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Refactor TransactionDBImpl 

Summary:
This opens space for the new implementations of TransactionDBImpl such as WritePreparedTxnDBImpl that has a different policy of how to write to DB.
Closes https://github.com/facebook/rocksdb/pull/2689

Differential Revision: D5568918

Pulled By: maysamyabandeh

fbshipit-source-id: f7eac866e175daf3793ae79da108f65cc7dc7b25
This commit is contained in:
Maysam Yabandeh 2017-08-05 17:17:48 -07:00 committed by Facebook Github Bot
parent 20dc5e74f2
commit c9804e007a
11 changed files with 157 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
CMakeLists.txt
View File

@ -520,7 +520,7 @@ set(SOURCES
utilities/transactions/optimistic_transaction_db_impl.cc
utilities/transactions/optimistic_transaction_impl.cc
utilities/transactions/transaction_base.cc
utilities/transactions/transaction_db_impl.cc
utilities/transactions/pessimistic_transaction_db.cc
utilities/transactions/transaction_db_mutex_impl.cc
utilities/transactions/transaction_impl.cc
utilities/transactions/transaction_lock_mgr.cc

3
TARGETS
View File

@ -247,11 +247,12 @@ cpp_library(
"utilities/transactions/optimistic_transaction_db_impl.cc",
"utilities/transactions/optimistic_transaction_impl.cc",
"utilities/transactions/transaction_base.cc",
"utilities/transactions/transaction_db_impl.cc",
"utilities/transactions/pessimistic_transaction_db.cc",
"utilities/transactions/transaction_db_mutex_impl.cc",
"utilities/transactions/transaction_impl.cc",
"utilities/transactions/transaction_lock_mgr.cc",
"utilities/transactions/transaction_util.cc",
"utilities/transactions/write_prepared_transaction_impl.cc",
"utilities/ttl/db_ttl_impl.cc",
"utilities/write_batch_with_index/write_batch_with_index.cc",
"utilities/write_batch_with_index/write_batch_with_index_internal.cc",

12
include/rocksdb/utilities/transaction_db.h
View File

@ -23,6 +23,12 @@ namespace rocksdb {
class TransactionDBMutexFactory;
enum TxnDBWritePolicy {
WRITE_COMMITTED = 0, // write only the committed data
WRITE_PREPARED, // write data after the prepare phase of 2pc
WRITE_UNPREPARED // write data before the prepare phase of 2pc
};
struct TransactionDBOptions {
// Specifies the maximum number of keys that can be locked at the same time
// per column family.
@ -66,6 +72,12 @@ struct TransactionDBOptions {
// condition variable for all transaction locking instead of the default
// mutex/condvar implementation.
std::shared_ptr<TransactionDBMutexFactory> custom_mutex_factory;
// The policy for when to write the data into the DB. The default policy is to
// write only the committed data (WRITE_COMMITTED). The data could be written
// before the commit phase. The DB then needs to provide the mechanisms to
// tell apart committed from uncommitted data.
TxnDBWritePolicy write_policy;
};
struct TransactionOptions {

2
src.mk
View File

@ -195,7 +195,7 @@ LIB_SOURCES = \
utilities/transactions/optimistic_transaction_db_impl.cc \
utilities/transactions/optimistic_transaction_impl.cc \
utilities/transactions/transaction_base.cc \
utilities/transactions/transaction_db_impl.cc \
utilities/transactions/pessimistic_transaction_db.cc \
utilities/transactions/transaction_db_mutex_impl.cc \
utilities/transactions/transaction_impl.cc \
utilities/transactions/transaction_lock_mgr.cc \

128
utilities/transactions/transaction_db_impl.cc → utilities/transactions/pessimistic_transaction_db.cc
View File

@ -5,7 +5,7 @@
#ifndef ROCKSDB_LITE
#include "utilities/transactions/transaction_db_impl.h"
#include "utilities/transactions/pessimistic_transaction_db.h"
#include <string>
#include <unordered_set>
@ -21,8 +21,8 @@
namespace rocksdb {
TransactionDBImpl::TransactionDBImpl(DB* db,
const TransactionDBOptions& txn_db_options)
PessimisticTransactionDB::PessimisticTransactionDB(
DB* db, const TransactionDBOptions& txn_db_options)
: TransactionDB(db),
db_impl_(static_cast_with_check<DBImpl, DB>(db)),
txn_db_options_(txn_db_options),
@ -34,9 +34,9 @@ TransactionDBImpl::TransactionDBImpl(DB* db,
assert(db_impl_ != nullptr);
}
// Support initiliazing TransactionDBImpl from a stackable db
// Support initiliazing PessimisticTransactionDB from a stackable db
//
// TransactionDBImpl
// PessimisticTransactionDB
// ^ ^
// | |
// | +
@ -50,8 +50,8 @@ TransactionDBImpl::TransactionDBImpl(DB* db,
// +
// DB
//
TransactionDBImpl::TransactionDBImpl(StackableDB* db,
const TransactionDBOptions& txn_db_options)
PessimisticTransactionDB::PessimisticTransactionDB(
StackableDB* db, const TransactionDBOptions& txn_db_options)
: TransactionDB(db),
db_impl_(static_cast_with_check<DBImpl, DB>(db->GetRootDB())),
txn_db_options_(txn_db_options),
@ -63,13 +63,13 @@ TransactionDBImpl::TransactionDBImpl(StackableDB* db,
assert(db_impl_ != nullptr);
}
TransactionDBImpl::~TransactionDBImpl() {
PessimisticTransactionDB::~PessimisticTransactionDB() {
while (!transactions_.empty()) {
delete transactions_.begin()->second;
}
}
Status TransactionDBImpl::Initialize(
Status PessimisticTransactionDB::Initialize(
const std::vector<size_t>& compaction_enabled_cf_indices,
const std::vector<ColumnFamilyHandle*>& handles) {
for (auto cf_ptr : handles) {
@ -121,7 +121,7 @@ Status TransactionDBImpl::Initialize(
return s;
}
Transaction* TransactionDBImpl::BeginTransaction(
Transaction* WriteCommittedTxnDB::BeginTransaction(
const WriteOptions& write_options, const TransactionOptions& txn_options,
Transaction* old_txn) {
if (old_txn != nullptr) {
@ -132,7 +132,18 @@ Transaction* TransactionDBImpl::BeginTransaction(
}
}
TransactionDBOptions TransactionDBImpl::ValidateTxnDBOptions(
Transaction* WritePreparedTxnDB::BeginTransaction(
const WriteOptions& write_options, const TransactionOptions& txn_options,
Transaction* old_txn) {
if (old_txn != nullptr) {
ReinitializeTransaction(old_txn, write_options, txn_options);
return old_txn;
} else {
return new WritePreparedTxnImpl(this, write_options, txn_options);
}
}
TransactionDBOptions PessimisticTransactionDB::ValidateTxnDBOptions(
const TransactionDBOptions& txn_db_options) {
TransactionDBOptions validated = txn_db_options;
@ -213,8 +224,19 @@ Status TransactionDB::WrapDB(
DB* db, const TransactionDBOptions& txn_db_options,
const std::vector<size_t>& compaction_enabled_cf_indices,
const std::vector<ColumnFamilyHandle*>& handles, TransactionDB** dbptr) {
TransactionDBImpl* txn_db = new TransactionDBImpl(
db, TransactionDBImpl::ValidateTxnDBOptions(txn_db_options));
PessimisticTransactionDB* txn_db;
switch (txn_db_options.write_policy) {
case WRITE_UNPREPARED:
return Status::NotSupported("WRITE_UNPREPARED is not implemented yet");
case WRITE_PREPARED:
txn_db = new WritePreparedTxnDB(
db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
break;
case WRITE_COMMITTED:
default:
txn_db = new WriteCommittedTxnDB(
db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
}
*dbptr = txn_db;
Status s = txn_db->Initialize(compaction_enabled_cf_indices, handles);
return s;
@ -227,8 +249,19 @@ Status TransactionDB::WrapStackableDB(
StackableDB* db, const TransactionDBOptions& txn_db_options,
const std::vector<size_t>& compaction_enabled_cf_indices,
const std::vector<ColumnFamilyHandle*>& handles, TransactionDB** dbptr) {
TransactionDBImpl* txn_db = new TransactionDBImpl(
db, TransactionDBImpl::ValidateTxnDBOptions(txn_db_options));
PessimisticTransactionDB* txn_db;
switch (txn_db_options.write_policy) {
case WRITE_UNPREPARED:
return Status::NotSupported("WRITE_UNPREPARED is not implemented yet");
case WRITE_PREPARED:
txn_db = new WritePreparedTxnDB(
db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
break;
case WRITE_COMMITTED:
default:
txn_db = new WriteCommittedTxnDB(
db, PessimisticTransactionDB::ValidateTxnDBOptions(txn_db_options));
}
*dbptr = txn_db;
Status s = txn_db->Initialize(compaction_enabled_cf_indices, handles);
return s;
@ -236,11 +269,12 @@ Status TransactionDB::WrapStackableDB(
// Let TransactionLockMgr know that this column family exists so it can
// allocate a LockMap for it.
void TransactionDBImpl::AddColumnFamily(const ColumnFamilyHandle* handle) {
void PessimisticTransactionDB::AddColumnFamily(
const ColumnFamilyHandle* handle) {
lock_mgr_.AddColumnFamily(handle->GetID());
}
Status TransactionDBImpl::CreateColumnFamily(
Status PessimisticTransactionDB::CreateColumnFamily(
const ColumnFamilyOptions& options, const std::string& column_family_name,
ColumnFamilyHandle** handle) {
InstrumentedMutexLock l(&column_family_mutex_);
@ -255,7 +289,8 @@ Status TransactionDBImpl::CreateColumnFamily(
// Let TransactionLockMgr know that it can deallocate the LockMap for this
// column family.
Status TransactionDBImpl::DropColumnFamily(ColumnFamilyHandle* column_family) {
Status PessimisticTransactionDB::DropColumnFamily(
ColumnFamilyHandle* column_family) {
InstrumentedMutexLock l(&column_family_mutex_);
Status s = db_->DropColumnFamily(column_family);
@ -266,23 +301,24 @@ Status TransactionDBImpl::DropColumnFamily(ColumnFamilyHandle* column_family) {
return s;
}
Status TransactionDBImpl::TryLock(PessimisticTxn* txn, uint32_t cfh_id,
const std::string& key, bool exclusive) {
Status PessimisticTransactionDB::TryLock(PessimisticTxn* txn, uint32_t cfh_id,
const std::string& key,
bool exclusive) {
return lock_mgr_.TryLock(txn, cfh_id, key, GetEnv(), exclusive);
}
void TransactionDBImpl::UnLock(PessimisticTxn* txn,
const TransactionKeyMap* keys) {
void PessimisticTransactionDB::UnLock(PessimisticTxn* txn,
const TransactionKeyMap* keys) {
lock_mgr_.UnLock(txn, keys, GetEnv());
}
void TransactionDBImpl::UnLock(PessimisticTxn* txn, uint32_t cfh_id,
const std::string& key) {
void PessimisticTransactionDB::UnLock(PessimisticTxn* txn, uint32_t cfh_id,
const std::string& key) {
lock_mgr_.UnLock(txn, cfh_id, key, GetEnv());
}
// Used when wrapping DB write operations in a transaction
Transaction* TransactionDBImpl::BeginInternalTransaction(
Transaction* PessimisticTransactionDB::BeginInternalTransaction(
const WriteOptions& options) {
TransactionOptions txn_options;
Transaction* txn = BeginTransaction(options, txn_options, nullptr);
@ -301,9 +337,9 @@ Transaction* TransactionDBImpl::BeginInternalTransaction(
// sort its keys before locking them. This guarantees that TransactionDB write
// methods cannot deadlock with eachother (but still could deadlock with a
// Transaction).
Status TransactionDBImpl::Put(const WriteOptions& options,
ColumnFamilyHandle* column_family,
const Slice& key, const Slice& val) {
Status PessimisticTransactionDB::Put(const WriteOptions& options,
ColumnFamilyHandle* column_family,
const Slice& key, const Slice& val) {
Status s;
Transaction* txn = BeginInternalTransaction(options);
@ -322,9 +358,9 @@ Status TransactionDBImpl::Put(const WriteOptions& options,
return s;
}
Status TransactionDBImpl::Delete(const WriteOptions& wopts,
ColumnFamilyHandle* column_family,
const Slice& key) {
Status PessimisticTransactionDB::Delete(const WriteOptions& wopts,
ColumnFamilyHandle* column_family,
const Slice& key) {
Status s;
Transaction* txn = BeginInternalTransaction(wopts);
@ -344,9 +380,9 @@ Status TransactionDBImpl::Delete(const WriteOptions& wopts,
return s;
}
Status TransactionDBImpl::Merge(const WriteOptions& options,
ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
Status PessimisticTransactionDB::Merge(const WriteOptions& options,
ColumnFamilyHandle* column_family,
const Slice& key, const Slice& value) {
Status s;
Transaction* txn = BeginInternalTransaction(options);
@ -366,7 +402,8 @@ Status TransactionDBImpl::Merge(const WriteOptions& options,
return s;
}
Status TransactionDBImpl::Write(const WriteOptions& opts, WriteBatch* updates) {
Status PessimisticTransactionDB::Write(const WriteOptions& opts,
WriteBatch* updates) {
// Need to lock all keys in this batch to prevent write conflicts with
// concurrent transactions.
Transaction* txn = BeginInternalTransaction(opts);
@ -385,19 +422,19 @@ Status TransactionDBImpl::Write(const WriteOptions& opts, WriteBatch* updates) {
return s;
}
void TransactionDBImpl::InsertExpirableTransaction(TransactionID tx_id,
PessimisticTxn* tx) {
void PessimisticTransactionDB::InsertExpirableTransaction(TransactionID tx_id,
PessimisticTxn* tx) {
assert(tx->GetExpirationTime() > 0);
std::lock_guard<std::mutex> lock(map_mutex_);
expirable_transactions_map_.insert({tx_id, tx});
}
void TransactionDBImpl::RemoveExpirableTransaction(TransactionID tx_id) {
void PessimisticTransactionDB::RemoveExpirableTransaction(TransactionID tx_id) {
std::lock_guard<std::mutex> lock(map_mutex_);
expirable_transactions_map_.erase(tx_id);
}
bool TransactionDBImpl::TryStealingExpiredTransactionLocks(
bool PessimisticTransactionDB::TryStealingExpiredTransactionLocks(
TransactionID tx_id) {
std::lock_guard<std::mutex> lock(map_mutex_);
@ -409,7 +446,7 @@ bool TransactionDBImpl::TryStealingExpiredTransactionLocks(
return tx.TryStealingLocks();
}
void TransactionDBImpl::ReinitializeTransaction(
void PessimisticTransactionDB::ReinitializeTransaction(
Transaction* txn, const WriteOptions& write_options,
const TransactionOptions& txn_options) {
auto txn_impl = static_cast_with_check<PessimisticTxn, Transaction>(txn);
@ -417,7 +454,7 @@ void TransactionDBImpl::ReinitializeTransaction(
txn_impl->Reinitialize(this, write_options, txn_options);
}
Transaction* TransactionDBImpl::GetTransactionByName(
Transaction* PessimisticTransactionDB::GetTransactionByName(
const TransactionName& name) {
std::lock_guard<std::mutex> lock(name_map_mutex_);
auto it = transactions_.find(name);
@ -428,7 +465,7 @@ Transaction* TransactionDBImpl::GetTransactionByName(
}
}
void TransactionDBImpl::GetAllPreparedTransactions(
void PessimisticTransactionDB::GetAllPreparedTransactions(
std::vector<Transaction*>* transv) {
assert(transv);
transv->clear();
@ -440,11 +477,12 @@ void TransactionDBImpl::GetAllPreparedTransactions(
}
}
TransactionLockMgr::LockStatusData TransactionDBImpl::GetLockStatusData() {
TransactionLockMgr::LockStatusData
PessimisticTransactionDB::GetLockStatusData() {
return lock_mgr_.GetLockStatusData();
}
void TransactionDBImpl::RegisterTransaction(Transaction* txn) {
void PessimisticTransactionDB::RegisterTransaction(Transaction* txn) {
assert(txn);
assert(txn->GetName().length() > 0);
assert(GetTransactionByName(txn->GetName()) == nullptr);
@ -453,7 +491,7 @@ void TransactionDBImpl::RegisterTransaction(Transaction* txn) {
transactions_[txn->GetName()] = txn;
}
void TransactionDBImpl::UnregisterTransaction(Transaction* txn) {
void PessimisticTransactionDB::UnregisterTransaction(Transaction* txn) {
assert(txn);
std::lock_guard<std::mutex> lock(name_map_mutex_);
auto it = transactions_.find(txn->GetName());

57
utilities/transactions/transaction_db_impl.h → utilities/transactions/pessimistic_transaction_db.h
View File

@ -17,25 +17,26 @@
#include "rocksdb/utilities/transaction_db.h"
#include "utilities/transactions/transaction_impl.h"
#include "utilities/transactions/transaction_lock_mgr.h"
#include "utilities/transactions/write_prepared_transaction_impl.h"
namespace rocksdb {
class TransactionDBImpl : public TransactionDB {
class PessimisticTransactionDB : public TransactionDB {
public:
explicit TransactionDBImpl(DB* db,
const TransactionDBOptions& txn_db_options);
explicit PessimisticTransactionDB(DB* db,
const TransactionDBOptions& txn_db_options);
explicit TransactionDBImpl(StackableDB* db,
const TransactionDBOptions& txn_db_options);
explicit PessimisticTransactionDB(StackableDB* db,
const TransactionDBOptions& txn_db_options);
~TransactionDBImpl();
virtual ~PessimisticTransactionDB();
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;
Transaction* old_txn) override = 0;
using StackableDB::Put;
virtual Status Put(const WriteOptions& options,
@ -97,11 +98,12 @@ class TransactionDBImpl : public TransactionDB {
TransactionLockMgr::LockStatusData GetLockStatusData() override;
private:
protected:
void ReinitializeTransaction(
Transaction* txn, const WriteOptions& write_options,
const TransactionOptions& txn_options = TransactionOptions());
private:
DBImpl* db_impl_;
const TransactionDBOptions txn_db_options_;
TransactionLockMgr lock_mgr_;
@ -122,5 +124,44 @@ class TransactionDBImpl : public TransactionDB {
std::unordered_map<TransactionName, Transaction*> transactions_;
};
// 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;
};
// A PessimisticTransactionDB that writes data to DB after prepare phase of 2PC.
// In this way some data in the DB might not be committed. The DB provides
// mechanisms to tell such data apart from committed data.
class WritePreparedTxnDB : public PessimisticTransactionDB {
public:
explicit WritePreparedTxnDB(DB* db,
const TransactionDBOptions& txn_db_options)
: PessimisticTransactionDB(db, txn_db_options) {}
explicit WritePreparedTxnDB(StackableDB* db,
const TransactionDBOptions& txn_db_options)
: PessimisticTransactionDB(db, txn_db_options) {}
virtual ~WritePreparedTxnDB() {}
Transaction* BeginTransaction(const WriteOptions& write_options,
const TransactionOptions& txn_options,
Transaction* old_txn) override;
};
} // namespace rocksdb
#endif // ROCKSDB_LITE

4
utilities/transactions/transaction_impl.cc
View File

@ -22,7 +22,7 @@
#include "util/cast_util.h"
#include "util/string_util.h"
#include "util/sync_point.h"
#include "utilities/transactions/transaction_db_impl.h"
#include "utilities/transactions/pessimistic_transaction_db.h"
#include "utilities/transactions/transaction_util.h"
namespace rocksdb {
@ -48,7 +48,7 @@ PessimisticTxn::PessimisticTxn(TransactionDB* txn_db,
deadlock_detect_(false),
deadlock_detect_depth_(0) {
txn_db_impl_ =
static_cast_with_check<TransactionDBImpl, TransactionDB>(txn_db);
static_cast_with_check<PessimisticTransactionDB, TransactionDB>(txn_db);
db_impl_ = static_cast_with_check<DBImpl, DB>(db_);
Initialize(txn_options);
}

4
utilities/transactions/transaction_impl.h
View File

@ -30,7 +30,7 @@
namespace rocksdb {
class TransactionDBImpl;
class PessimisticTransactionDB;
class PessimisticTxn;
// A transaction under pessimistic concurrency control. This class implements
@ -121,7 +121,7 @@ class PessimisticTxn : public TransactionBaseImpl {
void Clear() override;
TransactionDBImpl* txn_db_impl_;
PessimisticTransactionDB* txn_db_impl_;
DBImpl* db_impl_;
// If non-zero, this transaction should not be committed after this time (in

4
utilities/transactions/transaction_lock_mgr.cc
View File

@ -26,7 +26,7 @@
#include "util/murmurhash.h"
#include "util/sync_point.h"
#include "util/thread_local.h"
#include "utilities/transactions/transaction_db_impl.h"
#include "utilities/transactions/pessimistic_transaction_db.h"
namespace rocksdb {
@ -115,7 +115,7 @@ TransactionLockMgr::TransactionLockMgr(
mutex_factory_(mutex_factory) {
assert(txn_db);
txn_db_impl_ =
static_cast_with_check<TransactionDBImpl, TransactionDB>(txn_db);
static_cast_with_check<PessimisticTransactionDB, TransactionDB>(txn_db);
}
TransactionLockMgr::~TransactionLockMgr() {}

4
utilities/transactions/transaction_lock_mgr.h
View File

@ -27,7 +27,7 @@ struct LockMap;
struct LockMapStripe;
class Slice;
class TransactionDBImpl;
class PessimisticTransactionDB;
class TransactionLockMgr {
public:
@ -61,7 +61,7 @@ class TransactionLockMgr {
LockStatusData GetLockStatusData();
private:
TransactionDBImpl* txn_db_impl_;
PessimisticTransactionDB* txn_db_impl_;
// Default number of lock map stripes per column family
const size_t default_num_stripes_;

2
utilities/transactions/write_prepared_transaction_impl.cc
View File

@ -21,7 +21,7 @@
#include "rocksdb/utilities/transaction_db.h"
#include "util/string_util.h"
#include "util/sync_point.h"
#include "utilities/transactions/transaction_db_impl.h"
#include "utilities/transactions/pessimistic_transaction_db.h"
#include "utilities/transactions/transaction_impl.h"
#include "utilities/transactions/transaction_util.h"