58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
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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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#ifndef STORAGE_ROCKSDB_UNIVERSAL_COMPACTION_OPTIONS_H
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#define STORAGE_ROCKSDB_UNIVERSAL_COMPACTION_OPTIONS_H
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#include <stddef.h>
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#include <string>
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#include <memory>
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#include <vector>
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#include <stdint.h>
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#include <climits>
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#include "leveldb/slice.h"
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#include "leveldb/statistics.h"
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namespace leveldb {
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//
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// Algorithm used to make a compaction request stop picking new files
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// into a single compaction run
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//
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enum CompactionStopStyle {
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kCompactionStopStyleSimilarSize, // pick files of similar size
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kCompactionStopStyleTotalSize // total size of picked files > next file
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};
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class CompactionOptionsUniversal {
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public:
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// Percentage flexibilty while comparing file size. If the candidate file(s)
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// size is 1% smaller than the next file's size, then include next file into
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// this candidate set. // Default: 1
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unsigned int size_ratio;
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// The minimum number of files in a single compaction run. Default: 2
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unsigned int min_merge_width;
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// The maximum number of files in a single compaction run. Default: INT_MAX
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unsigned int max_merge_width;
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// The algorithm used to stop picking files into a single compaction run
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// Default: kCompactionStopStyleTotalSize
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CompactionStopStyle stop_style;
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// Default set of parameters
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CompactionOptionsUniversal() :
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size_ratio(1),
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min_merge_width(2),
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max_merge_width(UINT_MAX),
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stop_style(kCompactionStopStyleTotalSize) {
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}
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};
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} // namespace leveldb
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#endif // STORAGE_ROCKSDB_UNIVERSAL_COMPACTION_OPTIONS_H
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