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rocksdb/include/rocksdb/sst_file_writer.h

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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).
#ifndef ROCKSDB_LITE
#pragma once
#include <memory>
#include <string>
#include "rocksdb/env.h"
#include "rocksdb/options.h"
#include "rocksdb/table_properties.h"
#include "rocksdb/types.h"
#if defined(__GNUC__) || defined(__clang__)
#define ROCKSDB_DEPRECATED_FUNC __attribute__((__deprecated__))
#elif _WIN32
#define ROCKSDB_DEPRECATED_FUNC __declspec(deprecated)
#endif
namespace rocksdb {
class Comparator;
// ExternalSstFileInfo include information about sst files created
// using SstFileWriter.
struct ExternalSstFileInfo {
ExternalSstFileInfo()
: file_path(""),
smallest_key(""),
largest_key(""),
sequence_number(0),
file_size(0),
num_entries(0),
version(0) {}
ExternalSstFileInfo(const std::string& _file_path,
const std::string& _smallest_key,
const std::string& _largest_key,
SequenceNumber _sequence_number, uint64_t _file_size,
int32_t _num_entries, int32_t _version)
: file_path(_file_path),
smallest_key(_smallest_key),
largest_key(_largest_key),
sequence_number(_sequence_number),
file_size(_file_size),
num_entries(_num_entries),
version(_version) {}
std::string file_path; // external sst file path
std::string smallest_key; // smallest user key in file
std::string largest_key; // largest user key in file
SequenceNumber sequence_number; // sequence number of all keys in file
uint64_t file_size; // file size in bytes
uint64_t num_entries; // number of entries in file
int32_t version; // file version
};
// SstFileWriter is used to create sst files that can be added to database later
// All keys in files generated by SstFileWriter will have sequence number = 0.
class SstFileWriter {
public:
// User can pass `column_family` to specify that the generated file will
// be ingested into this column_family, note that passing nullptr means that
// the column_family is unknown.
// If invalidate_page_cache is set to true, SstFileWriter will give the OS a
// hint that this file pages is not needed every time we write 1MB to the file.
// To use the rate limiter an io_priority smaller than IO_TOTAL can be passed.
SstFileWriter(const EnvOptions& env_options, const Options& options,
ColumnFamilyHandle* column_family = nullptr,
bool invalidate_page_cache = true,
Env::IOPriority io_priority = Env::IOPriority::IO_TOTAL,
bool skip_filters = false)
: SstFileWriter(env_options, options, options.comparator, column_family,
invalidate_page_cache, io_priority, skip_filters) {}
// Deprecated API
SstFileWriter(const EnvOptions& env_options, const Options& options,
const Comparator* user_comparator,
ColumnFamilyHandle* column_family = nullptr,
bool invalidate_page_cache = true,
Env::IOPriority io_priority = Env::IOPriority::IO_TOTAL,
bool skip_filters = false);
~SstFileWriter();
// Prepare SstFileWriter to write into file located at "file_path".
Status Open(const std::string& file_path);
// Add a Put key with value to currently opened file (deprecated)
// REQUIRES: key is after any previously added key according to comparator.
ROCKSDB_DEPRECATED_FUNC Status Add(const Slice& user_key, const Slice& value);
// Add a Put key with value to currently opened file
// REQUIRES: key is after any previously added key according to comparator.
Status Put(const Slice& user_key, const Slice& value);
// Add a Merge key with value to currently opened file
// REQUIRES: key is after any previously added key according to comparator.
Status Merge(const Slice& user_key, const Slice& value);
// Add a deletion key to currently opened file
// REQUIRES: key is after any previously added key according to comparator.
Status Delete(const Slice& user_key);
// Finalize writing to sst file and close file.
//
// An optional ExternalSstFileInfo pointer can be passed to the function
// which will be populated with information about the created sst file.
Status Finish(ExternalSstFileInfo* file_info = nullptr);
// Return the current file size.
uint64_t FileSize();
private:
void InvalidatePageCache(bool closing);
struct Rep;
std::unique_ptr<Rep> rep_;
};
} // namespace rocksdb
#endif // !ROCKSDB_LITE