mirror of https://github.com/facebook/rocksdb.git
121 lines
4.6 KiB
C++
121 lines
4.6 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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#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_NAMESPACE {
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class WritePreparedTxnDB;
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// This impl could write to DB also uncommitted data and then later tell apart
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// committed data from uncommitted 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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// No copying allowed
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WritePreparedTxn(const WritePreparedTxn&) = delete;
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void operator=(const WritePreparedTxn&) = delete;
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virtual ~WritePreparedTxn() {}
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// To make WAL commit markers visible, the snapshot will be based on the last
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// seq in the WAL that is also published, LastPublishedSequence, as opposed to
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// the last seq in the memtable.
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using Transaction::Get;
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virtual Status Get(const ReadOptions& _read_options,
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ColumnFamilyHandle* column_family, const Slice& key,
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PinnableSlice* value) override;
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using Transaction::MultiGet;
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virtual void MultiGet(const ReadOptions& _read_options,
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ColumnFamilyHandle* column_family,
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const size_t num_keys, const Slice* keys,
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PinnableSlice* values, Status* statuses,
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const bool sorted_input = false) override;
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// Note: The behavior is undefined in presence of interleaved writes to the
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// same transaction.
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// To make WAL commit markers visible, the snapshot will be
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// based on the last seq in the WAL that is also published,
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// LastPublishedSequence, as opposed to the last seq in the memtable.
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using Transaction::GetIterator;
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virtual Iterator* GetIterator(const ReadOptions& options) override;
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virtual Iterator* GetIterator(const ReadOptions& options,
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ColumnFamilyHandle* column_family) override;
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virtual void SetSnapshot() override;
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protected:
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void Initialize(const TransactionOptions& txn_options) override;
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// Override the protected SetId to make it visible to the friend class
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// WritePreparedTxnDB
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inline void SetId(uint64_t id) override { Transaction::SetId(id); }
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private:
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friend class WritePreparedTransactionTest_BasicRecoveryTest_Test;
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friend class WritePreparedTxnDB;
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friend class WriteUnpreparedTxnDB;
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friend class WriteUnpreparedTxn;
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using Transaction::GetImpl;
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Status GetImpl(const ReadOptions& options, ColumnFamilyHandle* column_family,
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const Slice& key, PinnableSlice* value) override;
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Status PrepareInternal() override;
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Status CommitWithoutPrepareInternal() override;
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Status CommitBatchInternal(WriteBatch* batch, size_t batch_cnt) override;
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// Since the data is already written to memtables at the Prepare phase, the
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// commit entails writing only a commit marker in the WAL. The sequence number
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// of the commit marker is then the commit timestamp of the transaction. To
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// make WAL commit markers visible, the snapshot will be based on the last seq
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// in the WAL that is also published, LastPublishedSequence, as opposed to the
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// last seq in the memtable.
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Status CommitInternal() override;
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Status RollbackInternal() override;
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virtual Status ValidateSnapshot(ColumnFamilyHandle* column_family,
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const Slice& key,
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SequenceNumber* tracked_at_seq) override;
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virtual Status RebuildFromWriteBatch(WriteBatch* src_batch) override;
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WritePreparedTxnDB* wpt_db_;
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// Number of sub-batches in prepare
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size_t prepare_batch_cnt_ = 0;
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};
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} // namespace ROCKSDB_NAMESPACE
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