90f744941d
Summary: Transaction has had methods to deal with SavePoints already, but was missing the PopSavePoint method provided by WriteBatch and WriteBatchWithIndex. This PR adds PopSavePoint to Transaction as well. Having the method on Transaction-level too is useful for applications that repeatedly execute a sequence of operations that normally succeed, but infrequently need to get rolled back. Using SavePoints here is sensible, but as operations normally succeed the application may pile up a lot of useless SavePoints inside a Transaction, leading to slightly increased memory usage for managing the unneeded SavePoints. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4256 Differential Revision: D9326932 Pulled By: yiwu-arbug fbshipit-source-id: 53a0af18a6c7e87feff8a56f1f3eab9df7f371d6
347 lines
12 KiB
C++
347 lines
12 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 <stack>
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#include <string>
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#include <vector>
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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 "utilities/transactions/transaction_util.h"
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namespace rocksdb {
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class TransactionBaseImpl : public Transaction {
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public:
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TransactionBaseImpl(DB* db, const WriteOptions& write_options);
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virtual ~TransactionBaseImpl();
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// Remove pending operations queued in this transaction.
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virtual void Clear();
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void Reinitialize(DB* db, const WriteOptions& write_options);
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// Called before executing Put, Merge, Delete, and GetForUpdate. If TryLock
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// returns non-OK, the Put/Merge/Delete/GetForUpdate will be failed.
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// skip_validate will be true if called from PutUntracked, DeleteUntracked, or
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// MergeUntracked.
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virtual Status TryLock(ColumnFamilyHandle* column_family, const Slice& key,
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bool read_only, bool exclusive,
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bool skip_validate = false) = 0;
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void SetSavePoint() override;
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Status RollbackToSavePoint() override;
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Status PopSavePoint() override;
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using Transaction::Get;
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Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
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const Slice& key, std::string* value) override;
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Status Get(const ReadOptions& options, ColumnFamilyHandle* column_family,
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const Slice& key, PinnableSlice* value) override;
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Status Get(const ReadOptions& options, const Slice& key,
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std::string* value) override {
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return Get(options, db_->DefaultColumnFamily(), key, value);
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}
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using Transaction::GetForUpdate;
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Status GetForUpdate(const ReadOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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std::string* value, bool exclusive) override;
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Status GetForUpdate(const ReadOptions& options,
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ColumnFamilyHandle* column_family, const Slice& key,
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PinnableSlice* pinnable_val, bool exclusive) override;
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Status GetForUpdate(const ReadOptions& options, const Slice& key,
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std::string* value, bool exclusive) override {
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return GetForUpdate(options, db_->DefaultColumnFamily(), key, value,
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exclusive);
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}
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std::vector<Status> MultiGet(
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const ReadOptions& options,
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const std::vector<ColumnFamilyHandle*>& column_family,
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const std::vector<Slice>& keys,
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std::vector<std::string>* values) override;
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std::vector<Status> MultiGet(const ReadOptions& options,
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const std::vector<Slice>& keys,
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std::vector<std::string>* values) override {
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return MultiGet(options, std::vector<ColumnFamilyHandle*>(
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keys.size(), db_->DefaultColumnFamily()),
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keys, values);
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}
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std::vector<Status> MultiGetForUpdate(
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const ReadOptions& options,
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const std::vector<ColumnFamilyHandle*>& column_family,
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const std::vector<Slice>& keys,
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std::vector<std::string>* values) override;
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std::vector<Status> MultiGetForUpdate(
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const ReadOptions& options, const std::vector<Slice>& keys,
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std::vector<std::string>* values) override {
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return MultiGetForUpdate(options,
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std::vector<ColumnFamilyHandle*>(
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keys.size(), db_->DefaultColumnFamily()),
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keys, values);
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}
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Iterator* GetIterator(const ReadOptions& read_options) override;
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Iterator* GetIterator(const ReadOptions& read_options,
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ColumnFamilyHandle* column_family) override;
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Status Put(ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) override;
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Status Put(const Slice& key, const Slice& value) override {
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return Put(nullptr, key, value);
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}
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Status Put(ColumnFamilyHandle* column_family, const SliceParts& key,
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const SliceParts& value) override;
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Status Put(const SliceParts& key, const SliceParts& value) override {
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return Put(nullptr, key, value);
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}
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Status Merge(ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) override;
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Status Merge(const Slice& key, const Slice& value) override {
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return Merge(nullptr, key, value);
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}
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Status Delete(ColumnFamilyHandle* column_family, const Slice& key) override;
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Status Delete(const Slice& key) override { return Delete(nullptr, key); }
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Status Delete(ColumnFamilyHandle* column_family,
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const SliceParts& key) override;
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Status Delete(const SliceParts& key) override { return Delete(nullptr, key); }
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Status SingleDelete(ColumnFamilyHandle* column_family,
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const Slice& key) override;
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Status SingleDelete(const Slice& key) override {
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return SingleDelete(nullptr, key);
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}
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Status SingleDelete(ColumnFamilyHandle* column_family,
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const SliceParts& key) override;
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Status SingleDelete(const SliceParts& key) override {
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return SingleDelete(nullptr, key);
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}
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Status PutUntracked(ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) override;
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Status PutUntracked(const Slice& key, const Slice& value) override {
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return PutUntracked(nullptr, key, value);
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}
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Status PutUntracked(ColumnFamilyHandle* column_family, const SliceParts& key,
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const SliceParts& value) override;
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Status PutUntracked(const SliceParts& key, const SliceParts& value) override {
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return PutUntracked(nullptr, key, value);
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}
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Status MergeUntracked(ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) override;
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Status MergeUntracked(const Slice& key, const Slice& value) override {
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return MergeUntracked(nullptr, key, value);
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}
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Status DeleteUntracked(ColumnFamilyHandle* column_family,
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const Slice& key) override;
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Status DeleteUntracked(const Slice& key) override {
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return DeleteUntracked(nullptr, key);
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}
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Status DeleteUntracked(ColumnFamilyHandle* column_family,
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const SliceParts& key) override;
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Status DeleteUntracked(const SliceParts& key) override {
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return DeleteUntracked(nullptr, key);
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}
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Status SingleDeleteUntracked(ColumnFamilyHandle* column_family,
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const Slice& key) override;
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Status SingleDeleteUntracked(const Slice& key) override {
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return SingleDeleteUntracked(nullptr, key);
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}
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void PutLogData(const Slice& blob) override;
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WriteBatchWithIndex* GetWriteBatch() override;
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virtual void SetLockTimeout(int64_t /*timeout*/) override { /* Do nothing */
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}
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const Snapshot* GetSnapshot() const override {
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return snapshot_ ? snapshot_.get() : nullptr;
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}
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virtual void SetSnapshot() override;
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void SetSnapshotOnNextOperation(
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std::shared_ptr<TransactionNotifier> notifier = nullptr) override;
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void ClearSnapshot() override {
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snapshot_.reset();
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snapshot_needed_ = false;
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snapshot_notifier_ = nullptr;
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}
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void DisableIndexing() override { indexing_enabled_ = false; }
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void EnableIndexing() override { indexing_enabled_ = true; }
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uint64_t GetElapsedTime() const override;
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uint64_t GetNumPuts() const override;
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uint64_t GetNumDeletes() const override;
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uint64_t GetNumMerges() const override;
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uint64_t GetNumKeys() const override;
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void UndoGetForUpdate(ColumnFamilyHandle* column_family,
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const Slice& key) override;
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void UndoGetForUpdate(const Slice& key) override {
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return UndoGetForUpdate(nullptr, key);
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};
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// Get list of keys in this transaction that must not have any conflicts
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// with writes in other transactions.
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const TransactionKeyMap& GetTrackedKeys() const { return tracked_keys_; }
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WriteOptions* GetWriteOptions() override { return &write_options_; }
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void SetWriteOptions(const WriteOptions& write_options) override {
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write_options_ = write_options;
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}
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// Used for memory management for snapshot_
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void ReleaseSnapshot(const Snapshot* snapshot, DB* db);
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// iterates over the given batch and makes the appropriate inserts.
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// used for rebuilding prepared transactions after recovery.
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virtual Status RebuildFromWriteBatch(WriteBatch* src_batch) override;
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WriteBatch* GetCommitTimeWriteBatch() override;
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protected:
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// Add a key to the list of tracked keys.
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//
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// seqno is the earliest seqno this key was involved with this transaction.
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// readonly should be set to true if no data was written for this key
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void TrackKey(uint32_t cfh_id, const std::string& key, SequenceNumber seqno,
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bool readonly, bool exclusive);
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// Helper function to add a key to the given TransactionKeyMap
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static void TrackKey(TransactionKeyMap* key_map, uint32_t cfh_id,
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const std::string& key, SequenceNumber seqno,
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bool readonly, bool exclusive);
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// Called when UndoGetForUpdate determines that this key can be unlocked.
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virtual void UnlockGetForUpdate(ColumnFamilyHandle* column_family,
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const Slice& key) = 0;
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std::unique_ptr<TransactionKeyMap> GetTrackedKeysSinceSavePoint();
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// Sets a snapshot if SetSnapshotOnNextOperation() has been called.
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void SetSnapshotIfNeeded();
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DB* db_;
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DBImpl* dbimpl_;
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WriteOptions write_options_;
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const Comparator* cmp_;
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// Stores that time the txn was constructed, in microseconds.
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uint64_t start_time_;
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// Stores the current snapshot that was set by SetSnapshot or null if
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// no snapshot is currently set.
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std::shared_ptr<const Snapshot> snapshot_;
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// Count of various operations pending in this transaction
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uint64_t num_puts_ = 0;
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uint64_t num_deletes_ = 0;
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uint64_t num_merges_ = 0;
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struct SavePoint {
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std::shared_ptr<const Snapshot> snapshot_;
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bool snapshot_needed_;
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std::shared_ptr<TransactionNotifier> snapshot_notifier_;
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uint64_t num_puts_;
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uint64_t num_deletes_;
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uint64_t num_merges_;
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// Record all keys tracked since the last savepoint
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TransactionKeyMap new_keys_;
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SavePoint(std::shared_ptr<const Snapshot> snapshot, bool snapshot_needed,
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std::shared_ptr<TransactionNotifier> snapshot_notifier,
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uint64_t num_puts, uint64_t num_deletes, uint64_t num_merges)
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: snapshot_(snapshot),
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snapshot_needed_(snapshot_needed),
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snapshot_notifier_(snapshot_notifier),
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num_puts_(num_puts),
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num_deletes_(num_deletes),
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num_merges_(num_merges) {}
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};
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// Records writes pending in this transaction
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WriteBatchWithIndex write_batch_;
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private:
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friend class WritePreparedTxn;
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// Extra data to be persisted with the commit. Note this is only used when
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// prepare phase is not skipped.
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WriteBatch commit_time_batch_;
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// Stack of the Snapshot saved at each save point. Saved snapshots may be
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// nullptr if there was no snapshot at the time SetSavePoint() was called.
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std::unique_ptr<std::stack<TransactionBaseImpl::SavePoint>> save_points_;
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// Map from column_family_id to map of keys that are involved in this
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// transaction.
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// For Pessimistic Transactions this is the list of locked keys.
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// Optimistic Transactions will wait till commit time to do conflict checking.
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TransactionKeyMap tracked_keys_;
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// If true, future Put/Merge/Deletes will be indexed in the
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// WriteBatchWithIndex.
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// If false, future Put/Merge/Deletes will be inserted directly into the
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// underlying WriteBatch and not indexed in the WriteBatchWithIndex.
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bool indexing_enabled_;
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// SetSnapshotOnNextOperation() has been called and the snapshot has not yet
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// been reset.
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bool snapshot_needed_ = false;
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// SetSnapshotOnNextOperation() has been called and the caller would like
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// a notification through the TransactionNotifier interface
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std::shared_ptr<TransactionNotifier> snapshot_notifier_ = nullptr;
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Status TryLock(ColumnFamilyHandle* column_family, const SliceParts& key,
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bool read_only, bool exclusive, bool skip_validate = false);
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WriteBatchBase* GetBatchForWrite();
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void SetSnapshotInternal(const Snapshot* snapshot);
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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