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635905481d
Summary: Decoupling code that deals with archived log files outside of DBImpl. That will make this code easier to reason about and test. It will also make the code easier to improve, because an improver doesn't have to understand DBImpl code in entirety. Test Plan: added test Reviewers: ljin, yhchiang, rven, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D27873
96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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 "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/types.h"
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#include "rocksdb/transaction_log.h"
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#include "rocksdb/status.h"
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#include "db/version_set.h"
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namespace rocksdb {
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#ifndef ROCKSDB_LITE
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class WalManager {
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public:
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WalManager(const DBOptions& db_options, const EnvOptions& env_options)
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: db_options_(db_options),
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env_options_(env_options),
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env_(db_options.env),
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purge_wal_files_last_run_(0) {}
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virtual Status GetSortedWalFiles(VectorLogPtr& files);
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virtual 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 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,
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SequenceNumber* sequence) {
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return ReadFirstLine(fname, 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, SequenceNumber* sequence);
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// ------- state from DBImpl ------
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const DBOptions& db_options_;
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const EnvOptions& env_options_;
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Env* env_;
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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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// 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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