Summary:
This reverts the previous commit 1d7048c598
, which broke the build.
Did a `git revert 1d7048c`.
Closes https://github.com/facebook/rocksdb/pull/2627
Differential Revision: D5476473
Pulled By: sagar0
fbshipit-source-id: 4756ff5c0dfc88c17eceb00e02c36176de728d06
200 lines
6.0 KiB
C++
200 lines
6.0 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/transaction_base.h"
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#include "utilities/transactions/transaction_util.h"
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namespace rocksdb {
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class TransactionDBImpl;
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class TransactionImpl : public TransactionBaseImpl {
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public:
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TransactionImpl(TransactionDB* db, const WriteOptions& write_options,
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const TransactionOptions& txn_options);
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virtual ~TransactionImpl();
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void Reinitialize(TransactionDB* txn_db, const WriteOptions& write_options,
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const TransactionOptions& txn_options);
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Status Prepare() override;
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Status Commit() override;
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Status CommitBatch(WriteBatch* batch);
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Status Rollback() override;
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Status RollbackToSavePoint() override;
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Status SetName(const TransactionName& name) override;
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// Generate a new unique transaction identifier
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static TransactionID GenTxnID();
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TransactionID GetID() const override { return txn_id_; }
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std::vector<TransactionID> GetWaitingTxns(uint32_t* column_family_id,
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std::string* key) const override {
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std::lock_guard<std::mutex> lock(wait_mutex_);
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std::vector<TransactionID> ids(waiting_txn_ids_.size());
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if (key) *key = waiting_key_ ? *waiting_key_ : "";
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if (column_family_id) *column_family_id = waiting_cf_id_;
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std::copy(waiting_txn_ids_.begin(), waiting_txn_ids_.end(), ids.begin());
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return ids;
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}
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void SetWaitingTxn(autovector<TransactionID> ids, uint32_t column_family_id,
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const std::string* key) {
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std::lock_guard<std::mutex> lock(wait_mutex_);
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waiting_txn_ids_ = ids;
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waiting_cf_id_ = column_family_id;
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waiting_key_ = key;
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}
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void ClearWaitingTxn() {
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std::lock_guard<std::mutex> lock(wait_mutex_);
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waiting_txn_ids_.clear();
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waiting_cf_id_ = 0;
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waiting_key_ = nullptr;
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}
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// Returns the time (in microseconds according to Env->GetMicros())
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// that this transaction will be expired. Returns 0 if this transaction does
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// not expire.
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uint64_t GetExpirationTime() const { return expiration_time_; }
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// returns true if this transaction has an expiration_time and has expired.
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bool IsExpired() const;
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// Returns the number of microseconds a transaction can wait on acquiring a
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// lock or -1 if there is no timeout.
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int64_t GetLockTimeout() const { return lock_timeout_; }
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void SetLockTimeout(int64_t timeout) override {
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lock_timeout_ = timeout * 1000;
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}
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// Returns true if locks were stolen successfully, false otherwise.
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bool TryStealingLocks();
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bool IsDeadlockDetect() const override { return deadlock_detect_; }
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int64_t GetDeadlockDetectDepth() const { return deadlock_detect_depth_; }
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protected:
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Status TryLock(ColumnFamilyHandle* column_family, const Slice& key,
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bool read_only, bool exclusive,
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bool untracked = false) override;
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private:
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TransactionDBImpl* txn_db_impl_;
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DBImpl* db_impl_;
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// Used to create unique ids for transactions.
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static std::atomic<TransactionID> txn_id_counter_;
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// Unique ID for this transaction
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TransactionID txn_id_;
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// IDs for the transactions that are blocking the current transaction.
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//
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// empty if current transaction is not waiting.
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autovector<TransactionID> waiting_txn_ids_;
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// The following two represents the (cf, key) that a transaction is waiting
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// on.
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//
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// If waiting_key_ is not null, then the pointer should always point to
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// a valid string object. The reason is that it is only non-null when the
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// transaction is blocked in the TransactionLockMgr::AcquireWithTimeout
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// function. At that point, the key string object is one of the function
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// parameters.
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uint32_t waiting_cf_id_;
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const std::string* waiting_key_;
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// Mutex protecting waiting_txn_ids_, waiting_cf_id_ and waiting_key_.
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mutable std::mutex wait_mutex_;
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// If non-zero, this transaction should not be committed after this time (in
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// microseconds according to Env->NowMicros())
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uint64_t expiration_time_;
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// Timeout in microseconds when locking a key or -1 if there is no timeout.
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int64_t lock_timeout_;
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// Whether to perform deadlock detection or not.
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bool deadlock_detect_;
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// Whether to perform deadlock detection or not.
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int64_t deadlock_detect_depth_;
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void Clear() override;
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void Initialize(const TransactionOptions& txn_options);
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Status ValidateSnapshot(ColumnFamilyHandle* column_family, const Slice& key,
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SequenceNumber prev_seqno, SequenceNumber* new_seqno);
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Status LockBatch(WriteBatch* batch, TransactionKeyMap* keys_to_unlock);
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Status DoCommit(WriteBatch* batch);
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void RollbackLastN(size_t num);
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void UnlockGetForUpdate(ColumnFamilyHandle* column_family,
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const Slice& key) override;
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// No copying allowed
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TransactionImpl(const TransactionImpl&);
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void operator=(const TransactionImpl&);
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};
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// Used at commit time to check whether transaction is committing before its
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// expiration time.
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class TransactionCallback : public WriteCallback {
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public:
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explicit TransactionCallback(TransactionImpl* txn) : txn_(txn) {}
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Status Callback(DB* db) override {
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if (txn_->IsExpired()) {
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return Status::Expired();
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} else {
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return Status::OK();
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}
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}
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bool AllowWriteBatching() override { return true; }
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private:
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TransactionImpl* txn_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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