const versions_;
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const bool seq_per_batch_;
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// Reads from transaction log only if the writebatch record has been written
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bool RestrictedRead(Slice* record);
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// Seeks to startingSequenceNumber reading from startFileIndex in files_.
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// If strict is set,then must get a batch starting with startingSequenceNumber
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void SeekToStartSequence(uint64_t start_file_index = 0, bool strict = false);
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// Implementation of Next. SeekToStartSequence calls it internally with
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// internal=true to let it find next entry even if it has to jump gaps because
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// the iterator may start off from the first available entry but promises to
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// be continuous after that
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void NextImpl(bool internal = false);
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// Check if batch is expected, else return false
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bool IsBatchExpected(const WriteBatch* batch, SequenceNumber expected_seq);
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// Update current batch if a continuous batch is found, else return false
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void UpdateCurrentWriteBatch(const Slice& record);
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Status OpenLogReader(const LogFile* file);
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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