fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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630 lines
24 KiB
630 lines
24 KiB
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <atomic>
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#include <deque>
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#include <limits>
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#include <set>
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#include <utility>
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#include <vector>
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#include <string>
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#include "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 "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 "db/internal_stats.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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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::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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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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// 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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#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, const Slice* begin,
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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(ColumnFamilyHandle* column_family =
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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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// Trigger's a background call for testing.
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void TEST_PurgeObsoleteteWAL();
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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_SetDefaultTimeToCheck(uint64_t default_interval_to_delete_obsolete_WAL)
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{
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default_interval_to_delete_obsolete_WAL_ = default_interval_to_delete_obsolete_WAL;
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}
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void TEST_GetFilesMetaData(ColumnFamilyHandle* column_family,
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std::vector<std::vector<FileMetaData>>* metadata);
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Status TEST_ReadFirstRecord(const WalFileType type, const uint64_t number,
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SequenceNumber* sequence);
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Status TEST_ReadFirstLine(const std::string& fname, SequenceNumber* sequence);
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#endif // NDEBUG
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// Structure to store information for candidate files to delete.
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struct CandidateFileInfo {
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std::string file_name;
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uint32_t path_id;
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CandidateFileInfo(std::string name, uint32_t path)
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: file_name(name), path_id(path) {}
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bool operator==(const CandidateFileInfo& other) const {
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return file_name == other.file_name && path_id == other.path_id;
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}
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};
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// needed for CleanupIteratorState
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struct DeletionState {
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inline bool HaveSomethingToDelete() const {
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return candidate_files.size() ||
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sst_delete_files.size() ||
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log_delete_files.size();
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}
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// a list of all files that we'll consider deleting
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// (every once in a while this is filled up with all files
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// in the DB directory)
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std::vector<CandidateFileInfo> candidate_files;
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// the list of all live sst files that cannot be deleted
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std::vector<FileDescriptor> sst_live;
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// a list of sst files that we need to delete
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std::vector<FileMetaData*> sst_delete_files;
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// a list of log files that we need to delete
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std::vector<uint64_t> log_delete_files;
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// a list of memtables to be free
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autovector<MemTable*> memtables_to_free;
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autovector<SuperVersion*> superversions_to_free;
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SuperVersion* new_superversion; // if nullptr no new superversion
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// the current manifest_file_number, log_number and prev_log_number
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// that corresponds to the set of files in 'live'.
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uint64_t manifest_file_number, pending_manifest_file_number, log_number,
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prev_log_number;
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explicit DeletionState(bool create_superversion = false) {
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manifest_file_number = 0;
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pending_manifest_file_number = 0;
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log_number = 0;
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prev_log_number = 0;
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new_superversion = create_superversion ? new SuperVersion() : nullptr;
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}
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~DeletionState() {
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// free pending memtables
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for (auto m : memtables_to_free) {
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delete m;
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}
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// free superversions
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for (auto s : superversions_to_free) {
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delete s;
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}
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// if new_superversion was not used, it will be non-nullptr and needs
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// to be freed here
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delete new_superversion;
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}
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};
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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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// options_.delete_obsolete_files_period_micros microseconds ago,
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// it will not fill up the deletion_state
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void FindObsoleteFiles(DeletionState& deletion_state,
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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(DeletionState& deletion_state);
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ColumnFamilyHandle* DefaultColumnFamily() const;
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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 options_;
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Iterator* NewInternalIterator(const ReadOptions&, ColumnFamilyData* cfd,
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SuperVersion* super_version,
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Arena* arena = nullptr);
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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 TailingIterator;
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friend class ForwardIterator;
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#endif
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friend struct SuperVersion;
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struct CompactionState;
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struct Writer;
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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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// 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, bool* madeProgress,
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DeletionState& deletion_state,
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LogBuffer* log_buffer);
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Status RecoverLogFile(uint64_t log_number, SequenceNumber* max_sequence,
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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 WriteLevel0Table(ColumnFamilyData* cfd, autovector<MemTable*>& mems,
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VersionEdit* edit, uint64_t* filenumber,
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LogBuffer* log_buffer);
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uint64_t SlowdownAmount(int n, double bottom, double top);
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// TODO(icanadi) free superversion_to_free and old_log outside of mutex
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Status MakeRoomForWrite(ColumnFamilyData* cfd,
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bool force /* flush even if there is room? */,
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autovector<SuperVersion*>* superversions_to_free,
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autovector<log::Writer*>* logs_to_free,
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uint64_t expiration_time);
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void BuildBatchGroup(Writer** last_writer,
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autovector<WriteBatch*>* write_batch_group);
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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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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, DeletionState& deletion_state,
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LogBuffer* log_buffer);
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Status BackgroundFlush(bool* madeProgress, DeletionState& deletion_state,
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LogBuffer* log_buffer);
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void CleanupCompaction(CompactionState* compact, Status status);
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Status DoCompactionWork(CompactionState* compact,
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DeletionState& deletion_state,
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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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// Returns: micros spent executing
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uint64_t CallFlushDuringCompaction(ColumnFamilyData* cfd,
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DeletionState& deletion_state,
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LogBuffer* log_buffer);
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// Call compaction filter if is_compaction_v2 is not true. Then iterate
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// through input and compact the kv-pairs
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Status ProcessKeyValueCompaction(
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bool is_snapshot_supported,
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SequenceNumber visible_at_tip,
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SequenceNumber earliest_snapshot,
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SequenceNumber latest_snapshot,
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DeletionState& deletion_state,
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bool bottommost_level,
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int64_t& imm_micros,
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Iterator* input,
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CompactionState* compact,
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bool is_compaction_v2,
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LogBuffer* log_buffer);
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// Call compaction_filter_v2->Filter() on kv-pairs in compact
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void CallCompactionFilterV2(CompactionState* compact,
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CompactionFilterV2* compaction_filter_v2);
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Status OpenCompactionOutputFile(CompactionState* compact);
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Status FinishCompactionOutputFile(CompactionState* compact, Iterator* input);
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Status InstallCompactionResults(CompactionState* compact,
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LogBuffer* log_buffer);
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void AllocateCompactionOutputFileNumbers(CompactionState* compact);
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void ReleaseCompactionUnusedFileNumbers(CompactionState* compact);
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#ifdef ROCKSDB_LITE
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void PurgeObsoleteWALFiles() {
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// this function is used for archiving WAL files. we don't need this in
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// ROCKSDB_LITE
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}
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#else
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void PurgeObsoleteWALFiles();
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Status GetSortedWalsOfType(const std::string& path,
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VectorLogPtr& log_files,
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WalFileType type);
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// Requires: all_logs should be sorted with earliest log file first
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// Retains all log files in all_logs which contain updates with seq no.
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// Greater Than or Equal to the requested SequenceNumber.
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Status RetainProbableWalFiles(VectorLogPtr& all_logs,
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const SequenceNumber target);
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Status ReadFirstRecord(const WalFileType type, const uint64_t number,
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SequenceNumber* sequence);
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Status ReadFirstLine(const std::string& fname, SequenceNumber* sequence);
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#endif // ROCKSDB_LITE
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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 true if the current db supports snapshot. If the current
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// DB does not support snapshot, then calling GetSnapshot() will always
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// return nullptr.
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//
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// @see GetSnapshot()
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virtual bool IsSnapshotSupported() const;
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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, 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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port::AtomicPointer 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
|
|
// [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_;
|
|
|
|
std::unique_ptr<Directory> db_directory_;
|
|
|
|
// Queue of writers.
|
|
std::deque<Writer*> writers_;
|
|
WriteBatch tmp_batch_;
|
|
|
|
SnapshotList snapshots_;
|
|
|
|
// cache for ReadFirstRecord() calls
|
|
std::unordered_map<uint64_t, SequenceNumber> read_first_record_cache_;
|
|
port::Mutex read_first_record_cache_mutex_;
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|
|
|
// Set of table files to protect from deletion because they are
|
|
// part of ongoing compactions.
|
|
// map from pending file number ID to their path IDs.
|
|
FileNumToPathIdMap pending_outputs_;
|
|
|
|
// At least one compaction or flush job is pending but not yet scheduled
|
|
// because of the max background thread limit.
|
|
bool bg_schedule_needed_;
|
|
|
|
// count how many background compactions are running or have been scheduled
|
|
int bg_compaction_scheduled_;
|
|
|
|
// If non-zero, MaybeScheduleFlushOrCompaction() will only schedule manual
|
|
// compactions (if manual_compaction_ is not null). This mechanism enables
|
|
// manual compactions to wait until all other compactions are finished.
|
|
int bg_manual_only_;
|
|
|
|
// number of background memtable flush jobs, submitted to the HIGH pool
|
|
int bg_flush_scheduled_;
|
|
|
|
// Information for a manual compaction
|
|
struct ManualCompaction {
|
|
ColumnFamilyData* cfd;
|
|
int input_level;
|
|
int output_level;
|
|
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 when PurgeObsoleteWALFiles ran.
|
|
uint64_t purge_wal_files_last_run_;
|
|
|
|
// last time stats were dumped to LOG
|
|
std::atomic<uint64_t> last_stats_dump_time_microsec_;
|
|
|
|
// obsolete files will be deleted every this seconds if ttl deletion is
|
|
// enabled and archive size_limit is disabled.
|
|
uint64_t default_interval_to_delete_obsolete_WAL_;
|
|
|
|
bool flush_on_destroy_; // Used when disableWAL is true.
|
|
|
|
static const int KEEP_LOG_FILE_NUM = 1000;
|
|
static const uint64_t kNoTimeOut = std::numeric_limits<uint64_t>::max();
|
|
std::string db_absolute_path_;
|
|
|
|
// count of the number of contiguous delaying writes
|
|
int delayed_writes_;
|
|
|
|
// The options to access storage files
|
|
const EnvOptions storage_options_;
|
|
|
|
// 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_;
|
|
|
|
// No copying allowed
|
|
DBImpl(const DBImpl&);
|
|
void operator=(const DBImpl&);
|
|
|
|
// dump the delayed_writes_ to the log file and reset counter.
|
|
void DelayLoggingAndReset();
|
|
|
|
// 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 cfd->InstallSuperVersion() function. Background threads carry
|
|
// deletion_state which can have new_superversion already allocated.
|
|
void InstallSuperVersion(ColumnFamilyData* cfd,
|
|
DeletionState& deletion_state);
|
|
|
|
#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);
|
|
};
|
|
|
|
// 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 InternalFilterPolicy* ipolicy,
|
|
const Options& src);
|
|
extern DBOptions SanitizeOptions(const std::string& db, const DBOptions& src);
|
|
|
|
} // namespace rocksdb
|
|
|