Revision 24eea931efee97ef232ec90b081c1208e27b5ae4 authored by Dhruba Borthakur on 25 September 2012, 16:15:32 UTC, committed by Dhruba Borthakur on 25 September 2012, 18:07:01 UTC
Summary: If ReadCompaction is switched off, then it is better to not even submit background compaction jobs. I see about 3% increase in read-throughput on a pure memory database. Test Plan: run db_bench Reviewers: heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D5673
1 parent 26e0ecb
merger.h
// 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_LEVELDB_TABLE_MERGER_H_
#define STORAGE_LEVELDB_TABLE_MERGER_H_
namespace leveldb {
class Comparator;
class Iterator;
// Return an iterator that provided the union of the data in
// children[0,n-1]. Takes ownership of the child iterators and
// will delete them when the result iterator is deleted.
//
// The result does no duplicate suppression. I.e., if a particular
// key is present in K child iterators, it will be yielded K times.
//
// REQUIRES: n >= 0
extern Iterator* NewMergingIterator(
const Comparator* comparator, Iterator** children, int n);
} // namespace leveldb
#endif // STORAGE_LEVELDB_TABLE_MERGER_H_
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