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ad96563b79
Summary: This patch allows an application to specify whether to use bufferedio, reads-via-mmaps and writes-via-mmaps per database. Earlier, there was a global static variable that was used to configure this functionality. The default setting remains the same (and is backward compatible): 1. use bufferedio 2. do not use mmaps for reads 3. use mmap for writes 4. use readaheads for reads needed for compaction I also added a parameter to db_bench to be able to explicitly specify whether to do readaheads for compactions or not. Test Plan: make check Reviewers: sheki, heyongqiang, MarkCallaghan Reviewed By: sheki CC: leveldb Differential Revision: https://reviews.facebook.net/D9429
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// 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_LEVELDB_DB_BUILDER_H_
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#define STORAGE_LEVELDB_DB_BUILDER_H_
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#include "leveldb/comparator.h"
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#include "leveldb/status.h"
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#include "leveldb/types.h"
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#include "util/storage_options.h"
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namespace leveldb {
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struct Options;
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struct FileMetaData;
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class Env;
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class Iterator;
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class TableCache;
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class VersionEdit;
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// Build a Table file from the contents of *iter. The generated file
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// will be named according to meta->number. On success, the rest of
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// *meta will be filled with metadata about the generated table.
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// If no data is present in *iter, meta->file_size will be set to
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// zero, and no Table file will be produced.
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extern Status BuildTable(const std::string& dbname,
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Env* env,
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const Options& options,
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const StorageOptions& soptions,
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TableCache* table_cache,
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Iterator* iter,
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FileMetaData* meta,
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const Comparator* user_comparator,
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const SequenceNumber newest_snapshot,
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const SequenceNumber earliest_seqno_in_memtable);
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_DB_BUILDER_H_
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