mirror of https://github.com/facebook/rocksdb.git
94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root 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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#ifndef ROCKSDB_LITE
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#include "db/compaction_picker.h"
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namespace rocksdb {
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class UniversalCompactionPicker : public CompactionPicker {
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public:
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UniversalCompactionPicker(const ImmutableCFOptions& ioptions,
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const InternalKeyComparator* icmp)
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: CompactionPicker(ioptions, icmp) {}
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virtual Compaction* PickCompaction(const std::string& cf_name,
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const MutableCFOptions& mutable_cf_options,
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VersionStorageInfo* vstorage,
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LogBuffer* log_buffer) override;
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virtual int MaxOutputLevel() const override { return NumberLevels() - 1; }
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virtual bool NeedsCompaction(
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const VersionStorageInfo* vstorage) const override;
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private:
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struct SortedRun {
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SortedRun(int _level, FileMetaData* _file, uint64_t _size,
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uint64_t _compensated_file_size, bool _being_compacted)
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: level(_level),
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file(_file),
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size(_size),
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compensated_file_size(_compensated_file_size),
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being_compacted(_being_compacted) {
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assert(compensated_file_size > 0);
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assert(level != 0 || file != nullptr);
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}
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void Dump(char* out_buf, size_t out_buf_size,
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bool print_path = false) const;
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// sorted_run_count is added into the string to print
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void DumpSizeInfo(char* out_buf, size_t out_buf_size,
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size_t sorted_run_count) const;
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int level;
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// `file` Will be null for level > 0. For level = 0, the sorted run is
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// for this file.
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FileMetaData* file;
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// For level > 0, `size` and `compensated_file_size` are sum of sizes all
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// files in the level. `being_compacted` should be the same for all files
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// in a non-zero level. Use the value here.
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uint64_t size;
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uint64_t compensated_file_size;
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bool being_compacted;
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};
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// Pick Universal compaction to limit read amplification
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Compaction* PickCompactionToReduceSortedRuns(
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const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
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VersionStorageInfo* vstorage, double score, unsigned int ratio,
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unsigned int num_files, const std::vector<SortedRun>& sorted_runs,
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LogBuffer* log_buffer);
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// Pick Universal compaction to limit space amplification.
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Compaction* PickCompactionToReduceSizeAmp(
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const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
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VersionStorageInfo* vstorage, double score,
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const std::vector<SortedRun>& sorted_runs, LogBuffer* log_buffer);
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// Used in universal compaction when the enabled_trivial_move
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// option is set. Checks whether there are any overlapping files
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// in the input. Returns true if the input files are non
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// overlapping.
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bool IsInputFilesNonOverlapping(Compaction* c);
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static std::vector<SortedRun> CalculateSortedRuns(
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const VersionStorageInfo& vstorage, const ImmutableCFOptions& ioptions,
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const MutableCFOptions& mutable_cf_options);
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// Pick a path ID to place a newly generated file, with its estimated file
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// size.
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static uint32_t GetPathId(const ImmutableCFOptions& ioptions,
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const MutableCFOptions& mutable_cf_options,
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uint64_t file_size);
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};
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} // namespace rocksdb
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#endif // !ROCKSDB_LITE
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