8673a8c567
Summary: Closes https://github.com/facebook/rocksdb/pull/2589 Differential Revision: D5431502 Pulled By: siying fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75
143 lines
4.4 KiB
C++
143 lines
4.4 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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#ifndef ROCKSDB_LITE
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#include "utilities/transactions/optimistic_transaction_impl.h"
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#include <algorithm>
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#include <string>
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#include <vector>
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#include "db/column_family.h"
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#include "db/db_impl.h"
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#include "rocksdb/comparator.h"
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#include "rocksdb/db.h"
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#include "rocksdb/status.h"
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#include "rocksdb/utilities/optimistic_transaction_db.h"
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#include "util/string_util.h"
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#include "utilities/transactions/transaction_util.h"
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namespace rocksdb {
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struct WriteOptions;
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OptimisticTransactionImpl::OptimisticTransactionImpl(
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OptimisticTransactionDB* txn_db, const WriteOptions& write_options,
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const OptimisticTransactionOptions& txn_options)
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: TransactionBaseImpl(txn_db->GetBaseDB(), write_options), txn_db_(txn_db) {
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Initialize(txn_options);
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}
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void OptimisticTransactionImpl::Initialize(
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const OptimisticTransactionOptions& txn_options) {
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if (txn_options.set_snapshot) {
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SetSnapshot();
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}
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}
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void OptimisticTransactionImpl::Reinitialize(
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OptimisticTransactionDB* txn_db, const WriteOptions& write_options,
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const OptimisticTransactionOptions& txn_options) {
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TransactionBaseImpl::Reinitialize(txn_db->GetBaseDB(), write_options);
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Initialize(txn_options);
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}
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OptimisticTransactionImpl::~OptimisticTransactionImpl() {
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}
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void OptimisticTransactionImpl::Clear() {
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TransactionBaseImpl::Clear();
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}
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Status OptimisticTransactionImpl::Prepare() {
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return Status::InvalidArgument(
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"Two phase commit not supported for optimistic transactions.");
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}
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Status OptimisticTransactionImpl::Commit() {
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// Set up callback which will call CheckTransactionForConflicts() to
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// check whether this transaction is safe to be committed.
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OptimisticTransactionCallback callback(this);
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DBImpl* db_impl = dynamic_cast<DBImpl*>(db_->GetRootDB());
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if (db_impl == nullptr) {
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// This should only happen if we support creating transactions from
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// a StackableDB and someone overrides GetRootDB().
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return Status::InvalidArgument(
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"DB::GetRootDB() returned an unexpected DB class");
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}
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Status s = db_impl->WriteWithCallback(
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write_options_, GetWriteBatch()->GetWriteBatch(), &callback);
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if (s.ok()) {
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Clear();
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}
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return s;
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}
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Status OptimisticTransactionImpl::Rollback() {
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Clear();
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return Status::OK();
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}
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// Record this key so that we can check it for conflicts at commit time.
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//
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// 'exclusive' is unused for OptimisticTransaction.
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Status OptimisticTransactionImpl::TryLock(ColumnFamilyHandle* column_family,
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const Slice& key, bool read_only,
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bool exclusive, bool untracked) {
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if (untracked) {
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return Status::OK();
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}
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uint32_t cfh_id = GetColumnFamilyID(column_family);
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SetSnapshotIfNeeded();
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SequenceNumber seq;
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if (snapshot_) {
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seq = snapshot_->GetSequenceNumber();
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} else {
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seq = db_->GetLatestSequenceNumber();
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}
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std::string key_str = key.ToString();
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TrackKey(cfh_id, key_str, seq, read_only, exclusive);
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// Always return OK. Confilct checking will happen at commit time.
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return Status::OK();
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}
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// Returns OK if it is safe to commit this transaction. Returns Status::Busy
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// if there are read or write conflicts that would prevent us from committing OR
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// if we can not determine whether there would be any such conflicts.
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//
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// Should only be called on writer thread in order to avoid any race conditions
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// in detecting write conflicts.
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Status OptimisticTransactionImpl::CheckTransactionForConflicts(DB* db) {
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Status result;
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assert(dynamic_cast<DBImpl*>(db) != nullptr);
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auto db_impl = reinterpret_cast<DBImpl*>(db);
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// Since we are on the write thread and do not want to block other writers,
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// we will do a cache-only conflict check. This can result in TryAgain
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// getting returned if there is not sufficient memtable history to check
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// for conflicts.
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return TransactionUtil::CheckKeysForConflicts(db_impl, GetTrackedKeys(),
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true /* cache_only */);
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}
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Status OptimisticTransactionImpl::SetName(const TransactionName& name) {
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return Status::InvalidArgument("Optimistic transactions cannot be named.");
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}
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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