rocksdb/utilities/transactions/transaction_db_impl.h
Manuel Ung be1f1092c9 Expose transaction id, lock state information and transaction wait information
Summary:
This diff does 3 things:

Expose TransactionID so that we can identify transactions when we retrieve locking and lock wait information. This is exposed as `Transaction::GetID`.

Expose lock state information by locking all stripes in all column families and copying their contents to a data structure. This is exposed as `TransactionDB::GetLockStatusData`.

Adds support for tracking the transaction and the key being waited on, and exposes this as `Transaction::GetWaitingTxn`.

Test Plan: unit tests

Reviewers: horuff, sdong

Reviewed By: sdong

Subscribers: vasilep, hermanlee4, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D64413
2016-09-30 11:41:21 -07:00

127 lines
4.7 KiB
C++

// Copyright (c) 2011-present, 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 <mutex>
#include <queue>
#include <string>
#include <unordered_map>
#include <vector>
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/utilities/transaction_db.h"
#include "utilities/transactions/transaction_impl.h"
#include "utilities/transactions/transaction_lock_mgr.h"
namespace rocksdb {
class TransactionDBImpl : public TransactionDB {
public:
explicit TransactionDBImpl(DB* db,
const TransactionDBOptions& txn_db_options);
explicit TransactionDBImpl(StackableDB* db,
const TransactionDBOptions& txn_db_options);
~TransactionDBImpl();
Status Initialize(const std::vector<size_t>& compaction_enabled_cf_indices,
const std::vector<ColumnFamilyHandle*>& handles);
Transaction* BeginTransaction(const WriteOptions& write_options,
const TransactionOptions& txn_options,
Transaction* old_txn) override;
using StackableDB::Put;
virtual Status Put(const WriteOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
const Slice& val) override;
using StackableDB::Delete;
virtual Status Delete(const WriteOptions& wopts,
ColumnFamilyHandle* column_family,
const Slice& key) override;
using StackableDB::Merge;
virtual Status Merge(const WriteOptions& options,
ColumnFamilyHandle* column_family, const Slice& key,
const Slice& value) override;
using StackableDB::Write;
virtual Status Write(const WriteOptions& opts, WriteBatch* updates) override;
using StackableDB::CreateColumnFamily;
virtual Status CreateColumnFamily(const ColumnFamilyOptions& options,
const std::string& column_family_name,
ColumnFamilyHandle** handle) override;
using StackableDB::DropColumnFamily;
virtual Status DropColumnFamily(ColumnFamilyHandle* column_family) override;
Status TryLock(TransactionImpl* txn, uint32_t cfh_id, const std::string& key);
void UnLock(TransactionImpl* txn, const TransactionKeyMap* keys);
void UnLock(TransactionImpl* txn, uint32_t cfh_id, const std::string& key);
void AddColumnFamily(const ColumnFamilyHandle* handle);
static TransactionDBOptions ValidateTxnDBOptions(
const TransactionDBOptions& txn_db_options);
const TransactionDBOptions& GetTxnDBOptions() const {
return txn_db_options_;
}
void InsertExpirableTransaction(TransactionID tx_id, TransactionImpl* tx);
void RemoveExpirableTransaction(TransactionID tx_id);
// If transaction is no longer available, locks can be stolen
// If transaction is available, try stealing locks directly from transaction
// It is the caller's responsibility to ensure that the referred transaction
// is expirable (GetExpirationTime() > 0) and that it is expired.
bool TryStealingExpiredTransactionLocks(TransactionID tx_id);
Transaction* GetTransactionByName(const TransactionName& name) override;
void RegisterTransaction(Transaction* txn);
void UnregisterTransaction(Transaction* txn);
// not thread safe. current use case is during recovery (single thread)
void GetAllPreparedTransactions(std::vector<Transaction*>* trans) override;
TransactionLockMgr::LockStatusData GetLockStatusData() override;
private:
void ReinitializeTransaction(
Transaction* txn, const WriteOptions& write_options,
const TransactionOptions& txn_options = TransactionOptions());
DBImpl* db_impl_;
const TransactionDBOptions txn_db_options_;
TransactionLockMgr lock_mgr_;
// Must be held when adding/dropping column families.
InstrumentedMutex column_family_mutex_;
Transaction* BeginInternalTransaction(const WriteOptions& options);
Status WriteHelper(WriteBatch* updates, TransactionImpl* txn_impl);
// Used to ensure that no locks are stolen from an expirable transaction
// that has started a commit. Only transactions with an expiration time
// should be in this map.
std::mutex map_mutex_;
std::unordered_map<TransactionID, TransactionImpl*>
expirable_transactions_map_;
// map from name to two phase transaction instance
std::mutex name_map_mutex_;
std::unordered_map<TransactionName, Transaction*> transactions_;
};
} // namespace rocksdb
#endif // ROCKSDB_LITE