e3d3567b5b
Summary: Based on @sdong's feedback in the diff, we shouldn't keep db_mutex in CompactionJob's state. This diff removes db_mutex from CompactionJob state, by making next_file_number_ atomic. That way we only need to pass the lock to InstallCompactionResults() because of LogAndApply() Test Plan: make check Reviewers: ljin, yhchiang, rven, sdong Reviewed By: sdong Subscribers: sdong, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D28491
127 lines
4.0 KiB
C++
127 lines
4.0 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 <functional>
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#include "db/dbformat.h"
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#include "db/log_writer.h"
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#include "db/snapshot.h"
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#include "db/column_family.h"
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#include "db/version_edit.h"
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#include "db/memtable_list.h"
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#include "port/port.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/memtablerep.h"
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#include "rocksdb/compaction_filter.h"
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#include "rocksdb/transaction_log.h"
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#include "util/autovector.h"
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#include "util/stop_watch.h"
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#include "util/thread_local.h"
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#include "util/scoped_arena_iterator.h"
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#include "db/internal_stats.h"
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#include "db/write_controller.h"
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#include "db/flush_scheduler.h"
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#include "db/write_thread.h"
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#include "db/job_context.h"
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namespace rocksdb {
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class MemTable;
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class TableCache;
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class Version;
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class VersionEdit;
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class VersionSet;
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class Arena;
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class CompactionJob {
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public:
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// TODO(icanadi) make effort to reduce number of parameters here
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// IMPORTANT: mutable_cf_options needs to be alive while CompactionJob is
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// alive
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CompactionJob(Compaction* compaction, const DBOptions& db_options,
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const MutableCFOptions& mutable_cf_options,
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const EnvOptions& env_options, VersionSet* versions,
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std::atomic<bool>* shutting_down, LogBuffer* log_buffer,
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Directory* db_directory, Statistics* stats,
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SnapshotList* snapshot_list, bool is_snapshot_supported,
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std::shared_ptr<Cache> table_cache,
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std::function<uint64_t()> yield_callback);
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~CompactionJob() { assert(compact_ == nullptr); }
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// no copy/move
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CompactionJob(CompactionJob&& job) = delete;
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CompactionJob(const CompactionJob& job) = delete;
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CompactionJob& operator=(const CompactionJob& job) = delete;
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// REQUIRED: mutex held
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void Prepare();
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// REQUIRED mutex not held
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Status Run();
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// REQUIRED: mutex held
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// status is the return of Run()
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Status Install(Status status, port::Mutex* db_mutex);
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private:
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void AllocateCompactionOutputFileNumbers();
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// Call compaction filter if is_compaction_v2 is not true. Then iterate
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// through input and compact the kv-pairs
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Status ProcessKeyValueCompaction(int64_t* imm_micros, Iterator* input,
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bool is_compaction_v2);
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// Call compaction_filter_v2->Filter() on kv-pairs in compact
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void CallCompactionFilterV2(CompactionFilterV2* compaction_filter_v2);
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Status FinishCompactionOutputFile(Iterator* input);
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Status InstallCompactionResults(port::Mutex* db_mutex);
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SequenceNumber findEarliestVisibleSnapshot(
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SequenceNumber in, const std::vector<SequenceNumber>& snapshots,
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SequenceNumber* prev_snapshot);
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void RecordCompactionIOStats();
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Status OpenCompactionOutputFile();
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void CleanupCompaction(Status status);
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// CompactionJob state
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struct CompactionState;
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CompactionState* compact_;
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bool bottommost_level_;
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SequenceNumber earliest_snapshot_;
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SequenceNumber visible_at_tip_;
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SequenceNumber latest_snapshot_;
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InternalStats::CompactionStats compaction_stats_;
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// DBImpl state
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const DBOptions& db_options_;
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const MutableCFOptions& mutable_cf_options_;
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const EnvOptions& env_options_;
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Env* env_;
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VersionSet* versions_;
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std::atomic<bool>* shutting_down_;
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LogBuffer* log_buffer_;
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Directory* db_directory_;
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Statistics* stats_;
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SnapshotList* snapshots_;
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bool is_snapshot_supported_;
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std::shared_ptr<Cache> table_cache_;
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// yield callback
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std::function<uint64_t()> yield_callback_;
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};
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} // namespace rocksdb
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