f0dda35d7d
Summary: Choose to preload some files if options.max_open_files != -1. This can slightly narrow the gap of performance between options.max_open_files is -1 and a large number. To avoid a significant regression to DB reopen speed if options.max_open_files != -1. Limit the files to preload in DB open time to 16. Pull Request resolved: https://github.com/facebook/rocksdb/pull/3340 Differential Revision: D6686945 Pulled By: siying fbshipit-source-id: 8ec11bbdb46e3d0cdee7b6ad5897a09c5a07869f
49 lines
1.8 KiB
C++
49 lines
1.8 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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//
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#pragma once
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#include "rocksdb/env.h"
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#include "rocksdb/slice_transform.h"
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namespace rocksdb {
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class TableCache;
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class VersionStorageInfo;
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class VersionEdit;
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struct FileMetaData;
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class InternalStats;
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// A helper class so we can efficiently apply a whole sequence
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// of edits to a particular state without creating intermediate
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// Versions that contain full copies of the intermediate state.
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class VersionBuilder {
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public:
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VersionBuilder(const EnvOptions& env_options, TableCache* table_cache,
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VersionStorageInfo* base_vstorage, Logger* info_log = nullptr);
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~VersionBuilder();
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void CheckConsistency(VersionStorageInfo* vstorage);
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void CheckConsistencyForDeletes(VersionEdit* edit, uint64_t number,
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int level);
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bool CheckConsistencyForNumLevels();
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void Apply(VersionEdit* edit);
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void SaveTo(VersionStorageInfo* vstorage);
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void LoadTableHandlers(InternalStats* internal_stats, int max_threads,
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bool prefetch_index_and_filter_in_cache,
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bool is_initial_load,
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const SliceTransform* prefix_extractor);
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void MaybeAddFile(VersionStorageInfo* vstorage, int level, FileMetaData* f);
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private:
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class Rep;
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Rep* rep_;
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};
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extern bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b);
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} // namespace rocksdb
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