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https://github.com/facebook/rocksdb.git
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3c840d1a6d
Summary: Allow user to reduce number of levels in LSM by issue a full CompactRange() and put the result in a lower level, and then reopen DB with reduced options.num_levels. Previous this will fail on reopen on when recovery replaying the previous MANIFEST and found a historical file was on a higher level than the new options.num_levels. The workaround was after CompactRange(), reopen the DB with old num_levels, which will create a new MANIFEST, and then reopen the DB again with new num_levels. This patch relax the check of levels during recovery. It allows DB to open if there was a historical file on level > options.num_levels, but was also deleted. Closes https://github.com/facebook/rocksdb/pull/2740 Differential Revision: D5629354 Pulled By: yiwu-arbug fbshipit-source-id: 545903f6b36b6083e8cbaf777176aef2f488021d
46 lines
1.6 KiB
C++
46 lines
1.6 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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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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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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