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rocksdb/include/rocksdb/metadata.h

103 lines
3.4 KiB

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <stdint.h>
#include <limits>
#include <string>
#include <vector>
#include "rocksdb/types.h"
namespace rocksdb {
struct ColumnFamilyMetaData;
struct LevelMetaData;
struct SstFileMetaData;
// The metadata that describes a column family.
struct ColumnFamilyMetaData {
ColumnFamilyMetaData() : size(0), file_count(0), name("") {}
ColumnFamilyMetaData(const std::string& _name, uint64_t _size,
const std::vector<LevelMetaData>&& _levels) :
size(_size), name(_name), levels(_levels) {}
// The size of this column family in bytes, which is equal to the sum of
// the file size of its "levels".
uint64_t size;
// The number of files in this column family.
size_t file_count;
// The name of the column family.
std::string name;
// The metadata of all levels in this column family.
std::vector<LevelMetaData> levels;
};
// The metadata that describes a level.
struct LevelMetaData {
LevelMetaData(int _level, uint64_t _size,
const std::vector<SstFileMetaData>&& _files) :
level(_level), size(_size),
files(_files) {}
// The level which this meta data describes.
const int level;
// The size of this level in bytes, which is equal to the sum of
// the file size of its "files".
const uint64_t size;
// The metadata of all sst files in this level.
const std::vector<SstFileMetaData> files;
};
// The metadata that describes a SST file.
struct SstFileMetaData {
SstFileMetaData()
: size(0),
name(""),
db_path(""),
smallest_seqno(0),
largest_seqno(0),
smallestkey(""),
largestkey(""),
num_reads_sampled(0),
being_compacted(false) {}
SstFileMetaData(const std::string& _file_name, const std::string& _path,
size_t _size, SequenceNumber _smallest_seqno,
SequenceNumber _largest_seqno,
const std::string& _smallestkey,
const std::string& _largestkey, uint64_t _num_reads_sampled,
bool _being_compacted)
: size(_size),
name(_file_name),
db_path(_path),
smallest_seqno(_smallest_seqno),
largest_seqno(_largest_seqno),
smallestkey(_smallestkey),
largestkey(_largestkey),
num_reads_sampled(_num_reads_sampled),
being_compacted(_being_compacted) {}
// File size in bytes.
size_t size;
// The name of the file.
std::string name;
// The full path where the file locates.
std::string db_path;
SequenceNumber smallest_seqno; // Smallest sequence number in file.
SequenceNumber largest_seqno; // Largest sequence number in file.
std::string smallestkey; // Smallest user defined key in the file.
std::string largestkey; // Largest user defined key in the file.
uint64_t num_reads_sampled; // How many times the file is read.
bool being_compacted; // true if the file is currently being compacted.
};
// The full set of metadata associated with each SST file.
struct LiveFileMetaData : SstFileMetaData {
std::string column_family_name; // Name of the column family
int level; // Level at which this file resides.
};
} // namespace rocksdb