void ReplicationCoordinatorExternalStateImpl::startThreads(const ReplSettings& settings) {
stdx::lock_guard<stdx::mutex> lk(_threadMutex);
if (_startedThreads) {
return;
}
log() << "Starting replication storage threads";
if (settings.isMajorityReadConcernEnabled() || enableReplSnapshotThread) {
_snapshotThread = SnapshotThread::start(getGlobalServiceContext());
}
getGlobalServiceContext()->getGlobalStorageEngine()->setJournalListener(this);
_writerPool = SyncTail::makeWriterPool();
_startedThreads = true;
}
void ReplicationCoordinatorExternalStateImpl::startThreads(const ReplSettings& settings) {
stdx::lock_guard<stdx::mutex> lk(_threadMutex);
if (_startedThreads) {
return;
}
log() << "Starting replication storage threads";
if (settings.isMajorityReadConcernEnabled() || enableReplSnapshotThread) {
_snapshotThread = SnapshotThread::start(getGlobalServiceContext());
}
getGlobalServiceContext()->getGlobalStorageEngine()->setJournalListener(this);
_taskExecutor = stdx::make_unique<executor::ThreadPoolTaskExecutor>(
makeThreadPool(), executor::makeNetworkInterface("NetworkInterfaceASIO-RS"));
_taskExecutor->startup();
_writerPool = SyncTail::makeWriterPool();
_storageInterface->startup();
_startedThreads = true;
}
void runSyncThread() {
Client::initThread("rsSync");
AuthorizationSession::get(cc())->grantInternalAuthorization();
ReplicationCoordinator* replCoord = getGlobalReplicationCoordinator();
// Overwrite prefetch index mode in BackgroundSync if ReplSettings has a mode set.
ReplSettings replSettings = replCoord->getSettings();
if (replSettings.isPrefetchIndexModeSet())
BackgroundSync::get()->setIndexPrefetchConfig(replSettings.getPrefetchIndexMode());
while (!inShutdown()) {
// After a reconfig, we may not be in the replica set anymore, so
// check that we are in the set (and not an arbiter) before
// trying to sync with other replicas.
// TODO(spencer): Use a condition variable to await loading a config
if (replCoord->getMemberState().startup()) {
warning() << "did not receive a valid config yet";
sleepsecs(1);
continue;
}
const MemberState memberState = replCoord->getMemberState();
// An arbiter can never transition to any other state, and doesn't replicate, ever
if (memberState.arbiter()) {
break;
}
// If we are removed then we don't belong to the set anymore
if (memberState.removed()) {
sleepsecs(5);
continue;
}
try {
if (memberState.primary() && !replCoord->isWaitingForApplierToDrain()) {
sleepsecs(1);
continue;
}
bool initialSyncRequested = BackgroundSync::get()->getInitialSyncRequestedFlag();
// Check criteria for doing an initial sync:
// 1. If the oplog is empty, do an initial sync
// 2. If minValid has _initialSyncFlag set, do an initial sync
// 3. If initialSyncRequested is true
if (getGlobalReplicationCoordinator()->getMyLastOptime().isNull() ||
getInitialSyncFlag() || initialSyncRequested) {
syncDoInitialSync();
continue; // start from top again in case sync failed.
}
if (!replCoord->setFollowerMode(MemberState::RS_RECOVERING)) {
continue;
}
/* we have some data. continue tailing. */
SyncTail tail(BackgroundSync::get(), multiSyncApply);
tail.oplogApplication();
} catch (...) {
std::terminate();
}
}
}
