Summary: As title, make sure Prev() works as expected with Next() when the current iter->key() in the range of the same prefix in prefix seek mode Test Plan: make all check -j64 (add prefix_test with PrefixSeekModePrev test case) Reviewers: andrewkr, sdong, IslamAbdelRahman Reviewed By: IslamAbdelRahman Subscribers: yoshinorim, andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D61419
1089 lines
43 KiB
C++
1089 lines
43 KiB
C++
// Copyright (c) 2011-present, 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 <functional>
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#include <limits>
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#include <list>
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#include <queue>
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#include <set>
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#include <string>
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#include <utility>
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#include <vector>
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#include "db/column_family.h"
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#include "db/compaction_job.h"
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#include "db/db_iter.h"
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#include "db/dbformat.h"
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#include "db/flush_job.h"
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#include "db/flush_scheduler.h"
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#include "db/internal_stats.h"
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#include "db/log_writer.h"
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#include "db/snapshot_impl.h"
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#include "db/version_edit.h"
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#include "db/wal_manager.h"
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#include "db/write_controller.h"
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#include "db/write_thread.h"
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#include "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/transaction_log.h"
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#include "rocksdb/write_buffer_manager.h"
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#include "table/scoped_arena_iterator.h"
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#include "util/autovector.h"
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#include "util/event_logger.h"
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#include "util/hash.h"
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#include "util/instrumented_mutex.h"
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#include "util/stop_watch.h"
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#include "util/thread_local.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 WriteCallback;
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struct JobContext;
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struct ExternalSstFileInfo;
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struct MemTableInfo;
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class DBImpl : public DB {
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public:
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DBImpl(const DBOptions& options, const std::string& dbname);
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virtual ~DBImpl();
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// Implementations of the DB interface
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using DB::Put;
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virtual Status Put(const WriteOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) override;
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using DB::Merge;
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virtual Status Merge(const WriteOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) override;
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using DB::Delete;
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virtual Status Delete(const WriteOptions& options,
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ColumnFamilyHandle* column_family,
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const Slice& key) override;
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using DB::SingleDelete;
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virtual Status SingleDelete(const WriteOptions& options,
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ColumnFamilyHandle* column_family,
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const Slice& key) override;
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using DB::Write;
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virtual Status Write(const WriteOptions& options,
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WriteBatch* updates) override;
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using DB::Get;
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virtual Status Get(const ReadOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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std::string* value) override;
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using DB::MultiGet;
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virtual std::vector<Status> MultiGet(
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const ReadOptions& options,
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const std::vector<ColumnFamilyHandle*>& column_family,
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const std::vector<Slice>& keys,
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std::vector<std::string>* values) override;
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virtual Status CreateColumnFamily(const ColumnFamilyOptions& options,
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const std::string& column_family,
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ColumnFamilyHandle** handle) override;
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virtual Status DropColumnFamily(ColumnFamilyHandle* column_family) override;
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// Returns false if key doesn't exist in the database and true if it may.
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// If value_found is not passed in as null, then return the value if found in
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// memory. On return, if value was found, then value_found will be set to true
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// , otherwise false.
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using DB::KeyMayExist;
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virtual bool KeyMayExist(const ReadOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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std::string* value,
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bool* value_found = nullptr) override;
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using DB::NewIterator;
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virtual Iterator* NewIterator(const ReadOptions& options,
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ColumnFamilyHandle* column_family) override;
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virtual Status NewIterators(
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const ReadOptions& options,
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const std::vector<ColumnFamilyHandle*>& column_families,
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std::vector<Iterator*>* iterators) override;
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virtual const Snapshot* GetSnapshot() override;
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virtual void ReleaseSnapshot(const Snapshot* snapshot) override;
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using DB::GetProperty;
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virtual bool GetProperty(ColumnFamilyHandle* column_family,
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const Slice& property, std::string* value) override;
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using DB::GetIntProperty;
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virtual bool GetIntProperty(ColumnFamilyHandle* column_family,
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const Slice& property, uint64_t* value) override;
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using DB::GetAggregatedIntProperty;
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virtual bool GetAggregatedIntProperty(const Slice& property,
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uint64_t* aggregated_value) override;
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using DB::GetApproximateSizes;
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virtual void GetApproximateSizes(ColumnFamilyHandle* column_family,
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const Range* range, int n, uint64_t* sizes,
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bool include_memtable = false) override;
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using DB::CompactRange;
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virtual Status CompactRange(const CompactRangeOptions& options,
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ColumnFamilyHandle* column_family,
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const Slice* begin, const Slice* end) override;
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using DB::CompactFiles;
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virtual Status CompactFiles(const CompactionOptions& compact_options,
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ColumnFamilyHandle* column_family,
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const std::vector<std::string>& input_file_names,
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const int output_level,
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const int output_path_id = -1) override;
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virtual Status PauseBackgroundWork() override;
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virtual Status ContinueBackgroundWork() override;
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virtual Status EnableAutoCompaction(
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const std::vector<ColumnFamilyHandle*>& column_family_handles) override;
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using DB::SetOptions;
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Status SetOptions(
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ColumnFamilyHandle* column_family,
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const std::unordered_map<std::string, std::string>& options_map) override;
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using DB::NumberLevels;
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virtual int NumberLevels(ColumnFamilyHandle* column_family) override;
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using DB::MaxMemCompactionLevel;
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virtual int MaxMemCompactionLevel(ColumnFamilyHandle* column_family) override;
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using DB::Level0StopWriteTrigger;
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virtual int Level0StopWriteTrigger(
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ColumnFamilyHandle* column_family) override;
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virtual const std::string& GetName() const override;
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virtual Env* GetEnv() const override;
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using DB::GetOptions;
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virtual const Options& GetOptions(
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ColumnFamilyHandle* column_family) const override;
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using DB::GetDBOptions;
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virtual const DBOptions& GetDBOptions() const override;
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using DB::Flush;
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virtual Status Flush(const FlushOptions& options,
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ColumnFamilyHandle* column_family) override;
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virtual Status SyncWAL() override;
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virtual SequenceNumber GetLatestSequenceNumber() const override;
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#ifndef ROCKSDB_LITE
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virtual Status DisableFileDeletions() override;
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virtual Status EnableFileDeletions(bool force) override;
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virtual int IsFileDeletionsEnabled() const;
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// All the returned filenames start with "/"
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virtual Status GetLiveFiles(std::vector<std::string>&,
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uint64_t* manifest_file_size,
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bool flush_memtable = true) override;
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virtual Status GetSortedWalFiles(VectorLogPtr& files) override;
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virtual Status GetUpdatesSince(
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SequenceNumber seq_number, unique_ptr<TransactionLogIterator>* iter,
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const TransactionLogIterator::ReadOptions&
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read_options = TransactionLogIterator::ReadOptions()) override;
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virtual Status DeleteFile(std::string name) override;
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Status DeleteFilesInRange(ColumnFamilyHandle* column_family,
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const Slice* begin, const Slice* end);
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virtual void GetLiveFilesMetaData(
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std::vector<LiveFileMetaData>* metadata) override;
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// Obtains the meta data of the specified column family of the DB.
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// Status::NotFound() will be returned if the current DB does not have
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// any column family match the specified name.
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// TODO(yhchiang): output parameter is placed in the end in this codebase.
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virtual void GetColumnFamilyMetaData(
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ColumnFamilyHandle* column_family,
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ColumnFamilyMetaData* metadata) override;
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// experimental API
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Status SuggestCompactRange(ColumnFamilyHandle* column_family,
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const Slice* begin, const Slice* end);
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Status PromoteL0(ColumnFamilyHandle* column_family, int target_level);
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// Similar to Write() but will call the callback once on the single write
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// thread to determine whether it is safe to perform the write.
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virtual Status WriteWithCallback(const WriteOptions& write_options,
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WriteBatch* my_batch,
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WriteCallback* callback);
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// Returns the sequence number that is guaranteed to be smaller than or equal
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// to the sequence number of any key that could be inserted into the current
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// memtables. It can then be assumed that any write with a larger(or equal)
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// sequence number will be present in this memtable or a later memtable.
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//
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// If the earliest sequence number could not be determined,
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// kMaxSequenceNumber will be returned.
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//
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// If include_history=true, will also search Memtables in MemTableList
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// History.
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SequenceNumber GetEarliestMemTableSequenceNumber(SuperVersion* sv,
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bool include_history);
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// For a given key, check to see if there are any records for this key
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// in the memtables, including memtable history. If cache_only is false,
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// SST files will also be checked.
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//
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// If a key is found, *found_record_for_key will be set to true and
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// *seq will be set to the stored sequence number for the latest
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// operation on this key or kMaxSequenceNumber if unknown.
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// If no key is found, *found_record_for_key will be set to false.
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//
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// Note: If cache_only=false, it is possible for *seq to be set to 0 if
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// the sequence number has been cleared from the record. If the caller is
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// holding an active db snapshot, we know the missing sequence must be less
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// than the snapshot's sequence number (sequence numbers are only cleared
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// when there are no earlier active snapshots).
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//
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// If NotFound is returned and found_record_for_key is set to false, then no
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// record for this key was found. If the caller is holding an active db
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// snapshot, we know that no key could have existing after this snapshot
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// (since we do not compact keys that have an earlier snapshot).
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//
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// Returns OK or NotFound on success,
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// other status on unexpected error.
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// TODO(andrewkr): this API need to be aware of range deletion operations
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Status GetLatestSequenceForKey(SuperVersion* sv, const Slice& key,
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bool cache_only, SequenceNumber* seq,
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bool* found_record_for_key);
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using DB::AddFile;
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virtual Status AddFile(ColumnFamilyHandle* column_family,
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const std::vector<ExternalSstFileInfo>& file_info_list,
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bool move_file, bool skip_snapshot_check) override;
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virtual Status AddFile(ColumnFamilyHandle* column_family,
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const std::vector<std::string>& file_path_list,
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bool move_file, bool skip_snapshot_check) override;
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#endif // ROCKSDB_LITE
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// Similar to GetSnapshot(), but also lets the db know that this snapshot
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// will be used for transaction write-conflict checking. The DB can then
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// make sure not to compact any keys that would prevent a write-conflict from
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// being detected.
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const Snapshot* GetSnapshotForWriteConflictBoundary();
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// checks if all live files exist on file system and that their file sizes
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// match to our in-memory records
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virtual Status CheckConsistency();
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virtual Status GetDbIdentity(std::string& identity) const override;
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Status RunManualCompaction(ColumnFamilyData* cfd, int input_level,
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int output_level, uint32_t output_path_id,
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const Slice* begin, const Slice* end,
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bool exclusive,
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bool disallow_trivial_move = false);
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// Return an internal iterator over the current state of the database.
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// The keys of this iterator are internal keys (see format.h).
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// The returned iterator should be deleted when no longer needed.
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InternalIterator* NewInternalIterator(
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Arena* arena, ColumnFamilyHandle* column_family = nullptr);
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#ifndef NDEBUG
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// Extra methods (for testing) that are not in the public DB interface
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// Implemented in db_impl_debug.cc
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// Compact any files in the named level that overlap [*begin, *end]
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Status TEST_CompactRange(int level, const Slice* begin, const Slice* end,
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ColumnFamilyHandle* column_family = nullptr,
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bool disallow_trivial_move = false);
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// Force current memtable contents to be flushed.
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Status TEST_FlushMemTable(bool wait = true,
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ColumnFamilyHandle* cfh = nullptr);
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// Wait for memtable compaction
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Status TEST_WaitForFlushMemTable(ColumnFamilyHandle* column_family = nullptr);
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// Wait for any compaction
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Status TEST_WaitForCompact();
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// Return the maximum overlapping data (in bytes) at next level for any
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// file at a level >= 1.
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int64_t TEST_MaxNextLevelOverlappingBytes(ColumnFamilyHandle* column_family =
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nullptr);
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// Return the current manifest file no.
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uint64_t TEST_Current_Manifest_FileNo();
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// get total level0 file size. Only for testing.
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uint64_t TEST_GetLevel0TotalSize();
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void TEST_GetFilesMetaData(ColumnFamilyHandle* column_family,
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std::vector<std::vector<FileMetaData>>* metadata);
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void TEST_LockMutex();
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void TEST_UnlockMutex();
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// REQUIRES: mutex locked
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void* TEST_BeginWrite();
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// REQUIRES: mutex locked
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// pass the pointer that you got from TEST_BeginWrite()
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void TEST_EndWrite(void* w);
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uint64_t TEST_MaxTotalInMemoryState() const {
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return max_total_in_memory_state_;
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}
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size_t TEST_LogsToFreeSize();
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uint64_t TEST_LogfileNumber();
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uint64_t TEST_total_log_size() const { return total_log_size_; }
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// Returns column family name to ImmutableCFOptions map.
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Status TEST_GetAllImmutableCFOptions(
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std::unordered_map<std::string, const ImmutableCFOptions*>* iopts_map);
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// Return the lastest MutableCFOptions of of a column family
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Status TEST_GetLatestMutableCFOptions(ColumnFamilyHandle* column_family,
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MutableCFOptions* mutable_cf_opitons);
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Cache* TEST_table_cache() { return table_cache_.get(); }
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WriteController& TEST_write_controler() { return write_controller_; }
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uint64_t TEST_FindMinLogContainingOutstandingPrep();
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uint64_t TEST_FindMinPrepLogReferencedByMemTable();
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#endif // NDEBUG
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// Return maximum background compaction allowed to be scheduled based on
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// compaction status.
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int BGCompactionsAllowed() const;
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// move logs pending closing from job_context to the DB queue and
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// schedule a purge
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void ScheduleBgLogWriterClose(JobContext* job_context);
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// Returns the list of live files in 'live' and the list
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// of all files in the filesystem in 'candidate_files'.
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// If force == false and the last call was less than
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// db_options_.delete_obsolete_files_period_micros microseconds ago,
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// it will not fill up the job_context
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void FindObsoleteFiles(JobContext* job_context, bool force,
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bool no_full_scan = false);
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// Diffs the files listed in filenames and those that do not
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// belong to live files are posibly removed. Also, removes all the
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// files in sst_delete_files and log_delete_files.
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// It is not necessary to hold the mutex when invoking this method.
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void PurgeObsoleteFiles(const JobContext& background_contet,
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bool schedule_only = false);
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void SchedulePurge();
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ColumnFamilyHandle* DefaultColumnFamily() const override;
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const SnapshotList& snapshots() const { return snapshots_; }
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void CancelAllBackgroundWork(bool wait);
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// Find Super version and reference it. Based on options, it might return
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// the thread local cached one.
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// Call ReturnAndCleanupSuperVersion() when it is no longer needed.
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SuperVersion* GetAndRefSuperVersion(ColumnFamilyData* cfd);
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// Similar to the previous function but looks up based on a column family id.
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// nullptr will be returned if this column family no longer exists.
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// REQUIRED: this function should only be called on the write thread or if the
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// mutex is held.
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SuperVersion* GetAndRefSuperVersion(uint32_t column_family_id);
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// Same as above, should called without mutex held and not on write thread.
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SuperVersion* GetAndRefSuperVersionUnlocked(uint32_t column_family_id);
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// Un-reference the super version and return it to thread local cache if
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// needed. If it is the last reference of the super version. Clean it up
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// after un-referencing it.
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void ReturnAndCleanupSuperVersion(ColumnFamilyData* cfd, SuperVersion* sv);
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// Similar to the previous function but looks up based on a column family id.
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// nullptr will be returned if this column family no longer exists.
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// REQUIRED: this function should only be called on the write thread.
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void ReturnAndCleanupSuperVersion(uint32_t colun_family_id, SuperVersion* sv);
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// Same as above, should called without mutex held and not on write thread.
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void ReturnAndCleanupSuperVersionUnlocked(uint32_t colun_family_id,
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SuperVersion* sv);
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// REQUIRED: this function should only be called on the write thread or if the
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// mutex is held. Return value only valid until next call to this function or
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// mutex is released.
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ColumnFamilyHandle* GetColumnFamilyHandle(uint32_t column_family_id);
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// Same as above, should called without mutex held and not on write thread.
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ColumnFamilyHandle* GetColumnFamilyHandleUnlocked(uint32_t column_family_id);
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// Returns the number of currently running flushes.
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// REQUIREMENT: mutex_ must be held when calling this function.
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int num_running_flushes() {
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mutex_.AssertHeld();
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return num_running_flushes_;
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}
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// Returns the number of currently running compactions.
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// REQUIREMENT: mutex_ must be held when calling this function.
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int num_running_compactions() {
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mutex_.AssertHeld();
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return num_running_compactions_;
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}
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// hollow transactions shell used for recovery.
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// these will then be passed to TransactionDB so that
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// locks can be reacquired before writing can resume.
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struct RecoveredTransaction {
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uint64_t log_number_;
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std::string name_;
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WriteBatch* batch_;
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explicit RecoveredTransaction(const uint64_t log, const std::string& name,
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WriteBatch* batch)
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: log_number_(log), name_(name), batch_(batch) {}
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~RecoveredTransaction() { delete batch_; }
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};
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bool allow_2pc() const { return db_options_.allow_2pc; }
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std::unordered_map<std::string, RecoveredTransaction*>
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recovered_transactions() {
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return recovered_transactions_;
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}
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RecoveredTransaction* GetRecoveredTransaction(const std::string& name) {
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auto it = recovered_transactions_.find(name);
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if (it == recovered_transactions_.end()) {
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return nullptr;
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} else {
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return it->second;
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}
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}
|
|
|
|
void InsertRecoveredTransaction(const uint64_t log, const std::string& name,
|
|
WriteBatch* batch) {
|
|
recovered_transactions_[name] = new RecoveredTransaction(log, name, batch);
|
|
MarkLogAsContainingPrepSection(log);
|
|
}
|
|
|
|
void DeleteRecoveredTransaction(const std::string& name) {
|
|
auto it = recovered_transactions_.find(name);
|
|
assert(it != recovered_transactions_.end());
|
|
auto* trx = it->second;
|
|
recovered_transactions_.erase(it);
|
|
MarkLogAsHavingPrepSectionFlushed(trx->log_number_);
|
|
delete trx;
|
|
}
|
|
|
|
void DeleteAllRecoveredTransactions() {
|
|
for (auto it = recovered_transactions_.begin();
|
|
it != recovered_transactions_.end(); it++) {
|
|
delete it->second;
|
|
}
|
|
recovered_transactions_.clear();
|
|
}
|
|
|
|
void MarkLogAsHavingPrepSectionFlushed(uint64_t log);
|
|
void MarkLogAsContainingPrepSection(uint64_t log);
|
|
void AddToLogsToFreeQueue(log::Writer* log_writer) {
|
|
logs_to_free_queue_.push_back(log_writer);
|
|
}
|
|
|
|
Status NewDB();
|
|
|
|
protected:
|
|
Env* const env_;
|
|
const std::string dbname_;
|
|
unique_ptr<VersionSet> versions_;
|
|
const DBOptions db_options_;
|
|
Statistics* stats_;
|
|
std::unordered_map<std::string, RecoveredTransaction*>
|
|
recovered_transactions_;
|
|
|
|
InternalIterator* NewInternalIterator(const ReadOptions&,
|
|
ColumnFamilyData* cfd,
|
|
SuperVersion* super_version,
|
|
Arena* arena);
|
|
|
|
// Except in DB::Open(), WriteOptionsFile can only be called when:
|
|
// 1. WriteThread::Writer::EnterUnbatched() is used.
|
|
// 2. db_mutex is held
|
|
Status WriteOptionsFile();
|
|
|
|
// The following two functions can only be called when:
|
|
// 1. WriteThread::Writer::EnterUnbatched() is used.
|
|
// 2. db_mutex is NOT held
|
|
Status RenameTempFileToOptionsFile(const std::string& file_name);
|
|
Status DeleteObsoleteOptionsFiles();
|
|
|
|
void NotifyOnFlushCompleted(ColumnFamilyData* cfd, FileMetaData* file_meta,
|
|
const MutableCFOptions& mutable_cf_options,
|
|
int job_id, TableProperties prop);
|
|
|
|
void NotifyOnCompactionCompleted(ColumnFamilyData* cfd,
|
|
Compaction *c, const Status &st,
|
|
const CompactionJobStats& job_stats,
|
|
int job_id);
|
|
void NotifyOnMemTableSealed(ColumnFamilyData* cfd,
|
|
const MemTableInfo& mem_table_info);
|
|
|
|
void NewThreadStatusCfInfo(ColumnFamilyData* cfd) const;
|
|
|
|
void EraseThreadStatusCfInfo(ColumnFamilyData* cfd) const;
|
|
|
|
void EraseThreadStatusDbInfo() const;
|
|
|
|
Status WriteImpl(const WriteOptions& options, WriteBatch* updates,
|
|
WriteCallback* callback = nullptr,
|
|
uint64_t* log_used = nullptr, uint64_t log_ref = 0,
|
|
bool disable_memtable = false);
|
|
|
|
uint64_t FindMinLogContainingOutstandingPrep();
|
|
uint64_t FindMinPrepLogReferencedByMemTable();
|
|
|
|
private:
|
|
friend class DB;
|
|
friend class InternalStats;
|
|
friend class TransactionImpl;
|
|
#ifndef ROCKSDB_LITE
|
|
friend class ForwardIterator;
|
|
#endif
|
|
friend struct SuperVersion;
|
|
friend class CompactedDBImpl;
|
|
#ifndef NDEBUG
|
|
friend class XFTransactionWriteHandler;
|
|
#endif
|
|
struct CompactionState;
|
|
|
|
struct WriteContext;
|
|
|
|
struct PurgeFileInfo;
|
|
|
|
// Recover the descriptor from persistent storage. May do a significant
|
|
// amount of work to recover recently logged updates. Any changes to
|
|
// be made to the descriptor are added to *edit.
|
|
Status Recover(const std::vector<ColumnFamilyDescriptor>& column_families,
|
|
bool read_only = false, bool error_if_log_file_exist = false,
|
|
bool error_if_data_exists_in_logs = false);
|
|
|
|
void MaybeIgnoreError(Status* s) const;
|
|
|
|
const Status CreateArchivalDirectory();
|
|
|
|
// Delete any unneeded files and stale in-memory entries.
|
|
void DeleteObsoleteFiles();
|
|
// Delete obsolete files and log status and information of file deletion
|
|
void DeleteObsoleteFileImpl(Status file_deletion_status, int job_id,
|
|
const std::string& fname, FileType type,
|
|
uint64_t number, uint32_t path_id);
|
|
|
|
// Background process needs to call
|
|
// auto x = CaptureCurrentFileNumberInPendingOutputs()
|
|
// auto file_num = versions_->NewFileNumber();
|
|
// <do something>
|
|
// ReleaseFileNumberFromPendingOutputs(x)
|
|
// This will protect any file with number `file_num` or greater from being
|
|
// deleted while <do something> is running.
|
|
// -----------
|
|
// This function will capture current file number and append it to
|
|
// pending_outputs_. This will prevent any background process to delete any
|
|
// file created after this point.
|
|
std::list<uint64_t>::iterator CaptureCurrentFileNumberInPendingOutputs();
|
|
// This function should be called with the result of
|
|
// CaptureCurrentFileNumberInPendingOutputs(). It then marks that any file
|
|
// created between the calls CaptureCurrentFileNumberInPendingOutputs() and
|
|
// ReleaseFileNumberFromPendingOutputs() can now be deleted (if it's not live
|
|
// and blocked by any other pending_outputs_ calls)
|
|
void ReleaseFileNumberFromPendingOutputs(std::list<uint64_t>::iterator v);
|
|
|
|
Status SyncClosedLogs(JobContext* job_context);
|
|
|
|
// Flush the in-memory write buffer to storage. Switches to a new
|
|
// log-file/memtable and writes a new descriptor iff successful.
|
|
Status FlushMemTableToOutputFile(ColumnFamilyData* cfd,
|
|
const MutableCFOptions& mutable_cf_options,
|
|
bool* madeProgress, JobContext* job_context,
|
|
LogBuffer* log_buffer);
|
|
|
|
// REQUIRES: log_numbers are sorted in ascending order
|
|
Status RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
|
|
SequenceNumber* max_sequence, bool read_only);
|
|
|
|
// The following two methods are used to flush a memtable to
|
|
// storage. The first one is used at database RecoveryTime (when the
|
|
// database is opened) and is heavyweight because it holds the mutex
|
|
// for the entire period. The second method WriteLevel0Table supports
|
|
// concurrent flush memtables to storage.
|
|
Status WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
|
|
MemTable* mem, VersionEdit* edit);
|
|
|
|
// num_bytes: for slowdown case, delay time is calculated based on
|
|
// `num_bytes` going through.
|
|
Status DelayWrite(uint64_t num_bytes);
|
|
|
|
Status ScheduleFlushes(WriteContext* context);
|
|
|
|
Status SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context);
|
|
|
|
// Force current memtable contents to be flushed.
|
|
Status FlushMemTable(ColumnFamilyData* cfd, const FlushOptions& options);
|
|
|
|
// Wait for memtable flushed
|
|
Status WaitForFlushMemTable(ColumnFamilyData* cfd);
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
// Finds the lowest level in the DB that the ingested file can be added to
|
|
// REQUIRES: mutex_ held
|
|
int PickLevelForIngestedFile(ColumnFamilyData* cfd,
|
|
const ExternalSstFileInfo& file_info);
|
|
|
|
Status CompactFilesImpl(
|
|
const CompactionOptions& compact_options, ColumnFamilyData* cfd,
|
|
Version* version, const std::vector<std::string>& input_file_names,
|
|
const int output_level, int output_path_id, JobContext* job_context,
|
|
LogBuffer* log_buffer);
|
|
Status ReadExternalSstFileInfo(ColumnFamilyHandle* column_family,
|
|
const std::string& file_path,
|
|
ExternalSstFileInfo* file_info);
|
|
|
|
#endif // ROCKSDB_LITE
|
|
|
|
ColumnFamilyData* GetColumnFamilyDataByName(const std::string& cf_name);
|
|
|
|
void MaybeScheduleFlushOrCompaction();
|
|
void SchedulePendingFlush(ColumnFamilyData* cfd);
|
|
void SchedulePendingCompaction(ColumnFamilyData* cfd);
|
|
void SchedulePendingPurge(std::string fname, FileType type, uint64_t number,
|
|
uint32_t path_id, int job_id);
|
|
static void BGWorkCompaction(void* arg);
|
|
static void BGWorkFlush(void* db);
|
|
static void BGWorkPurge(void* arg);
|
|
static void UnscheduleCallback(void* arg);
|
|
void BackgroundCallCompaction(void* arg);
|
|
void BackgroundCallFlush();
|
|
void BackgroundCallPurge();
|
|
Status BackgroundCompaction(bool* madeProgress, JobContext* job_context,
|
|
LogBuffer* log_buffer, void* m = 0);
|
|
Status BackgroundFlush(bool* madeProgress, JobContext* job_context,
|
|
LogBuffer* log_buffer);
|
|
|
|
void PrintStatistics();
|
|
|
|
// dump rocksdb.stats to LOG
|
|
void MaybeDumpStats();
|
|
|
|
// Return the minimum empty level that could hold the total data in the
|
|
// input level. Return the input level, if such level could not be found.
|
|
int FindMinimumEmptyLevelFitting(ColumnFamilyData* cfd,
|
|
const MutableCFOptions& mutable_cf_options, int level);
|
|
|
|
// Move the files in the input level to the target level.
|
|
// If target_level < 0, automatically calculate the minimum level that could
|
|
// hold the data set.
|
|
Status ReFitLevel(ColumnFamilyData* cfd, int level, int target_level = -1);
|
|
|
|
// helper functions for adding and removing from flush & compaction queues
|
|
void AddToCompactionQueue(ColumnFamilyData* cfd);
|
|
ColumnFamilyData* PopFirstFromCompactionQueue();
|
|
void AddToFlushQueue(ColumnFamilyData* cfd);
|
|
ColumnFamilyData* PopFirstFromFlushQueue();
|
|
|
|
// helper function to call after some of the logs_ were synced
|
|
void MarkLogsSynced(uint64_t up_to, bool synced_dir, const Status& status);
|
|
|
|
const Snapshot* GetSnapshotImpl(bool is_write_conflict_boundary);
|
|
|
|
// table_cache_ provides its own synchronization
|
|
std::shared_ptr<Cache> table_cache_;
|
|
|
|
// Lock over the persistent DB state. Non-nullptr iff successfully acquired.
|
|
FileLock* db_lock_;
|
|
|
|
// The mutex for options file related operations.
|
|
// NOTE: should never acquire options_file_mutex_ and mutex_ at the
|
|
// same time.
|
|
InstrumentedMutex options_files_mutex_;
|
|
// State below is protected by mutex_
|
|
InstrumentedMutex mutex_;
|
|
|
|
std::atomic<bool> shutting_down_;
|
|
// This condition variable is signaled on these conditions:
|
|
// * whenever bg_compaction_scheduled_ goes down to 0
|
|
// * if AnyManualCompaction, whenever a compaction finishes, even if it hasn't
|
|
// made any progress
|
|
// * whenever a compaction made any progress
|
|
// * whenever bg_flush_scheduled_ or bg_purge_scheduled_ value decreases
|
|
// (i.e. whenever a flush is done, even if it didn't make any progress)
|
|
// * whenever there is an error in background purge, flush or compaction
|
|
InstrumentedCondVar bg_cv_;
|
|
uint64_t logfile_number_;
|
|
std::deque<uint64_t>
|
|
log_recycle_files; // a list of log files that we can recycle
|
|
bool log_dir_synced_;
|
|
bool log_empty_;
|
|
ColumnFamilyHandleImpl* default_cf_handle_;
|
|
InternalStats* default_cf_internal_stats_;
|
|
unique_ptr<ColumnFamilyMemTablesImpl> column_family_memtables_;
|
|
struct LogFileNumberSize {
|
|
explicit LogFileNumberSize(uint64_t _number)
|
|
: number(_number) {}
|
|
void AddSize(uint64_t new_size) { size += new_size; }
|
|
uint64_t number;
|
|
uint64_t size = 0;
|
|
bool getting_flushed = false;
|
|
};
|
|
struct LogWriterNumber {
|
|
// pass ownership of _writer
|
|
LogWriterNumber(uint64_t _number, log::Writer* _writer)
|
|
: number(_number), writer(_writer) {}
|
|
|
|
log::Writer* ReleaseWriter() {
|
|
auto* w = writer;
|
|
writer = nullptr;
|
|
return w;
|
|
}
|
|
void ClearWriter() {
|
|
delete writer;
|
|
writer = nullptr;
|
|
}
|
|
|
|
uint64_t number;
|
|
// Visual Studio doesn't support deque's member to be noncopyable because
|
|
// of a unique_ptr as a member.
|
|
log::Writer* writer; // own
|
|
// true for some prefix of logs_
|
|
bool getting_synced = false;
|
|
};
|
|
std::deque<LogFileNumberSize> alive_log_files_;
|
|
// Log files that aren't fully synced, and the current log file.
|
|
// Synchronization:
|
|
// - push_back() is done from write thread with locked mutex_,
|
|
// - pop_front() is done from any thread with locked mutex_,
|
|
// - back() and items with getting_synced=true are not popped,
|
|
// - it follows that write thread with unlocked mutex_ can safely access
|
|
// back() and items with getting_synced=true.
|
|
std::deque<LogWriterNumber> logs_;
|
|
// Signaled when getting_synced becomes false for some of the logs_.
|
|
InstrumentedCondVar log_sync_cv_;
|
|
uint64_t total_log_size_;
|
|
// only used for dynamically adjusting max_total_wal_size. it is a sum of
|
|
// [write_buffer_size * max_write_buffer_number] over all column families
|
|
uint64_t max_total_in_memory_state_;
|
|
// If true, we have only one (default) column family. We use this to optimize
|
|
// some code-paths
|
|
bool single_column_family_mode_;
|
|
// If this is non-empty, we need to delete these log files in background
|
|
// threads. Protected by db mutex.
|
|
autovector<log::Writer*> logs_to_free_;
|
|
|
|
bool is_snapshot_supported_;
|
|
|
|
// Class to maintain directories for all database paths other than main one.
|
|
class Directories {
|
|
public:
|
|
Status SetDirectories(Env* env, const std::string& dbname,
|
|
const std::string& wal_dir,
|
|
const std::vector<DbPath>& data_paths);
|
|
|
|
Directory* GetDataDir(size_t path_id);
|
|
|
|
Directory* GetWalDir() {
|
|
if (wal_dir_) {
|
|
return wal_dir_.get();
|
|
}
|
|
return db_dir_.get();
|
|
}
|
|
|
|
Directory* GetDbDir() { return db_dir_.get(); }
|
|
|
|
private:
|
|
std::unique_ptr<Directory> db_dir_;
|
|
std::vector<std::unique_ptr<Directory>> data_dirs_;
|
|
std::unique_ptr<Directory> wal_dir_;
|
|
|
|
Status CreateAndNewDirectory(Env* env, const std::string& dirname,
|
|
std::unique_ptr<Directory>* directory) const;
|
|
};
|
|
|
|
Directories directories_;
|
|
|
|
WriteBufferManager* write_buffer_manager_;
|
|
|
|
WriteThread write_thread_;
|
|
|
|
WriteBatch tmp_batch_;
|
|
|
|
WriteController write_controller_;
|
|
|
|
// Size of the last batch group. In slowdown mode, next write needs to
|
|
// sleep if it uses up the quota.
|
|
uint64_t last_batch_group_size_;
|
|
|
|
FlushScheduler flush_scheduler_;
|
|
|
|
SnapshotList snapshots_;
|
|
|
|
// For each background job, pending_outputs_ keeps the current file number at
|
|
// the time that background job started.
|
|
// FindObsoleteFiles()/PurgeObsoleteFiles() never deletes any file that has
|
|
// number bigger than any of the file number in pending_outputs_. Since file
|
|
// numbers grow monotonically, this also means that pending_outputs_ is always
|
|
// sorted. After a background job is done executing, its file number is
|
|
// deleted from pending_outputs_, which allows PurgeObsoleteFiles() to clean
|
|
// it up.
|
|
// State is protected with db mutex.
|
|
std::list<uint64_t> pending_outputs_;
|
|
|
|
// PurgeFileInfo is a structure to hold information of files to be deleted in
|
|
// purge_queue_
|
|
struct PurgeFileInfo {
|
|
std::string fname;
|
|
FileType type;
|
|
uint64_t number;
|
|
uint32_t path_id;
|
|
int job_id;
|
|
PurgeFileInfo(std::string fn, FileType t, uint64_t num, uint32_t pid,
|
|
int jid)
|
|
: fname(fn), type(t), number(num), path_id(pid), job_id(jid) {}
|
|
};
|
|
|
|
// flush_queue_ and compaction_queue_ hold column families that we need to
|
|
// flush and compact, respectively.
|
|
// A column family is inserted into flush_queue_ when it satisfies condition
|
|
// cfd->imm()->IsFlushPending()
|
|
// A column family is inserted into compaction_queue_ when it satisfied
|
|
// condition cfd->NeedsCompaction()
|
|
// Column families in this list are all Ref()-erenced
|
|
// TODO(icanadi) Provide some kind of ReferencedColumnFamily class that will
|
|
// do RAII on ColumnFamilyData
|
|
// Column families are in this queue when they need to be flushed or
|
|
// compacted. Consumers of these queues are flush and compaction threads. When
|
|
// column family is put on this queue, we increase unscheduled_flushes_ and
|
|
// unscheduled_compactions_. When these variables are bigger than zero, that
|
|
// means we need to schedule background threads for compaction and thread.
|
|
// Once the background threads are scheduled, we decrease unscheduled_flushes_
|
|
// and unscheduled_compactions_. That way we keep track of number of
|
|
// compaction and flush threads we need to schedule. This scheduling is done
|
|
// in MaybeScheduleFlushOrCompaction()
|
|
// invariant(column family present in flush_queue_ <==>
|
|
// ColumnFamilyData::pending_flush_ == true)
|
|
std::deque<ColumnFamilyData*> flush_queue_;
|
|
// invariant(column family present in compaction_queue_ <==>
|
|
// ColumnFamilyData::pending_compaction_ == true)
|
|
std::deque<ColumnFamilyData*> compaction_queue_;
|
|
|
|
// A queue to store filenames of the files to be purged
|
|
std::deque<PurgeFileInfo> purge_queue_;
|
|
|
|
// A queue to store log writers to close
|
|
std::deque<log::Writer*> logs_to_free_queue_;
|
|
int unscheduled_flushes_;
|
|
int unscheduled_compactions_;
|
|
|
|
// count how many background compactions are running or have been scheduled
|
|
int bg_compaction_scheduled_;
|
|
|
|
// stores the number of compactions are currently running
|
|
int num_running_compactions_;
|
|
|
|
// number of background memtable flush jobs, submitted to the HIGH pool
|
|
int bg_flush_scheduled_;
|
|
|
|
// stores the number of flushes are currently running
|
|
int num_running_flushes_;
|
|
|
|
// number of background obsolete file purge jobs, submitted to the HIGH pool
|
|
int bg_purge_scheduled_;
|
|
|
|
// Information for a manual compaction
|
|
struct ManualCompaction {
|
|
ColumnFamilyData* cfd;
|
|
int input_level;
|
|
int output_level;
|
|
uint32_t output_path_id;
|
|
Status status;
|
|
bool done;
|
|
bool in_progress; // compaction request being processed?
|
|
bool incomplete; // only part of requested range compacted
|
|
bool exclusive; // current behavior of only one manual
|
|
bool disallow_trivial_move; // Force actual compaction to run
|
|
const InternalKey* begin; // nullptr means beginning of key range
|
|
const InternalKey* end; // nullptr means end of key range
|
|
InternalKey* manual_end; // how far we are compacting
|
|
InternalKey tmp_storage; // Used to keep track of compaction progress
|
|
InternalKey tmp_storage1; // Used to keep track of compaction progress
|
|
Compaction* compaction;
|
|
};
|
|
std::deque<ManualCompaction*> manual_compaction_dequeue_;
|
|
|
|
struct CompactionArg {
|
|
DBImpl* db;
|
|
ManualCompaction* m;
|
|
};
|
|
|
|
// Have we encountered a background error in paranoid mode?
|
|
Status bg_error_;
|
|
|
|
// shall we disable deletion of obsolete files
|
|
// if 0 the deletion is enabled.
|
|
// if non-zero, files will not be getting deleted
|
|
// This enables two different threads to call
|
|
// EnableFileDeletions() and DisableFileDeletions()
|
|
// without any synchronization
|
|
int disable_delete_obsolete_files_;
|
|
|
|
// next time when we should run DeleteObsoleteFiles with full scan
|
|
uint64_t delete_obsolete_files_next_run_;
|
|
|
|
// last time stats were dumped to LOG
|
|
std::atomic<uint64_t> last_stats_dump_time_microsec_;
|
|
|
|
// Each flush or compaction gets its own job id. this counter makes sure
|
|
// they're unique
|
|
std::atomic<int> next_job_id_;
|
|
|
|
// A flag indicating whether the current rocksdb database has any
|
|
// data that is not yet persisted into either WAL or SST file.
|
|
// Used when disableWAL is true.
|
|
bool has_unpersisted_data_;
|
|
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static const int KEEP_LOG_FILE_NUM = 1000;
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// MSVC version 1800 still does not have constexpr for ::max()
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static const uint64_t kNoTimeOut = port::kMaxUint64;
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std::string db_absolute_path_;
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// The options to access storage files
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const EnvOptions env_options_;
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// A set of compactions that are running right now
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// REQUIRES: mutex held
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std::unordered_set<Compaction*> running_compactions_;
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#ifndef ROCKSDB_LITE
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WalManager wal_manager_;
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#endif // ROCKSDB_LITE
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// Unified interface for logging events
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EventLogger event_logger_;
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// A value of > 0 temporarily disables scheduling of background work
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int bg_work_paused_;
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// A value of > 0 temporarily disables scheduling of background compaction
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int bg_compaction_paused_;
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// Guard against multiple concurrent refitting
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bool refitting_level_;
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// Indicate DB was opened successfully
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bool opened_successfully_;
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// minmum log number still containing prepared data.
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// this is used by FindObsoleteFiles to determine which
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// flushed logs we must keep around because they still
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// contain prepared data which has not been flushed or rolled back
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std::priority_queue<uint64_t, std::vector<uint64_t>, std::greater<uint64_t>>
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min_log_with_prep_;
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// to be used in conjunction with min_log_with_prep_.
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// once a transaction with data in log L is committed or rolled back
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// rather than removing the value from the heap we add that value
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// to prepared_section_completed_ which maps LOG -> instance_count
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// since a log could contain multiple prepared sections
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//
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// when trying to determine the minmum log still active we first
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// consult min_log_with_prep_. while that root value maps to
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// a value > 0 in prepared_section_completed_ we decrement the
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// instance_count for that log and pop the root value in
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// min_log_with_prep_. This will work the same as a min_heap
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// where we are deleteing arbitrary elements and the up heaping.
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std::unordered_map<uint64_t, uint64_t> prepared_section_completed_;
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std::mutex prep_heap_mutex_;
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// No copying allowed
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DBImpl(const DBImpl&);
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void operator=(const DBImpl&);
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// Return the earliest snapshot where seqno is visible.
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// Store the snapshot right before that, if any, in prev_snapshot
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inline SequenceNumber findEarliestVisibleSnapshot(
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SequenceNumber in,
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std::vector<SequenceNumber>& snapshots,
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SequenceNumber* prev_snapshot);
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// Background threads call this function, which is just a wrapper around
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// the InstallSuperVersion() function. Background threads carry
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// job_context which can have new_superversion already
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// allocated.
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void InstallSuperVersionAndScheduleWorkWrapper(
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ColumnFamilyData* cfd, JobContext* job_context,
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const MutableCFOptions& mutable_cf_options);
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// All ColumnFamily state changes go through this function. Here we analyze
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// the new state and we schedule background work if we detect that the new
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// state needs flush or compaction.
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SuperVersion* InstallSuperVersionAndScheduleWork(
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ColumnFamilyData* cfd, SuperVersion* new_sv,
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const MutableCFOptions& mutable_cf_options);
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#ifndef ROCKSDB_LITE
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using DB::GetPropertiesOfAllTables;
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virtual Status GetPropertiesOfAllTables(ColumnFamilyHandle* column_family,
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TablePropertiesCollection* props)
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override;
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virtual Status GetPropertiesOfTablesInRange(
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ColumnFamilyHandle* column_family, const Range* range, std::size_t n,
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TablePropertiesCollection* props) override;
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#endif // ROCKSDB_LITE
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// Function that Get and KeyMayExist call with no_io true or false
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// Note: 'value_found' from KeyMayExist propagates here
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Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
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const Slice& key, std::string* value,
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bool* value_found = nullptr);
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bool GetIntPropertyInternal(ColumnFamilyData* cfd,
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const DBPropertyInfo& property_info,
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bool is_locked, uint64_t* value);
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bool HasPendingManualCompaction();
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bool HasExclusiveManualCompaction();
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void AddManualCompaction(ManualCompaction* m);
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void RemoveManualCompaction(ManualCompaction* m);
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bool ShouldntRunManualCompaction(ManualCompaction* m);
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bool HaveManualCompaction(ColumnFamilyData* cfd);
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bool MCOverlap(ManualCompaction* m, ManualCompaction* m1);
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};
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// Sanitize db options. The caller should delete result.info_log if
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// it is not equal to src.info_log.
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extern Options SanitizeOptions(const std::string& db,
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const InternalKeyComparator* icmp,
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const Options& src);
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extern DBOptions SanitizeOptions(const std::string& db, const DBOptions& src);
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// Fix user-supplied options to be reasonable
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template <class T, class V>
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static void ClipToRange(T* ptr, V minvalue, V maxvalue) {
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if (static_cast<V>(*ptr) > maxvalue) *ptr = maxvalue;
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if (static_cast<V>(*ptr) < minvalue) *ptr = minvalue;
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}
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} // namespace rocksdb
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