mirror of
https://github.com/facebook/rocksdb.git
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d7a486668c
Summary: Now DB::GetSnapshot() doesn't scale to more column families, as it needs to go through all the column families to find whether snapshot is supported. This patch optimizes it. Test Plan: Add unit tests to cover negative cases. make all check Reviewers: yhchiang, rven, igor Reviewed By: igor Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D30093
603 lines
23 KiB
C++
603 lines
23 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 <list>
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#include <utility>
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#include <list>
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#include <vector>
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#include <string>
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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/wal_manager.h"
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#include "db/writebuffer.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 "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 "util/hash.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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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 CompactionFilterV2;
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class Arena;
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struct JobContext;
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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);
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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);
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using DB::Delete;
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virtual Status Delete(const WriteOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key);
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using DB::Write;
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virtual Status Write(const WriteOptions& options, WriteBatch* updates);
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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);
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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, std::vector<std::string>* values);
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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);
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virtual Status DropColumnFamily(ColumnFamilyHandle* column_family);
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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, bool* value_found = nullptr);
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using DB::NewIterator;
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virtual Iterator* NewIterator(const ReadOptions& options,
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ColumnFamilyHandle* column_family);
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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);
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virtual const Snapshot* GetSnapshot();
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virtual void ReleaseSnapshot(const Snapshot* snapshot);
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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);
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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::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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using DB::CompactRange;
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virtual Status CompactRange(ColumnFamilyHandle* column_family,
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const Slice* begin, const Slice* end,
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bool reduce_level = false, int target_level = -1,
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uint32_t target_path_id = 0);
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using DB::CompactFiles;
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virtual Status CompactFiles(
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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, const int output_path_id = -1);
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using DB::SetOptions;
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Status SetOptions(ColumnFamilyHandle* column_family,
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const std::unordered_map<std::string, std::string>& options_map);
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using DB::NumberLevels;
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virtual int NumberLevels(ColumnFamilyHandle* column_family);
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using DB::MaxMemCompactionLevel;
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virtual int MaxMemCompactionLevel(ColumnFamilyHandle* column_family);
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using DB::Level0StopWriteTrigger;
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virtual int Level0StopWriteTrigger(ColumnFamilyHandle* column_family);
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virtual const std::string& GetName() const;
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virtual Env* GetEnv() const;
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using DB::GetOptions;
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virtual const Options& GetOptions(ColumnFamilyHandle* column_family) const;
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using DB::Flush;
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virtual Status Flush(const FlushOptions& options,
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ColumnFamilyHandle* column_family);
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virtual SequenceNumber GetLatestSequenceNumber() const;
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#ifndef ROCKSDB_LITE
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virtual Status DisableFileDeletions();
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virtual Status EnableFileDeletions(bool force);
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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);
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virtual Status GetSortedWalFiles(VectorLogPtr& files);
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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());
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virtual Status DeleteFile(std::string name);
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virtual void GetLiveFilesMetaData(std::vector<LiveFileMetaData>* metadata);
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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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#endif // ROCKSDB_LITE
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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);
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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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#ifndef ROCKSDB_LITE
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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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// Force current memtable contents to be flushed.
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Status TEST_FlushMemTable(bool wait = true);
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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 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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Iterator* TEST_NewInternalIterator(
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Arena* arena, ColumnFamilyHandle* column_family = nullptr);
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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_max_total_in_memory_state() {
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return max_total_in_memory_state_;
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}
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#endif // ROCKSDB_LITE
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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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ColumnFamilyHandle* DefaultColumnFamily() const;
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const SnapshotList& snapshots() const { return snapshots_; }
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protected:
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Env* const env_;
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const std::string dbname_;
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unique_ptr<VersionSet> versions_;
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const DBOptions db_options_;
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Statistics* stats_;
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Iterator* NewInternalIterator(const ReadOptions&, ColumnFamilyData* cfd,
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SuperVersion* super_version, Arena* arena);
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void NotifyOnFlushCompleted(ColumnFamilyData* cfd, uint64_t file_number,
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const MutableCFOptions& mutable_cf_options);
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void NewThreadStatusCfInfo(ColumnFamilyData* cfd) const;
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void EraseThreadStatusCfInfo(ColumnFamilyData* cfd) const;
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void EraseThreadStatusDbInfo() const;
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private:
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friend class DB;
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friend class InternalStats;
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#ifndef ROCKSDB_LITE
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friend class ForwardIterator;
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#endif
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friend struct SuperVersion;
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friend class CompactedDBImpl;
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struct CompactionState;
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struct WriteContext;
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Status NewDB();
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// Recover the descriptor from persistent storage. May do a significant
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// amount of work to recover recently logged updates. Any changes to
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// be made to the descriptor are added to *edit.
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Status Recover(const std::vector<ColumnFamilyDescriptor>& column_families,
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bool read_only = false, bool error_if_log_file_exist = false);
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void MaybeIgnoreError(Status* s) const;
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const Status CreateArchivalDirectory();
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// Delete any unneeded files and stale in-memory entries.
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void DeleteObsoleteFiles();
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// Background process needs to call
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// auto x = CaptureCurrentFileNumberInPendingOutputs()
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// <do something>
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// ReleaseFileNumberFromPendingOutputs(x)
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// This will protect any temporary files created while <do something> is
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// executing from being deleted.
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// -----------
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// This function will capture current file number and append it to
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// pending_outputs_. This will prevent any background process to delete any
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// file created after this point.
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std::list<uint64_t>::iterator CaptureCurrentFileNumberInPendingOutputs();
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// This function should be called with the result of
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// CaptureCurrentFileNumberInPendingOutputs(). It then marks that any file
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// created between the calls CaptureCurrentFileNumberInPendingOutputs() and
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// ReleaseFileNumberFromPendingOutputs() can now be deleted (if it's not live
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// and blocked by any other pending_outputs_ calls)
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void ReleaseFileNumberFromPendingOutputs(std::list<uint64_t>::iterator v);
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// Flush the in-memory write buffer to storage. Switches to a new
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// log-file/memtable and writes a new descriptor iff successful.
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Status FlushMemTableToOutputFile(ColumnFamilyData* cfd,
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const MutableCFOptions& mutable_cf_options,
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bool* madeProgress, JobContext* job_context,
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LogBuffer* log_buffer);
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// REQUIRES: log_numbers are sorted in ascending order
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Status RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
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SequenceNumber* max_sequence, bool read_only);
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// The following two methods are used to flush a memtable to
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// storage. The first one is used atdatabase RecoveryTime (when the
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// database is opened) and is heavyweight because it holds the mutex
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// for the entire period. The second method WriteLevel0Table supports
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// concurrent flush memtables to storage.
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Status WriteLevel0TableForRecovery(ColumnFamilyData* cfd, MemTable* mem,
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VersionEdit* edit);
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Status DelayWrite(uint64_t expiration_time);
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Status ScheduleFlushes(WriteContext* context);
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Status SetNewMemtableAndNewLogFile(ColumnFamilyData* cfd,
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WriteContext* context);
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// Force current memtable contents to be flushed.
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Status FlushMemTable(ColumnFamilyData* cfd, const FlushOptions& options);
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// Wait for memtable flushed
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Status WaitForFlushMemTable(ColumnFamilyData* cfd);
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void RecordFlushIOStats();
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void RecordCompactionIOStats();
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#ifndef ROCKSDB_LITE
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Status CompactFilesImpl(
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const CompactionOptions& compact_options, ColumnFamilyData* cfd,
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Version* version, const std::vector<std::string>& input_file_names,
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const int output_level, int output_path_id);
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#endif // ROCKSDB_LITE
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ColumnFamilyData* GetColumnFamilyDataByName(const std::string& cf_name);
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void MaybeScheduleFlushOrCompaction();
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static void BGWorkCompaction(void* db);
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static void BGWorkFlush(void* db);
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void BackgroundCallCompaction();
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void BackgroundCallFlush();
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Status BackgroundCompaction(bool* madeProgress, JobContext* job_context,
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LogBuffer* log_buffer);
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Status BackgroundFlush(bool* madeProgress, JobContext* job_context,
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LogBuffer* log_buffer);
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// This function is called as part of compaction. It enables Flush process to
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// preempt compaction, since it's higher prioirty
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uint64_t CallFlushDuringCompaction(ColumnFamilyData* cfd,
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const MutableCFOptions& mutable_cf_options,
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JobContext* job_context,
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LogBuffer* log_buffer);
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void PrintStatistics();
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// dump rocksdb.stats to LOG
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void MaybeDumpStats();
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// Return the minimum empty level that could hold the total data in the
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// input level. Return the input level, if such level could not be found.
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int FindMinimumEmptyLevelFitting(ColumnFamilyData* cfd,
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const MutableCFOptions& mutable_cf_options, int level);
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// Move the files in the input level to the target level.
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// If target_level < 0, automatically calculate the minimum level that could
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// hold the data set.
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Status ReFitLevel(ColumnFamilyData* cfd, int level, int target_level = -1);
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// table_cache_ provides its own synchronization
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std::shared_ptr<Cache> table_cache_;
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// Lock over the persistent DB state. Non-nullptr iff successfully acquired.
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FileLock* db_lock_;
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// State below is protected by mutex_
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port::Mutex mutex_;
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std::atomic<bool> shutting_down_;
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// This condition variable is signaled on these conditions:
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// * whenever bg_compaction_scheduled_ goes down to 0
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// * if bg_manual_only_ > 0, whenever a compaction finishes, even if it hasn't
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// made any progress
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// * whenever a compaction made any progress
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// * whenever bg_flush_scheduled_ value decreases (i.e. whenever a flush is
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// done, even if it didn't make any progress)
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// * whenever there is an error in background flush or compaction
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port::CondVar bg_cv_;
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uint64_t logfile_number_;
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unique_ptr<log::Writer> log_;
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bool log_empty_;
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ColumnFamilyHandleImpl* default_cf_handle_;
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InternalStats* default_cf_internal_stats_;
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unique_ptr<ColumnFamilyMemTablesImpl> column_family_memtables_;
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struct LogFileNumberSize {
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explicit LogFileNumberSize(uint64_t _number)
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: number(_number), size(0), getting_flushed(false) {}
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void AddSize(uint64_t new_size) { size += new_size; }
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uint64_t number;
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uint64_t size;
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bool getting_flushed;
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};
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std::deque<LogFileNumberSize> alive_log_files_;
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uint64_t total_log_size_;
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// only used for dynamically adjusting max_total_wal_size. it is a sum of
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// [write_buffer_size * max_write_buffer_number] over all column families
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uint64_t max_total_in_memory_state_;
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// If true, we have only one (default) column family. We use this to optimize
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// some code-paths
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bool single_column_family_mode_;
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bool is_snapshot_supported_;
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std::unique_ptr<Directory> db_directory_;
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WriteBuffer write_buffer_;
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WriteThread write_thread_;
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WriteBatch tmp_batch_;
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WriteController write_controller_;
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FlushScheduler flush_scheduler_;
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SnapshotList snapshots_;
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// For each background job, pending_outputs_ keeps the current file number at
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// the time that background job started.
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// FindObsoleteFiles()/PurgeObsoleteFiles() never deletes any file that has
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// number bigger than any of the file number in pending_outputs_. Since file
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// numbers grow monotonically, this also means that pending_outputs_ is always
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// sorted. After a background job is done executing, its file number is
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// deleted from pending_outputs_, which allows PurgeObsoleteFiles() to clean
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// it up.
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// State is protected with db mutex.
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std::list<uint64_t> pending_outputs_;
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// At least one compaction or flush job is pending but not yet scheduled
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// because of the max background thread limit.
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bool bg_schedule_needed_;
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// count how many background compactions are running or have been scheduled
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int bg_compaction_scheduled_;
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// If non-zero, MaybeScheduleFlushOrCompaction() will only schedule manual
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// compactions (if manual_compaction_ is not null). This mechanism enables
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// manual compactions to wait until all other compactions are finished.
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int bg_manual_only_;
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// number of background memtable flush jobs, submitted to the HIGH pool
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int bg_flush_scheduled_;
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// Information for a manual compaction
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struct ManualCompaction {
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ColumnFamilyData* cfd;
|
|
int input_level;
|
|
int output_level;
|
|
uint32_t output_path_id;
|
|
bool done;
|
|
Status status;
|
|
bool in_progress; // compaction request being processed?
|
|
const InternalKey* begin; // nullptr means beginning of key range
|
|
const InternalKey* end; // nullptr means end of key range
|
|
InternalKey tmp_storage; // Used to keep track of compaction progress
|
|
};
|
|
ManualCompaction* manual_compaction_;
|
|
|
|
// 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_;
|
|
|
|
// last time when DeleteObsoleteFiles was invoked
|
|
uint64_t delete_obsolete_files_last_run_;
|
|
|
|
// last time stats were dumped to LOG
|
|
std::atomic<uint64_t> last_stats_dump_time_microsec_;
|
|
|
|
bool flush_on_destroy_; // Used when disableWAL is true.
|
|
|
|
static const int KEEP_LOG_FILE_NUM = 1000;
|
|
std::string db_absolute_path_;
|
|
|
|
// The options to access storage files
|
|
const EnvOptions env_options_;
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
WalManager wal_manager_;
|
|
#endif // ROCKSDB_LITE
|
|
|
|
// A value of true temporarily disables scheduling of background work
|
|
bool bg_work_gate_closed_;
|
|
|
|
// Guard against multiple concurrent refitting
|
|
bool refitting_level_;
|
|
|
|
// Indicate DB was opened successfully
|
|
bool opened_successfully_;
|
|
|
|
// The list of registered event listeners.
|
|
std::list<EventListener*> listeners_;
|
|
|
|
// count how many events are currently being notified.
|
|
int notifying_events_;
|
|
|
|
// No copying allowed
|
|
DBImpl(const DBImpl&);
|
|
void operator=(const DBImpl&);
|
|
|
|
// Return the earliest snapshot where seqno is visible.
|
|
// Store the snapshot right before that, if any, in prev_snapshot
|
|
inline SequenceNumber findEarliestVisibleSnapshot(
|
|
SequenceNumber in,
|
|
std::vector<SequenceNumber>& snapshots,
|
|
SequenceNumber* prev_snapshot);
|
|
|
|
// Background threads call this function, which is just a wrapper around
|
|
// the InstallSuperVersion() function. Background threads carry
|
|
// job_context which can have new_superversion already
|
|
// allocated.
|
|
void InstallSuperVersionBackground(
|
|
ColumnFamilyData* cfd, JobContext* job_context,
|
|
const MutableCFOptions& mutable_cf_options);
|
|
|
|
SuperVersion* InstallSuperVersion(
|
|
ColumnFamilyData* cfd, SuperVersion* new_sv,
|
|
const MutableCFOptions& mutable_cf_options);
|
|
|
|
// Find Super version and reference it. Based on options, it might return
|
|
// the thread local cached one.
|
|
inline SuperVersion* GetAndRefSuperVersion(ColumnFamilyData* cfd);
|
|
|
|
// Un-reference the super version and return it to thread local cache if
|
|
// needed. If it is the last reference of the super version. Clean it up
|
|
// after un-referencing it.
|
|
inline void ReturnAndCleanupSuperVersion(ColumnFamilyData* cfd,
|
|
SuperVersion* sv);
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
using DB::GetPropertiesOfAllTables;
|
|
virtual Status GetPropertiesOfAllTables(ColumnFamilyHandle* column_family,
|
|
TablePropertiesCollection* props)
|
|
override;
|
|
#endif // ROCKSDB_LITE
|
|
|
|
// Function that Get and KeyMayExist call with no_io true or false
|
|
// Note: 'value_found' from KeyMayExist propagates here
|
|
Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
|
|
const Slice& key, std::string* value,
|
|
bool* value_found = nullptr);
|
|
|
|
bool GetIntPropertyInternal(ColumnFamilyHandle* column_family,
|
|
DBPropertyType property_type,
|
|
bool need_out_of_mutex, uint64_t* value);
|
|
};
|
|
|
|
// Sanitize db options. The caller should delete result.info_log if
|
|
// it is not equal to src.info_log.
|
|
extern Options SanitizeOptions(const std::string& db,
|
|
const InternalKeyComparator* icmp,
|
|
const Options& src);
|
|
extern DBOptions SanitizeOptions(const std::string& db, const DBOptions& src);
|
|
|
|
// Fix user-supplied options to be reasonable
|
|
template <class T, class V>
|
|
static void ClipToRange(T* ptr, V minvalue, V maxvalue) {
|
|
if (static_cast<V>(*ptr) > maxvalue) *ptr = maxvalue;
|
|
if (static_cast<V>(*ptr) < minvalue) *ptr = minvalue;
|
|
}
|
|
|
|
} // namespace rocksdb
|