void ReplSetImpl::_assumePrimary() {
LOG(1) << "replSet assuming primary" << endl;
verify(iAmPotentiallyHot());
// Wait for replication to stop and buffer to be consumed
LOG(1) << "replSet waiting for replication to finish before becoming primary" << endl;
BackgroundSync::get()->stopReplicationAndFlushBuffer();
// Lock here to prevent stepping down & becoming primary from getting interleaved
LOG(1) << "replSet waiting for global write lock";
OperationContextImpl txn; // XXX?
Lock::GlobalWrite lk(txn.lockState());
initOpTimeFromOplog(&txn, "local.oplog.rs");
// Generate new election unique id
elect.setElectionId(OID::gen());
LOG(1) << "replSet truly becoming primary";
changeState(MemberState::RS_PRIMARY);
// This must be done after becoming primary but before releasing the write lock. This adds
// the dropCollection entries for every temp collection to the opLog since we want it to be
// replicated to secondaries.
dropAllTempCollections(&txn);
}
OpTime ReplicationCoordinatorExternalStateImpl::onTransitionToPrimary(OperationContext* txn,
bool isV1ElectionProtocol) {
// Clear the appliedThrough marker so on startup we'll use the top of the oplog. This must be
// done before we add anything to our oplog.
invariant(_storageInterface->getOplogDeleteFromPoint(txn).isNull());
_storageInterface->setAppliedThrough(txn, {});
if (isV1ElectionProtocol) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction scopedXact(txn, MODE_X);
WriteUnitOfWork wuow(txn);
txn->getClient()->getServiceContext()->getOpObserver()->onOpMessage(
txn,
BSON("msg"
<< "new primary"));
wuow.commit();
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(
txn, "logging transition to primary to oplog", "local.oplog.rs");
}
const auto opTimeToReturn = fassertStatusOK(28665, loadLastOpTime(txn));
shardingOnTransitionToPrimaryHook(txn);
dropAllTempCollections(txn);
return opTimeToReturn;
}
