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arangodb/arangod/RocksDBEngine/RocksDBTransactionState.cpp

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////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////
#include "RocksDBTransactionState.h"
#include "Aql/QueryCache.h"
#include "Basics/Exceptions.h"
#include "Cache/CacheManagerFeature.h"
#include "Cache/Manager.h"
#include "Cache/Transaction.h"
#include "Logger/Logger.h"
#include "RestServer/TransactionManagerFeature.h"
#include "RocksDBEngine/RocksDBCollection.h"
#include "RocksDBEngine/RocksDBCommon.h"
#include "RocksDBEngine/RocksDBCounterManager.h"
#include "RocksDBEngine/RocksDBEngine.h"
#include "RocksDBEngine/RocksDBLogValue.h"
#include "RocksDBEngine/RocksDBMethods.h"
#include "RocksDBEngine/RocksDBTransactionCollection.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "StorageEngine/StorageEngine.h"
#include "StorageEngine/TransactionCollection.h"
#include "StorageEngine/TransactionManager.h"
#include "Transaction/Methods.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/modes.h"
#include "VocBase/ticks.h"
#include <rocksdb/db.h>
#include <rocksdb/options.h>
#include <rocksdb/status.h>
#include <rocksdb/utilities/optimistic_transaction_db.h>
#include <rocksdb/utilities/transaction.h>
#include <rocksdb/utilities/write_batch_with_index.h>
using namespace arangodb;
// for the RocksDB engine we do not need any additional data
struct RocksDBTransactionData final : public TransactionData {};
/// @brief transaction type
RocksDBTransactionState::RocksDBTransactionState(
TRI_vocbase_t* vocbase, transaction::Options const& options)
: TransactionState(vocbase, options),
_snapshot(nullptr),
_rocksWriteOptions(),
_rocksReadOptions(),
_cacheTx(nullptr),
_numInserts(0),
_numUpdates(0),
_numRemoves(0),
_lastUsedCollection(0) {}
/// @brief free a transaction container
RocksDBTransactionState::~RocksDBTransactionState() {
if (_cacheTx != nullptr) {
// note: endTransaction() will delete _cacheTrx!
CacheManagerFeature::MANAGER->endTransaction(_cacheTx);
_cacheTx = nullptr;
}
if (_snapshot != nullptr) {
rocksdb::TransactionDB* db = rocksutils::globalRocksDB();
db->ReleaseSnapshot(_snapshot);
_snapshot = nullptr;
}
}
/// @brief start a transaction
Result RocksDBTransactionState::beginTransaction(transaction::Hints hints) {
LOG_TRX(this, _nestingLevel)
<< "beginning " << AccessMode::typeString(_type) << " transaction";
if (_nestingLevel == 0) {
// set hints
_hints = hints;
}
Result result = useCollections(_nestingLevel);
if (result.ok()) {
// all valid
if (_nestingLevel == 0) {
updateStatus(transaction::Status::RUNNING);
}
} else {
// something is wrong
if (_nestingLevel == 0) {
updateStatus(transaction::Status::ABORTED);
}
// free what we have got so far
unuseCollections(_nestingLevel);
return result;
}
if (_nestingLevel == 0) {
// get a new id
_id = TRI_NewTickServer();
// register a protector
auto data =
std::make_unique<RocksDBTransactionData>(); // intentionally empty
TransactionManagerFeature::manager()->registerTransaction(_id,
std::move(data));
TRI_ASSERT(_rocksTransaction == nullptr);
TRI_ASSERT(_cacheTx == nullptr);
// start cache transaction
_cacheTx =
CacheManagerFeature::MANAGER->beginTransaction(isReadOnlyTransaction());
rocksdb::TransactionDB* db = rocksutils::globalRocksDB();
_rocksReadOptions.prefix_same_as_start = true;// should always be true
if (isReadOnlyTransaction()) {
_snapshot = db->GetSnapshot(); // we must call ReleaseSnapshot at some point
_rocksReadOptions.snapshot = _snapshot;
TRI_ASSERT(_snapshot != nullptr);
_rocksMethods.reset(new RocksDBReadOnlyMethods(this));
} else {
createTransaction();
bool readWrites = hasHint(transaction::Hints::Hint::READ_WRITES);
if (!readWrites) {
_snapshot = db->GetSnapshot(); // we must call ReleaseSnapshot at some point
_rocksReadOptions.snapshot = _snapshot;
TRI_ASSERT(_snapshot != nullptr);
} else {
_rocksReadOptions.snapshot = _rocksTransaction->GetSnapshot();
}
_rocksMethods.reset(new RocksDBTrxMethods(this));
}
} else {
TRI_ASSERT(_status == transaction::Status::RUNNING);
}
return result;
}
void RocksDBTransactionState::createTransaction() {
TRI_ASSERT(!_rocksTransaction);
// TODO intermediates
// start rocks transaction
rocksdb::TransactionDB* db = rocksutils::globalRocksDB();
_rocksTransaction.reset(db->BeginTransaction(
_rocksWriteOptions, rocksdb::TransactionOptions()));
_rocksTransaction->SetSnapshot();
if (!hasHint(transaction::Hints::Hint::SINGLE_OPERATION)) {
RocksDBLogValue header =
RocksDBLogValue::BeginTransaction(_vocbase->id(), _id);
_rocksTransaction->PutLogData(header.slice());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
++_numLogdata;
#endif
}
}
arangodb::Result RocksDBTransactionState::internalCommit() {
TRI_ASSERT(_rocksTransaction != nullptr);
arangodb::Result result;
if (_rocksTransaction->GetNumKeys() > 0) {
// set wait for sync flag if required
if (waitForSync()) {
_rocksWriteOptions.sync = true;
_rocksTransaction->SetWriteOptions(_rocksWriteOptions);
}
// double t1 = TRI_microtime();
result = rocksutils::convertStatus(_rocksTransaction->Commit());
// double t2 = TRI_microtime();
// if (t2 - t1 > 0.25) {
// LOG_TOPIC(ERR, Logger::FIXME)
// << "COMMIT TOOK: " << (t2 - t1)
// << " S. NUMINSERTS: " << _numInserts
// << ", NUMUPDATES: " << _numUpdates
// << ", NUMREMOVES: " << _numRemoves
// << ", TRANSACTIONSIZE: " << _transactionSize;
// }
rocksdb::SequenceNumber latestSeq =
rocksutils::globalRocksDB()->GetLatestSequenceNumber();
if (!result.ok()) {
return result;
}
if (_cacheTx != nullptr) {
// note: endTransaction() will delete _cacheTx!
CacheManagerFeature::MANAGER->endTransaction(_cacheTx);
_cacheTx = nullptr;
}
for (auto& trxCollection : _collections) {
RocksDBTransactionCollection* collection =
static_cast<RocksDBTransactionCollection*>(trxCollection);
int64_t adjustment =
collection->numInserts() - collection->numRemoves();
if (collection->numInserts() != 0 || collection->numRemoves() != 0 ||
collection->revision() != 0) {
RocksDBCollection* coll = static_cast<RocksDBCollection*>(
trxCollection->collection()->getPhysical());
coll->adjustNumberDocuments(adjustment);
coll->setRevision(collection->revision());
RocksDBEngine* engine =
static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE);
RocksDBCounterManager::CounterAdjustment update(
latestSeq, collection->numInserts(), collection->numRemoves(),
collection->revision());
engine->counterManager()->updateCounter(coll->objectId(), update);
}
// we need this in case of an intermediate commit. The number of
// initial documents is adjusted and numInserts / removes is set to 0
collection->commitCounts();
}
} else {
// don't write anything if the transaction is empty
result = rocksutils::convertStatus(_rocksTransaction->Rollback());
if (_cacheTx != nullptr) {
// note: endTransaction() will delete _cacheTx!
CacheManagerFeature::MANAGER->endTransaction(_cacheTx);
_cacheTx = nullptr;
}
}
_rocksTransaction.reset();
return result;
}
/// @brief commit a transaction
Result RocksDBTransactionState::commitTransaction(
transaction::Methods* activeTrx) {
LOG_TRX(this, _nestingLevel)
<< "committing " << AccessMode::typeString(_type) << " transaction";
TRI_ASSERT(_status == transaction::Status::RUNNING);
TRI_IF_FAILURE("TransactionWriteCommitMarker") {
return Result(TRI_ERROR_DEBUG);
}
arangodb::Result res;
if (_nestingLevel == 0) {
if (_rocksTransaction != nullptr) {
res = internalCommit();
if (!res.ok()) {
abortTransaction(activeTrx);
}
}
updateStatus(transaction::Status::COMMITTED);
}
unuseCollections(_nestingLevel);
return res;
}
/// @brief abort and rollback a transaction
Result RocksDBTransactionState::abortTransaction(
transaction::Methods* activeTrx) {
LOG_TRX(this, _nestingLevel)
<< "aborting " << AccessMode::typeString(_type) << " transaction";
TRI_ASSERT(_status == transaction::Status::RUNNING);
Result result;
if (_nestingLevel == 0) {
if (_rocksTransaction != nullptr) {
rocksdb::Status status = _rocksTransaction->Rollback();
result = rocksutils::convertStatus(status);
if (_cacheTx != nullptr) {
// note: endTransaction() will delete _cacheTx!
CacheManagerFeature::MANAGER->endTransaction(_cacheTx);
_cacheTx = nullptr;
}
_rocksTransaction.reset();
}
updateStatus(transaction::Status::ABORTED);
if (hasOperations()) {
// must clean up the query cache because the transaction
// may have queried something via AQL that is now rolled back
clearQueryCache();
}
}
unuseCollections(_nestingLevel);
return result;
}
void RocksDBTransactionState::prepareOperation(
TRI_voc_cid_t collectionId, TRI_voc_rid_t revisionId, StringRef const& key,
TRI_voc_document_operation_e operationType) {
TRI_ASSERT(!isReadOnlyTransaction());
bool singleOp = hasHint(transaction::Hints::Hint::SINGLE_OPERATION);
if (collectionId != _lastUsedCollection) {
// single operations should never call this method twice
// singleOp => lastUsedColl == 0
TRI_ASSERT(!singleOp || _lastUsedCollection == 0);
_lastUsedCollection = collectionId;
if (!singleOp) {
if (operationType != TRI_VOC_DOCUMENT_OPERATION_UNKNOWN) {
RocksDBLogValue logValue =
RocksDBLogValue::DocumentOpsPrologue(collectionId);
_rocksTransaction->PutLogData(logValue.slice());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
++_numLogdata;
#endif
}
} else {
// singleOp => no modifications yet
TRI_ASSERT(!singleOp ||
(_rocksTransaction->GetNumPuts() == 0 &&
_rocksTransaction->GetNumDeletes() == 0));
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
TRI_ASSERT(_numLogdata == 0);
#endif
switch (operationType) {
case TRI_VOC_DOCUMENT_OPERATION_INSERT:
case TRI_VOC_DOCUMENT_OPERATION_UPDATE:
case TRI_VOC_DOCUMENT_OPERATION_REPLACE: {
RocksDBLogValue logValue =
RocksDBLogValue::SinglePut(_vocbase->id(), collectionId);
_rocksTransaction->PutLogData(logValue.slice());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
++_numLogdata;
#endif
break;
}
case TRI_VOC_DOCUMENT_OPERATION_REMOVE: {
TRI_ASSERT(!key.empty());
RocksDBLogValue logValue =
RocksDBLogValue::SingleRemove(_vocbase->id(), collectionId, key);
_rocksTransaction->PutLogData(logValue.slice());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
++_numLogdata;
#endif
} break;
case TRI_VOC_DOCUMENT_OPERATION_UNKNOWN:
break;
}
}
}
// we need to log the remove log entry, if we don't have the single
// optimization
if (!singleOp && operationType == TRI_VOC_DOCUMENT_OPERATION_REMOVE) {
RocksDBLogValue logValue = RocksDBLogValue::DocumentRemove(key);
_rocksTransaction->PutLogData(logValue.slice());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
++_numLogdata;
#endif
}
}
/// @brief add an operation for a transaction collection
RocksDBOperationResult RocksDBTransactionState::addOperation(
TRI_voc_cid_t cid, TRI_voc_rid_t revisionId,
TRI_voc_document_operation_e operationType, uint64_t operationSize,
uint64_t keySize) {
RocksDBOperationResult res;
size_t currentSize = _rocksTransaction->GetWriteBatch()->GetWriteBatch()->GetDataSize();
uint64_t newSize = currentSize + operationSize + keySize;
if (newSize > _options.maxTransactionSize) {
// we hit the transaction size limit
std::string message =
"aborting transaction because maximal transaction size limit of " +
std::to_string(_options.maxTransactionSize) + " bytes is reached";
res.reset(TRI_ERROR_RESOURCE_LIMIT, message);
return res;
}
auto collection =
static_cast<RocksDBTransactionCollection*>(findCollection(cid));
if (collection == nullptr) {
std::string message = "collection '" + std::to_string(cid) +
"' not found in transaction state";
THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, message);
}
// should not fail or fail with exception
collection->addOperation(operationType, operationSize, revisionId);
// clear the query cache for this collection
if (arangodb::aql::QueryCache::instance()->mayBeActive()) {
arangodb::aql::QueryCache::instance()->invalidate(
_vocbase, collection->collectionName());
}
switch (operationType) {
case TRI_VOC_DOCUMENT_OPERATION_UNKNOWN:
break;
case TRI_VOC_DOCUMENT_OPERATION_INSERT:
++_numInserts;
break;
case TRI_VOC_DOCUMENT_OPERATION_UPDATE:
case TRI_VOC_DOCUMENT_OPERATION_REPLACE:
++_numUpdates;
break;
case TRI_VOC_DOCUMENT_OPERATION_REMOVE:
++_numRemoves;
break;
}
auto numOperations = _numInserts + _numUpdates + _numRemoves;
// perform an intermediate commit
// this will be done if either the "number of operations" or the
// "transaction size" counters have reached their limit
if (_options.intermediateCommitCount <= numOperations ||
_options.intermediateCommitSize <= newSize) {
LOG_TOPIC(ERR, Logger::FIXME) << "INTERMEDIATE COMMIT!";
internalCommit();
_numInserts = 0;
_numUpdates = 0;
_numRemoves = 0;
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
_numLogdata = 0;
#endif
createTransaction();
}
return res;
}
RocksDBMethods* RocksDBTransactionState::rocksdbMethods() {
TRI_ASSERT(_rocksMethods);
return _rocksMethods.get();
}
uint64_t RocksDBTransactionState::sequenceNumber() const {
if (_snapshot != nullptr) {
return static_cast<uint64_t>(_snapshot->GetSequenceNumber());
} else {
return static_cast<uint64_t>(_rocksTransaction->GetSnapshot()->GetSequenceNumber());
}
}
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