0c2bd5cb4b
Summary: Doing inline checking of transaction expiration instead of using a callback. Test Plan: To be added Reviewers: anthony Reviewed By: anthony Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D53673
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
// Copyright (c) 2015, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
|
|
#pragma once
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
|
|
#include <atomic>
|
|
#include <stack>
|
|
#include <string>
|
|
#include <unordered_map>
|
|
#include <vector>
|
|
|
|
#include "db/write_callback.h"
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/snapshot.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/types.h"
|
|
#include "rocksdb/utilities/transaction.h"
|
|
#include "rocksdb/utilities/transaction_db.h"
|
|
#include "rocksdb/utilities/write_batch_with_index.h"
|
|
#include "utilities/transactions/transaction_base.h"
|
|
#include "utilities/transactions/transaction_util.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
using TransactionID = uint64_t;
|
|
|
|
class TransactionDBImpl;
|
|
|
|
class TransactionImpl : public TransactionBaseImpl {
|
|
public:
|
|
TransactionImpl(TransactionDB* db, const WriteOptions& write_options,
|
|
const TransactionOptions& txn_options);
|
|
|
|
virtual ~TransactionImpl();
|
|
|
|
Status Commit() override;
|
|
|
|
Status CommitBatch(WriteBatch* batch);
|
|
|
|
void Rollback() override;
|
|
|
|
Status RollbackToSavePoint() override;
|
|
|
|
// Generate a new unique transaction identifier
|
|
static TransactionID GenTxnID();
|
|
|
|
TransactionID GetTxnID() const { return txn_id_; }
|
|
|
|
// Returns the time (in microseconds according to Env->GetMicros())
|
|
// that this transaction will be expired. Returns 0 if this transaction does
|
|
// not expire.
|
|
uint64_t GetExpirationTime() const { return expiration_time_; }
|
|
|
|
// returns true if this transaction has an expiration_time and has expired.
|
|
bool IsExpired() const;
|
|
|
|
// Returns the number of microseconds a transaction can wait on acquiring a
|
|
// lock or -1 if there is no timeout.
|
|
int64_t GetLockTimeout() const { return lock_timeout_; }
|
|
void SetLockTimeout(int64_t timeout) override {
|
|
lock_timeout_ = timeout * 1000;
|
|
}
|
|
|
|
// Returns true if locks were stolen successfully, false otherwise.
|
|
bool TryStealingLocks();
|
|
|
|
protected:
|
|
Status TryLock(ColumnFamilyHandle* column_family, const Slice& key,
|
|
bool untracked = false) override;
|
|
|
|
private:
|
|
enum ExecutionStatus { STARTED, COMMITTING, LOCKS_STOLEN };
|
|
|
|
TransactionDBImpl* txn_db_impl_;
|
|
|
|
// Used to create unique ids for transactions.
|
|
static std::atomic<TransactionID> txn_id_counter_;
|
|
|
|
// Unique ID for this transaction
|
|
const TransactionID txn_id_;
|
|
|
|
// If non-zero, this transaction should not be committed after this time (in
|
|
// microseconds according to Env->NowMicros())
|
|
const uint64_t expiration_time_;
|
|
|
|
// Timeout in microseconds when locking a key or -1 if there is no timeout.
|
|
int64_t lock_timeout_;
|
|
|
|
// Execution status of the transaction.
|
|
std::atomic<ExecutionStatus> exec_status_;
|
|
|
|
void Clear() override;
|
|
|
|
Status ValidateSnapshot(ColumnFamilyHandle* column_family, const Slice& key,
|
|
SequenceNumber prev_seqno, SequenceNumber* new_seqno);
|
|
|
|
Status LockBatch(WriteBatch* batch, TransactionKeyMap* keys_to_unlock);
|
|
|
|
Status DoCommit(WriteBatch* batch);
|
|
|
|
void RollbackLastN(size_t num);
|
|
|
|
// No copying allowed
|
|
TransactionImpl(const TransactionImpl&);
|
|
void operator=(const TransactionImpl&);
|
|
};
|
|
|
|
} // namespace rocksdb
|
|
|
|
#endif // ROCKSDB_LITE
|