rocksdb/include/leveldb/universal_compaction.h

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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef STORAGE_ROCKSDB_UNIVERSAL_COMPACTION_OPTIONS_H
#define STORAGE_ROCKSDB_UNIVERSAL_COMPACTION_OPTIONS_H
#include <stddef.h>
#include <string>
#include <memory>
#include <vector>
#include <stdint.h>
#include <climits>
#include "leveldb/slice.h"
#include "leveldb/statistics.h"
namespace leveldb {
//
// Algorithm used to make a compaction request stop picking new files
// into a single compaction run
//
enum CompactionStopStyle {
kCompactionStopStyleSimilarSize, // pick files of similar size
kCompactionStopStyleTotalSize // total size of picked files > next file
};
class CompactionOptionsUniversal {
public:
// Percentage flexibilty while comparing file size. If the candidate file(s)
// size is 1% smaller than the next file's size, then include next file into
// this candidate set. // Default: 1
unsigned int size_ratio;
// The minimum number of files in a single compaction run. Default: 2
unsigned int min_merge_width;
// The maximum number of files in a single compaction run. Default: INT_MAX
unsigned int max_merge_width;
// The algorithm used to stop picking files into a single compaction run
// Default: kCompactionStopStyleTotalSize
CompactionStopStyle stop_style;
// Default set of parameters
CompactionOptionsUniversal() :
size_ratio(1),
min_merge_width(2),
max_merge_width(UINT_MAX),
stop_style(kCompactionStopStyleTotalSize) {
}
};
} // namespace leveldb
#endif // STORAGE_ROCKSDB_UNIVERSAL_COMPACTION_OPTIONS_H