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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#ifndef ROCKSDB_LITE
#include <mutex>
#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <vector>
#include "db/db_iter.h"
#include "db/read_callback.h"
#include "db/snapshot_checker.h"
#include "rocksdb/db.h"
#include "rocksdb/options.h"
#include "rocksdb/utilities/transaction_db.h"
#include "util/cast_util.h"
#include "utilities/transactions/pessimistic_transaction.h"
#include "utilities/transactions/transaction_lock_mgr.h"
#include "utilities/transactions/write_prepared_txn.h"
namespace ROCKSDB_NAMESPACE {
class PessimisticTransactionDB : public TransactionDB {
public:
explicit PessimisticTransactionDB(DB* db,
const TransactionDBOptions& txn_db_options);
explicit PessimisticTransactionDB(StackableDB* db,
const TransactionDBOptions& txn_db_options);
virtual ~PessimisticTransactionDB();
virtual const Snapshot* GetSnapshot() override { return db_->GetSnapshot(); }
virtual 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 = 0;
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::SingleDelete;
virtual Status SingleDelete(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 TransactionDB::Write;
virtual Status Write(const WriteOptions& opts, WriteBatch* updates) override;
inline Status WriteWithConcurrencyControl(const WriteOptions& opts,
WriteBatch* updates) {
// Need to lock all keys in this batch to prevent write conflicts with
// concurrent transactions.
Transaction* txn = BeginInternalTransaction(opts);
txn->DisableIndexing();
auto txn_impl =
static_cast_with_check<PessimisticTransaction, Transaction>(txn);
// Since commitBatch sorts the keys before locking, concurrent Write()
// operations will not cause a deadlock.
// In order to avoid a deadlock with a concurrent Transaction, Transactions
// should use a lock timeout.
Status s = txn_impl->CommitBatch(updates);
delete txn;
return s;
}
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(PessimisticTransaction* txn, uint32_t cfh_id,
const std::string& key, bool exclusive);
void UnLock(PessimisticTransaction* txn, const TransactionKeyMap* keys);
void UnLock(PessimisticTransaction* 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,
PessimisticTransaction* 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;
std::vector<DeadlockPath> GetDeadlockInfoBuffer() override;
void SetDeadlockInfoBufferSize(uint32_t target_size) override;
// The default implementation does nothing. The actual implementation is moved
// to the child classes that actually need this information. This was due to
// an odd performance drop we observed when the added std::atomic member to
// the base class even when the subclass do not read it in the fast path.
virtual void UpdateCFComparatorMap(const std::vector<ColumnFamilyHandle*>&) {}
virtual void UpdateCFComparatorMap(ColumnFamilyHandle*) {}
protected:
DBImpl* db_impl_;
std::shared_ptr<Logger> info_log_;
const TransactionDBOptions txn_db_options_;
void ReinitializeTransaction(
Transaction* txn, const WriteOptions& write_options,
const TransactionOptions& txn_options = TransactionOptions());
virtual Status VerifyCFOptions(const ColumnFamilyOptions& cf_options);
private:
friend class WritePreparedTxnDB;
friend class WritePreparedTxnDBMock;
friend class WriteUnpreparedTxn;
friend class TransactionTest_DoubleCrashInRecovery_Test;
friend class TransactionTest_DoubleEmptyWrite_Test;
friend class TransactionTest_DuplicateKeys_Test;
friend class TransactionTest_PersistentTwoPhaseTransactionTest_Test;
friend class TransactionTest_TwoPhaseDoubleRecoveryTest_Test;
friend class TransactionTest_TwoPhaseOutOfOrderDelete_Test;
friend class TransactionStressTest_TwoPhaseLongPrepareTest_Test;
friend class WriteUnpreparedTransactionTest_RecoveryTest_Test;
friend class WriteUnpreparedTransactionTest_MarkLogWithPrepSection_Test;
TransactionLockMgr lock_mgr_;
// Must be held when adding/dropping column families.
InstrumentedMutex column_family_mutex_;
Transaction* BeginInternalTransaction(const WriteOptions& options);
// 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, PessimisticTransaction*>
expirable_transactions_map_;
// map from name to two phase transaction instance
std::mutex name_map_mutex_;
std::unordered_map<TransactionName, Transaction*> transactions_;
// Signal that we are testing a crash scenario. Some asserts could be relaxed
// in such cases.
virtual void TEST_Crash() {}
};
// A PessimisticTransactionDB that writes the data to the DB after the commit.
// In this way the DB only contains the committed data.
class WriteCommittedTxnDB : public PessimisticTransactionDB {
public:
explicit WriteCommittedTxnDB(DB* db,
const TransactionDBOptions& txn_db_options)
: PessimisticTransactionDB(db, txn_db_options) {}
explicit WriteCommittedTxnDB(StackableDB* db,
const TransactionDBOptions& txn_db_options)
: PessimisticTransactionDB(db, txn_db_options) {}
virtual ~WriteCommittedTxnDB() {}
Transaction* BeginTransaction(const WriteOptions& write_options,
const TransactionOptions& txn_options,
Transaction* old_txn) override;
// Optimized version of ::Write that makes use of skip_concurrency_control
// hint
using TransactionDB::Write;
virtual Status Write(const WriteOptions& opts,
const TransactionDBWriteOptimizations& optimizations,
WriteBatch* updates) override;
virtual Status Write(const WriteOptions& opts, WriteBatch* updates) override;
};
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE
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