mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-30 13:41:46 +00:00
2515266725
Summary: This patch clarifies and refactors the logic around tracked keys in transactions. Closes https://github.com/facebook/rocksdb/pull/3140 Differential Revision: D6290258 Pulled By: maysamyabandeh fbshipit-source-id: 03b50646264cbcc550813c060b180fc7451a55c1
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
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
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
|
|
#include <algorithm>
|
|
#include <atomic>
|
|
#include <mutex>
|
|
#include <stack>
|
|
#include <string>
|
|
#include <unordered_map>
|
|
#include <vector>
|
|
|
|
#include "db/write_callback.h"
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/snapshot.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/types.h"
|
|
#include "rocksdb/utilities/transaction.h"
|
|
#include "rocksdb/utilities/transaction_db.h"
|
|
#include "rocksdb/utilities/write_batch_with_index.h"
|
|
#include "util/autovector.h"
|
|
#include "utilities/transactions/pessimistic_transaction.h"
|
|
#include "utilities/transactions/pessimistic_transaction_db.h"
|
|
#include "utilities/transactions/transaction_base.h"
|
|
#include "utilities/transactions/transaction_util.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
class WritePreparedTxnDB;
|
|
|
|
// This impl could write to DB also uncomitted data and then later tell apart
|
|
// committed data from uncomitted data. Uncommitted data could be after the
|
|
// Prepare phase in 2PC (WritePreparedTxn) or before that
|
|
// (WriteUnpreparedTxnImpl).
|
|
class WritePreparedTxn : public PessimisticTransaction {
|
|
public:
|
|
WritePreparedTxn(WritePreparedTxnDB* db, const WriteOptions& write_options,
|
|
const TransactionOptions& txn_options);
|
|
|
|
virtual ~WritePreparedTxn() {}
|
|
|
|
// To make WAL commit markers visible, the snapshot will be based on the last
|
|
// seq in the WAL, LastAllocatedSequence, as opposed to the last seq in the
|
|
// memtable.
|
|
using Transaction::Get;
|
|
virtual Status Get(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family, const Slice& key,
|
|
PinnableSlice* value) override;
|
|
|
|
// To make WAL commit markers visible, the snapshot will be based on the last
|
|
// seq in the WAL, LastAllocatedSequence, as opposed to the last seq in the
|
|
// memtable.
|
|
using Transaction::GetIterator;
|
|
virtual Iterator* GetIterator(const ReadOptions& options) override;
|
|
virtual Iterator* GetIterator(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family) override;
|
|
|
|
private:
|
|
friend class WritePreparedTransactionTest_BasicRecoveryTest_Test;
|
|
|
|
SequenceNumber GetACommitSeqNumber(SequenceNumber prep_seq);
|
|
|
|
Status PrepareInternal() override;
|
|
|
|
Status CommitWithoutPrepareInternal() override;
|
|
|
|
Status CommitBatchInternal(WriteBatch* batch) override;
|
|
|
|
// Since the data is already written to memtables at the Prepare phase, the
|
|
// commit entails writing only a commit marker in the WAL. The sequence number
|
|
// of the commit marker is then the commit timestamp of the transaction. To
|
|
// make the commit timestamp visible to readers, their snapshot is based on
|
|
// the last seq in the WAL, LastAllocatedSequence, as opposed to the last seq
|
|
// in the memtable.
|
|
Status CommitInternal() override;
|
|
|
|
Status RollbackInternal() override;
|
|
|
|
virtual Status ValidateSnapshot(ColumnFamilyHandle* column_family,
|
|
const Slice& key,
|
|
SequenceNumber* tracked_at_seq) override;
|
|
|
|
// No copying allowed
|
|
WritePreparedTxn(const WritePreparedTxn&);
|
|
void operator=(const WritePreparedTxn&);
|
|
|
|
WritePreparedTxnDB* wpt_db_;
|
|
};
|
|
|
|
} // namespace rocksdb
|
|
|
|
#endif // ROCKSDB_LITE
|