d1b74b0c82
Summary: Update Compaction/Flush to support WritePreparedTxnDB: Add SnapshotChecker which is a proxy to query WritePreparedTxnDB::IsInSnapshot. Pass SnapshotChecker to DBImpl on WritePreparedTxnDB open. CompactionIterator use it to check if a key has been committed and if it is visible to a snapshot. In CompactionIterator: * check if key has been committed. If not, output uncommitted keys AS-IS. * use SnapshotChecker to check if key is visible to a snapshot when in need. * do not output key with seq = 0 if the key is not committed. Closes https://github.com/facebook/rocksdb/pull/2926 Differential Revision: D5902907 Pulled By: yiwu-arbug fbshipit-source-id: 945e037fdf0aa652dc5ba0ad879461040baa0320
29 lines
770 B
C++
29 lines
770 B
C++
// 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 "rocksdb/types.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
class WritePreparedTxnDB;
|
|
|
|
// Callback class created by WritePreparedTxnDB to check if a key
|
|
// is visible by a snapshot.
|
|
class SnapshotChecker {
|
|
public:
|
|
explicit SnapshotChecker(WritePreparedTxnDB* txn_db);
|
|
|
|
bool IsInSnapshot(SequenceNumber sequence,
|
|
SequenceNumber snapshot_sequence) const;
|
|
|
|
private:
|
|
#ifndef ROCKSDB_LITE
|
|
const WritePreparedTxnDB* const txn_db_;
|
|
#endif // !ROCKSDB_LITE
|
|
};
|
|
|
|
} // namespace rocksdb
|