mirror of https://github.com/facebook/rocksdb.git
115 lines
3.8 KiB
C++
115 lines
3.8 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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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <atomic>
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#include <deque>
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#include <limits>
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#include <set>
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#include <utility>
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#include <vector>
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#include <string>
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#include <memory>
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#include "db/version_set.h"
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#include "file/file_util.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/status.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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#ifndef ROCKSDB_LITE
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// WAL manager provides the abstraction for reading the WAL files as a single
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// unit. Internally, it opens and reads the files using Reader or Writer
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// abstraction.
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class WalManager {
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public:
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WalManager(const ImmutableDBOptions& db_options,
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const FileOptions& file_options, const bool seq_per_batch = false)
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: db_options_(db_options),
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file_options_(file_options),
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env_(db_options.env),
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fs_(db_options.fs.get()),
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purge_wal_files_last_run_(0),
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seq_per_batch_(seq_per_batch),
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wal_in_db_path_(IsWalDirSameAsDBPath(&db_options)) {}
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Status GetSortedWalFiles(VectorLogPtr& files);
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// Allow user to tail transaction log to find all recent changes to the
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// database that are newer than `seq_number`.
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Status GetUpdatesSince(
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SequenceNumber seq_number, std::unique_ptr<TransactionLogIterator>* iter,
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const TransactionLogIterator::ReadOptions& read_options,
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VersionSet* version_set);
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void PurgeObsoleteWALFiles();
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void ArchiveWALFile(const std::string& fname, uint64_t number);
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Status DeleteFile(const std::string& fname, uint64_t number);
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Status GetLiveWalFile(uint64_t number, std::unique_ptr<LogFile>* log_file);
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Status TEST_ReadFirstRecord(const WalFileType type, const uint64_t number,
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SequenceNumber* sequence) {
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return ReadFirstRecord(type, number, sequence);
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}
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Status TEST_ReadFirstLine(const std::string& fname, const uint64_t number,
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SequenceNumber* sequence) {
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return ReadFirstLine(fname, number, sequence);
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}
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private:
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Status GetSortedWalsOfType(const std::string& path, VectorLogPtr& log_files,
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WalFileType type);
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// Requires: all_logs should be sorted with earliest log file first
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// Retains all log files in all_logs which contain updates with seq no.
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// Greater Than or Equal to the requested SequenceNumber.
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Status RetainProbableWalFiles(VectorLogPtr& all_logs,
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const SequenceNumber target);
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Status ReadFirstRecord(const WalFileType type, const uint64_t number,
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SequenceNumber* sequence);
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Status ReadFirstLine(const std::string& fname, const uint64_t number,
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SequenceNumber* sequence);
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// ------- state from DBImpl ------
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const ImmutableDBOptions& db_options_;
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const FileOptions file_options_;
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Env* env_;
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FileSystem* fs_;
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// ------- WalManager state -------
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// cache for ReadFirstRecord() calls
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std::unordered_map<uint64_t, SequenceNumber> read_first_record_cache_;
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port::Mutex read_first_record_cache_mutex_;
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// last time when PurgeObsoleteWALFiles ran.
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uint64_t purge_wal_files_last_run_;
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bool seq_per_batch_;
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bool wal_in_db_path_;
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// obsolete files will be deleted every this seconds if ttl deletion is
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// enabled and archive size_limit is disabled.
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static const uint64_t kDefaultIntervalToDeleteObsoleteWAL = 600;
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};
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#endif // ROCKSDB_LITE
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} // namespace rocksdb
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