d27258d3a6
Summary: Implement the rollback of WritePrepared txns. For each modified value, it reads the value before the txn and write it back. This would cancel out the effect of transaction. It also remove the rolled back txn from prepared heap. Closes https://github.com/facebook/rocksdb/pull/2946 Differential Revision: D5937575 Pulled By: maysamyabandeh fbshipit-source-id: a6d3c47f44db3729f44b287a80f97d08dc4e888d
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
// 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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#pragma once
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#ifndef ROCKSDB_LITE
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#include <algorithm>
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#include <atomic>
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#include <mutex>
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#include <stack>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "db/write_callback.h"
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#include "rocksdb/db.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/snapshot.h"
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#include "rocksdb/status.h"
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#include "rocksdb/types.h"
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#include "rocksdb/utilities/transaction.h"
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#include "rocksdb/utilities/transaction_db.h"
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#include "rocksdb/utilities/write_batch_with_index.h"
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#include "util/autovector.h"
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#include "utilities/transactions/pessimistic_transaction.h"
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#include "utilities/transactions/pessimistic_transaction_db.h"
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#include "utilities/transactions/transaction_base.h"
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#include "utilities/transactions/transaction_util.h"
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namespace rocksdb {
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class WritePreparedTxnDB;
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// This impl could write to DB also uncomitted data and then later tell apart
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// committed data from uncomitted data. Uncommitted data could be after the
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// Prepare phase in 2PC (WritePreparedTxn) or before that
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// (WriteUnpreparedTxnImpl).
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class WritePreparedTxn : public PessimisticTransaction {
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public:
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WritePreparedTxn(WritePreparedTxnDB* db, const WriteOptions& write_options,
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const TransactionOptions& txn_options);
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virtual ~WritePreparedTxn() {}
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using Transaction::Get;
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virtual Status Get(const ReadOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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PinnableSlice* value) override;
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private:
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friend class WritePreparedTransactionTest_BasicRecoveryTest_Test;
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Status PrepareInternal() override;
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Status CommitWithoutPrepareInternal() override;
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Status CommitBatchInternal(WriteBatch* batch) override;
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Status CommitInternal() override;
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Status RollbackInternal() override;
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// TODO(myabandeh): verify that the current impl work with values being
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// written with prepare sequence number too.
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// Status ValidateSnapshot(ColumnFamilyHandle* column_family, const Slice&
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// key,
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// SequenceNumber prev_seqno, SequenceNumber*
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// new_seqno);
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// No copying allowed
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WritePreparedTxn(const WritePreparedTxn&);
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void operator=(const WritePreparedTxn&);
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WritePreparedTxnDB* wpt_db_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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