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// 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_NAMESPACE {
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),
file_number(0),
smallest_seqno(0),
largest_seqno(0),
num_reads_sampled(0),
being_compacted(false),
num_entries(0),
num_deletions(0),
oldest_blob_file_number(0) {}
SstFileMetaData(const std::string& _file_name, uint64_t _file_number,
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, uint64_t _oldest_blob_file_number,
uint64_t _oldest_ancester_time, uint64_t _file_creation_time,
std::string& _file_checksum,
std::string& _file_checksum_func_name)
: size(_size),
name(_file_name),
file_number(_file_number),
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),
num_entries(0),
num_deletions(0),
oldest_blob_file_number(_oldest_blob_file_number),
oldest_ancester_time(_oldest_ancester_time),
file_creation_time(_file_creation_time),
file_checksum(_file_checksum),
file_checksum_func_name(_file_checksum_func_name) {}
// File size in bytes.
size_t size;
// The name of the file.
std::string name;
// The id of the file.
uint64_t file_number;
// 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.
uint64_t num_entries;
uint64_t num_deletions;
uint64_t oldest_blob_file_number; // The id of the oldest blob file
// referenced by the file.
// An SST file may be generated by compactions whose input files may
// in turn be generated by earlier compactions. The creation time of the
// oldest SST file that is the compaction ancester of this file.
// The timestamp is provided Env::GetCurrentTime().
// 0 if the information is not available.
uint64_t oldest_ancester_time;
// Timestamp when the SST file is created, provided by Env::GetCurrentTime().
// 0 if the information is not available.
uint64_t file_creation_time;
// The checksum of a SST file, the value is decided by the file content and
// the checksum algorithm used for this SST file. The checksum function is
// identified by the file_checksum_func_name. If the checksum function is
// not specified, file_checksum is "0" by default.
std::string file_checksum;
// The name of the checksum function used to generate the file checksum
// value. If file checksum is not enabled (e.g., sst_file_checksum_func is
// null), file_checksum_func_name is UnknownFileChecksumFuncName, which is
// "Unknown".
std::string file_checksum_func_name;
};
// 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.
LiveFileMetaData() : column_family_name(), level(0) {}
};
// Metadata returned as output from ExportColumnFamily() and used as input to
// CreateColumnFamiliesWithImport().
struct ExportImportFilesMetaData {
std::string db_comparator_name; // Used to safety check at import.
std::vector<LiveFileMetaData> files; // Vector of file metadata.
};
} // namespace ROCKSDB_NAMESPACE
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