cadc1adffa
Summary: We added multiple fields to FileMetaData recently and are planning to add more. This refactoring separate the minimum information for accessing the file. This object is copyable (FileMetaData is not copyable since the ref counter). I hope this refactoring can enable further improvements: (1) use it to design a more efficient data structure to speed up read queries. (2) in the future, when we add information of storage level, we can easily do the encoding, instead of enlarge this structure, which might expand memory work set for file meta data. The definition is same as current EncodedFileMetaData used in two level iterator, so now the logic in two level iterator is easier to understand. Test Plan: make all check Reviewers: haobo, igor, ljin Reviewed By: ljin Subscribers: leveldb, dhruba, yhchiang Differential Revision: https://reviews.facebook.net/D18933
46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
// 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.
|
|
#pragma once
|
|
#include "rocksdb/comparator.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/types.h"
|
|
#include "rocksdb/options.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
struct Options;
|
|
struct FileMetaData;
|
|
|
|
class Env;
|
|
struct EnvOptions;
|
|
class Iterator;
|
|
class TableCache;
|
|
class VersionEdit;
|
|
class TableBuilder;
|
|
class WritableFile;
|
|
|
|
extern TableBuilder* NewTableBuilder(
|
|
const Options& options, const InternalKeyComparator& internal_comparator,
|
|
WritableFile* file, CompressionType compression_type);
|
|
|
|
// Build a Table file from the contents of *iter. The generated file
|
|
// will be named according to number specified in meta. On success, the rest of
|
|
// *meta will be filled with metadata about the generated table.
|
|
// If no data is present in *iter, meta->file_size will be set to
|
|
// zero, and no Table file will be produced.
|
|
extern Status BuildTable(const std::string& dbname, Env* env,
|
|
const Options& options, const EnvOptions& soptions,
|
|
TableCache* table_cache, Iterator* iter,
|
|
FileMetaData* meta,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const SequenceNumber newest_snapshot,
|
|
const SequenceNumber earliest_seqno_in_memtable,
|
|
const CompressionType compression);
|
|
|
|
} // namespace rocksdb
|