mirror of https://github.com/facebook/rocksdb.git
107 lines
4.1 KiB
C++
107 lines
4.1 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 "utilities/transactions/write_prepared_txn_db.h"
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#include "utilities/transactions/write_unprepared_txn.h"
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namespace ROCKSDB_NAMESPACE {
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class WriteUnpreparedTxn;
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class WriteUnpreparedTxnDB : public WritePreparedTxnDB {
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public:
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using WritePreparedTxnDB::WritePreparedTxnDB;
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Status Initialize(const std::vector<size_t>& compaction_enabled_cf_indices,
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const std::vector<ColumnFamilyHandle*>& handles) override;
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Transaction* BeginTransaction(const WriteOptions& write_options,
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const TransactionOptions& txn_options,
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Transaction* old_txn) override;
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// Struct to hold ownership of snapshot and read callback for cleanup.
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struct IteratorState;
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using WritePreparedTxnDB::NewIterator;
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Iterator* NewIterator(const ReadOptions& _read_options,
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ColumnFamilyHandle* column_family,
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WriteUnpreparedTxn* txn);
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private:
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Status RollbackRecoveredTransaction(const DBImpl::RecoveredTransaction* rtxn);
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};
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class WriteUnpreparedCommitEntryPreReleaseCallback : public PreReleaseCallback {
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// TODO(lth): Reduce code duplication with
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// WritePreparedCommitEntryPreReleaseCallback
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public:
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// includes_data indicates that the commit also writes non-empty
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// CommitTimeWriteBatch to memtable, which needs to be committed separately.
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WriteUnpreparedCommitEntryPreReleaseCallback(
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WritePreparedTxnDB* db, DBImpl* db_impl,
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const std::map<SequenceNumber, size_t>& unprep_seqs,
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size_t data_batch_cnt = 0, bool publish_seq = true)
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: db_(db),
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db_impl_(db_impl),
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unprep_seqs_(unprep_seqs),
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data_batch_cnt_(data_batch_cnt),
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includes_data_(data_batch_cnt_ > 0),
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publish_seq_(publish_seq) {
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assert(unprep_seqs.size() > 0);
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}
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virtual Status Callback(SequenceNumber commit_seq,
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bool is_mem_disabled __attribute__((__unused__)),
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uint64_t, size_t /*index*/,
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size_t /*total*/) override {
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const uint64_t last_commit_seq = LIKELY(data_batch_cnt_ <= 1)
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? commit_seq
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: commit_seq + data_batch_cnt_ - 1;
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// Recall that unprep_seqs maps (un)prepared_seq => prepare_batch_cnt.
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for (const auto& s : unprep_seqs_) {
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for (size_t i = 0; i < s.second; i++) {
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db_->AddCommitted(s.first + i, last_commit_seq);
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}
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}
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if (includes_data_) {
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assert(data_batch_cnt_);
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// Commit the data that is accompanied with the commit request
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for (size_t i = 0; i < data_batch_cnt_; i++) {
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// For commit seq of each batch use the commit seq of the last batch.
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// This would make debugging easier by having all the batches having
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// the same sequence number.
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db_->AddCommitted(commit_seq + i, last_commit_seq);
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}
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}
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if (db_impl_->immutable_db_options().two_write_queues && publish_seq_) {
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assert(is_mem_disabled); // implies the 2nd queue
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// Publish the sequence number. We can do that here assuming the callback
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// is invoked only from one write queue, which would guarantee that the
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// publish sequence numbers will be in order, i.e., once a seq is
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// published all the seq prior to that are also publishable.
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db_impl_->SetLastPublishedSequence(last_commit_seq);
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}
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// else SequenceNumber that is updated as part of the write already does the
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// publishing
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return Status::OK();
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}
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private:
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WritePreparedTxnDB* db_;
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DBImpl* db_impl_;
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const std::map<SequenceNumber, size_t>& unprep_seqs_;
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size_t data_batch_cnt_;
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// Either because it is commit without prepare or it has a
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// CommitTimeWriteBatch
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bool includes_data_;
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// Should the callback also publishes the commit seq number
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bool publish_seq_;
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};
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} // namespace ROCKSDB_NAMESPACE
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