fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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57 lines
2.3 KiB
57 lines
2.3 KiB
// Copyright (c) 2011-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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//
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// A checkpoint is an openable snapshot of a database at a point in time.
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#pragma once
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#ifndef ROCKSDB_LITE
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#include <string>
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#include <vector>
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#include "rocksdb/status.h"
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namespace rocksdb {
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class DB;
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class ColumnFamilyHandle;
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struct LiveFileMetaData;
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struct ExportImportFilesMetaData;
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class 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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static Status Create(DB* db, Checkpoint** checkpoint_ptr);
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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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// log_size_for_flush: if the total log file size is equal or larger than
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// this value, then a flush is triggered for all the column families. The
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// default value is 0, which means flush is always triggered. If you move
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// away from the default, the checkpoint may not contain up-to-date data
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// if WAL writing is not always enabled.
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// Flush will always trigger if it is 2PC.
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virtual Status CreateCheckpoint(const std::string& checkpoint_dir,
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uint64_t log_size_for_flush = 0);
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// Exports all live SST files of a specified Column Family onto export_dir,
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// 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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virtual Status ExportColumnFamily(ColumnFamilyHandle* handle,
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const std::string& export_dir,
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ExportImportFilesMetaData** metadata);
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virtual ~Checkpoint() {}
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};
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} // namespace rocksdb
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#endif // !ROCKSDB_LITE
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