ab7f7c9e49
Summary: Prior to this change, the "wal_dir" DBOption would always be set (defaults to dbname) when the DBOptions were sanitized. Because of this setitng in the options file, it was not possible to rename/relocate a database directory after it had been created and use the existing options file. After this change, the "wal_dir" option is only set under specific circumstances. Methods were added to the ImmutableDBOptions class to see if it is set and if it is set to something other than the dbname. Additionally, a method was added to retrieve the effective value of the WAL dir (either the option or the dbname/path). Tests were added to the core and ldb to test that a database could be created and renamed without issue. Additional tests for various permutations of wal_dir were also added. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8582 Reviewed By: pdillinger, autopear Differential Revision: D29881122 Pulled By: mrambacher fbshipit-source-id: 67d3d033dc8813d59917b0a3fba2550c0efd6dfb
123 lines
4.1 KiB
C++
123 lines
4.1 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_NAMESPACE {
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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,
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const std::shared_ptr<IOTracer>& io_tracer,
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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, io_tracer),
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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_dir_(db_options_.GetWalDir()),
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wal_in_db_path_(db_options_.IsWalDirSameAsDBPath()),
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io_tracer_(io_tracer) {}
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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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const FileSystemPtr 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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const std::string& wal_dir_;
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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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std::shared_ptr<IOTracer> io_tracer_;
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};
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#endif // ROCKSDB_LITE
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} // namespace ROCKSDB_NAMESPACE
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