mirror of https://github.com/facebook/rocksdb.git
80 lines
3.1 KiB
C++
80 lines
3.1 KiB
C++
// Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#ifndef ROCKSDB_LITE
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#include "rocksdb/utilities/checkpoint.h"
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#include <string>
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#include "file/filename.h"
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#include "rocksdb/db.h"
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namespace rocksdb {
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class CheckpointImpl : public Checkpoint {
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public:
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// Creates a Checkpoint object to be used for creating openable snapshots
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explicit CheckpointImpl(DB* db) : db_(db) {}
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// Builds an openable snapshot of RocksDB on the same disk, which
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// accepts an output directory on the same disk, and under the directory
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// (1) hard-linked SST files pointing to existing live SST files
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// SST files will be copied if output directory is on a different filesystem
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// (2) a copied manifest files and other files
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// The directory should not already exist and will be created by this API.
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// The directory will be an absolute path
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using Checkpoint::CreateCheckpoint;
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virtual Status CreateCheckpoint(const std::string& checkpoint_dir,
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uint64_t log_size_for_flush) override;
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// Exports all live SST files of a specified Column Family onto export_dir
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// and returning SST files information in metadata.
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// - SST files will be created as hard links when the directory specified
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// is in the same partition as the db directory, copied otherwise.
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// - export_dir should not already exist and will be created by this API.
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// - Always triggers a flush.
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using Checkpoint::ExportColumnFamily;
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virtual Status ExportColumnFamily(
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ColumnFamilyHandle* handle, const std::string& export_dir,
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ExportImportFilesMetaData** metadata) override;
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// Checkpoint logic can be customized by providing callbacks for link, copy,
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// or create.
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Status CreateCustomCheckpoint(
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const DBOptions& db_options,
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std::function<Status(const std::string& src_dirname,
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const std::string& fname, FileType type)>
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link_file_cb,
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std::function<Status(const std::string& src_dirname,
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const std::string& fname, uint64_t size_limit_bytes,
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FileType type)>
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copy_file_cb,
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std::function<Status(const std::string& fname,
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const std::string& contents, FileType type)>
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create_file_cb,
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uint64_t* sequence_number, uint64_t log_size_for_flush);
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private:
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void CleanStagingDirectory(const std::string& path, Logger* info_log);
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// Export logic customization by providing callbacks for link or copy.
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Status ExportFilesInMetaData(
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const DBOptions& db_options, const ColumnFamilyMetaData& metadata,
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std::function<Status(const std::string& src_dirname,
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const std::string& fname)>
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link_file_cb,
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std::function<Status(const std::string& src_dirname,
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const std::string& fname)>
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copy_file_cb);
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private:
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DB* db_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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