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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/data_replicator_external_state_impl.h"
#include "mongo/base/init.h"
#include "mongo/db/repl/oplog_buffer_blocking_queue.h"
#include "mongo/db/repl/oplog_buffer_collection.h"
#include "mongo/db/repl/oplog_buffer_proxy.h"
#include "mongo/db/repl/replication_consistency_markers.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl/replication_coordinator_external_state.h"
#include "mongo/db/repl/replication_process.h"
#include "mongo/db/repl/storage_interface.h"
#include "mongo/db/repl/sync_tail.h"
#include "mongo/db/server_parameters.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
namespace {
const char kCollectionOplogBufferName[] = "collection";
const char kBlockingQueueOplogBufferName[] = "inMemoryBlockingQueue";
// Set this to specify whether to use a collection to buffer the oplog on the destination server
// during initial sync to prevent rolling over the oplog.
MONGO_EXPORT_STARTUP_SERVER_PARAMETER(initialSyncOplogBuffer,
std::string,
kCollectionOplogBufferName);
// Set this to specify size of read ahead buffer in the OplogBufferCollection.
MONGO_EXPORT_STARTUP_SERVER_PARAMETER(initialSyncOplogBufferPeekCacheSize, int, 10000);
MONGO_INITIALIZER(initialSyncOplogBuffer)(InitializerContext*) {
if ((initialSyncOplogBuffer != kCollectionOplogBufferName) &&
(initialSyncOplogBuffer != kBlockingQueueOplogBufferName)) {
return Status(ErrorCodes::BadValue,
"unsupported initial sync oplog buffer option: " + initialSyncOplogBuffer);
}
return Status::OK();
}
} // namespace
DataReplicatorExternalStateImpl::DataReplicatorExternalStateImpl(
ReplicationCoordinator* replicationCoordinator,
ReplicationCoordinatorExternalState* replicationCoordinatorExternalState)
: _replicationCoordinator(replicationCoordinator),
_replicationCoordinatorExternalState(replicationCoordinatorExternalState) {}
executor::TaskExecutor* DataReplicatorExternalStateImpl::getTaskExecutor() const {
return _replicationCoordinatorExternalState->getTaskExecutor();
}
OpTimeWithTerm DataReplicatorExternalStateImpl::getCurrentTermAndLastCommittedOpTime() {
if (!_replicationCoordinator->isV1ElectionProtocol()) {
return {OpTime::kUninitializedTerm, OpTime()};
}
return {_replicationCoordinator->getTerm(), _replicationCoordinator->getLastCommittedOpTime()};
}
void DataReplicatorExternalStateImpl::processMetadata(
const rpc::ReplSetMetadata& replMetadata, boost::optional<rpc::OplogQueryMetadata> oqMetadata) {
OpTime newCommitPoint;
// If OplogQueryMetadata was provided, use its values, otherwise use the ones in
// ReplSetMetadata.
if (oqMetadata) {
newCommitPoint = oqMetadata->getLastOpCommitted();
} else {
newCommitPoint = replMetadata.getLastOpCommitted();
}
_replicationCoordinator->advanceCommitPoint(newCommitPoint);
_replicationCoordinator->processReplSetMetadata(replMetadata);
if ((oqMetadata && (oqMetadata->getPrimaryIndex() != rpc::OplogQueryMetadata::kNoPrimary)) ||
(replMetadata.getPrimaryIndex() != rpc::ReplSetMetadata::kNoPrimary)) {
_replicationCoordinator->cancelAndRescheduleElectionTimeout();
}
}
bool DataReplicatorExternalStateImpl::shouldStopFetching(
const HostAndPort& source,
const rpc::ReplSetMetadata& replMetadata,
boost::optional<rpc::OplogQueryMetadata> oqMetadata) {
// Re-evaluate quality of sync target.
if (_replicationCoordinator->shouldChangeSyncSource(source, replMetadata, oqMetadata)) {
// If OplogQueryMetadata was provided, its values were used to determine if we should
// change sync sources.
if (oqMetadata) {
log() << "Canceling oplog query due to OplogQueryMetadata. We have to choose a new "
"sync source. Current source: "
<< source << ", OpTime " << oqMetadata->getLastOpApplied()
<< ", its sync source index:" << oqMetadata->getSyncSourceIndex();
} else {
log() << "Canceling oplog query due to ReplSetMetadata. We have to choose a new sync "
"source. Current source: "
<< source << ", OpTime " << replMetadata.getLastOpVisible()
<< ", its sync source index:" << replMetadata.getSyncSourceIndex();
}
return true;
}
return false;
}
std::unique_ptr<OplogBuffer> DataReplicatorExternalStateImpl::makeInitialSyncOplogBuffer(
OperationContext* opCtx) const {
if (initialSyncOplogBuffer == kCollectionOplogBufferName) {
invariant(initialSyncOplogBufferPeekCacheSize >= 0);
OplogBufferCollection::Options options;
options.peekCacheSize = std::size_t(initialSyncOplogBufferPeekCacheSize);
return stdx::make_unique<OplogBufferProxy>(
stdx::make_unique<OplogBufferCollection>(StorageInterface::get(opCtx), options));
} else {
return stdx::make_unique<OplogBufferBlockingQueue>();
}
}
StatusWith<OplogApplier::Operations> DataReplicatorExternalStateImpl::getNextApplierBatch(
OperationContext* opCtx,
OplogBuffer* oplogBuffer,
const OplogApplier::BatchLimits& batchLimits) {
OplogApplier oplogApplier(
nullptr, oplogBuffer, nullptr, nullptr, nullptr, nullptr, {}, nullptr);
return oplogApplier.getNextApplierBatch(opCtx, batchLimits);
}
StatusWith<ReplSetConfig> DataReplicatorExternalStateImpl::getCurrentConfig() const {
return _replicationCoordinator->getConfig();
}
StatusWith<OpTime> DataReplicatorExternalStateImpl::_multiApply(OperationContext* opCtx,
MultiApplier::Operations ops,
OplogApplier::Observer* observer,
const HostAndPort& source,
ThreadPool* writerPool) {
auto replicationProcess = ReplicationProcess::get(opCtx);
auto consistencyMarkers = replicationProcess->getConsistencyMarkers();
auto storageInterface = StorageInterface::get(opCtx);
SyncTail syncTail(
observer, consistencyMarkers, storageInterface, repl::multiInitialSyncApply, writerPool);
syncTail.setHostname(source.toString());
return syncTail.multiApply(opCtx, std::move(ops));
}
ReplicationCoordinator* DataReplicatorExternalStateImpl::getReplicationCoordinator() const {
return _replicationCoordinator;
}
ReplicationCoordinatorExternalState*
DataReplicatorExternalStateImpl::getReplicationCoordinatorExternalState() const {
return _replicationCoordinatorExternalState;
}
} // namespace repl
} // namespace mongo
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