void ReplicationCoordinatorImpl::_onVoteRequestComplete(long long originalTerm) {
invariant(_voteRequester);
invariant(!_electionWinnerDeclarer);
LoseElectionGuardV1 lossGuard(this);
if (_topCoord->getTerm() != originalTerm) {
log() << "not becoming primary, we have been superceded already";
return;
}
const VoteRequester::VoteRequestResult endResult = _voteRequester->getResult();
if (endResult == VoteRequester::InsufficientVotes) {
log() << "not becoming primary, we received insufficient votes";
return;
} else if (endResult == VoteRequester::StaleTerm) {
log() << "not becoming primary, we have been superceded already";
return;
} else if (endResult != VoteRequester::SuccessfullyElected) {
log() << "not becoming primary, we received an unexpected problem";
return;
}
log() << "election succeeded, assuming primary role in term " << _topCoord->getTerm();
// Prevent last committed optime from updating until we finish draining.
_setFirstOpTimeOfMyTerm(
OpTime(Timestamp(std::numeric_limits<int>::max(), 0), std::numeric_limits<int>::max()));
_performPostMemberStateUpdateAction(kActionWinElection);
_voteRequester.reset(nullptr);
_replExecutor.signalEvent(_electionFinishedEvent);
lossGuard.dismiss();
}
void ReplicationCoordinatorImpl::_heartbeatReconfigFinish(
const ReplicationExecutor::CallbackData& cbData,
const ReplicaSetConfig& newConfig,
StatusWith<int> myIndex) {
if (cbData.status == ErrorCodes::CallbackCanceled) {
return;
}
boost::unique_lock<boost::mutex> lk(_mutex);
invariant(_rsConfigState == kConfigHBReconfiguring);
invariant(!_rsConfig.isInitialized() ||
_rsConfig.getConfigVersion() < newConfig.getConfigVersion());
if (_getMemberState_inlock().primary() && !cbData.txn) {
// Not having an OperationContext in the CallbackData means we definitely aren't holding
// the global lock. Since we're primary and this reconfig could cause us to stepdown,
// reschedule this work with the global exclusive lock so the stepdown is safe.
// TODO(spencer): When we *do* have an OperationContext, consult it to confirm that
// we are indeed holding the global lock.
_replExecutor.scheduleWorkWithGlobalExclusiveLock(
stdx::bind(&ReplicationCoordinatorImpl::_heartbeatReconfigFinish,
this,
stdx::placeholders::_1,
newConfig,
myIndex));
return;
}
if (!myIndex.isOK()) {
switch (myIndex.getStatus().code()) {
case ErrorCodes::NodeNotFound:
log() << "Cannot find self in new replica set configuration; I must be removed; " <<
myIndex.getStatus();
break;
case ErrorCodes::DuplicateKey:
error() << "Several entries in new config represent this node; "
"Removing self until an acceptable configuration arrives; " <<
myIndex.getStatus();
break;
default:
error() << "Could not validate configuration received from remote node; "
"Removing self until an acceptable configuration arrives; " <<
myIndex.getStatus();
break;
}
myIndex = StatusWith<int>(-1);
}
const PostMemberStateUpdateAction action =
_setCurrentRSConfig_inlock(newConfig, myIndex.getValue());
lk.unlock();
_performPostMemberStateUpdateAction(action);
}
void ReplicationCoordinatorImpl::_onElectCmdRunnerComplete() {
stdx::unique_lock<stdx::mutex> lk(_mutex);
LoseElectionGuard lossGuard(_topCoord.get(),
_replExecutor.get(),
&_freshnessChecker,
&_electCmdRunner,
&_electionFinishedEvent);
invariant(_freshnessChecker);
invariant(_electCmdRunner);
if (_electCmdRunner->isCanceled()) {
LOG(2) << "Election canceled during elect self phase";
return;
}
const int receivedVotes = _electCmdRunner->getReceivedVotes();
if (receivedVotes < _rsConfig.getMajorityVoteCount()) {
log() << "couldn't elect self, only received " << receivedVotes
<< " votes, but needed at least " << _rsConfig.getMajorityVoteCount();
// Suppress ourselves from standing for election again, giving other nodes a chance
// to win their elections.
const auto ms = Milliseconds(_nextRandomInt64_inlock(1000) + 50);
const Date_t now(_replExecutor->now());
const Date_t nextCandidateTime = now + ms;
log() << "waiting until " << nextCandidateTime << " before standing for election again";
_topCoord->setElectionSleepUntil(nextCandidateTime);
_scheduleWorkAt(nextCandidateTime,
stdx::bind(&ReplicationCoordinatorImpl::_recoverFromElectionTie,
this,
stdx::placeholders::_1));
return;
}
if (_rsConfig.getConfigVersion() != _freshnessChecker->getOriginalConfigVersion()) {
log() << "config version changed during our election, ignoring result";
return;
}
log() << "election succeeded, assuming primary role";
lossGuard.dismiss();
_freshnessChecker.reset(NULL);
_electCmdRunner.reset(NULL);
auto electionFinishedEvent = _electionFinishedEvent;
lk.unlock();
_performPostMemberStateUpdateAction(kActionWinElection);
_replExecutor->signalEvent(electionFinishedEvent);
}
void ReplicationCoordinatorImpl::_onVoteRequestComplete(long long originalTerm) {
invariant(_voteRequester);
LoseElectionGuardV1 lossGuard(this);
LockGuard lk(_topoMutex);
if (_topCoord->getTerm() != originalTerm) {
log() << "not becoming primary, we have been superceded already";
return;
}
const VoteRequester::Result endResult = _voteRequester->getResult();
switch (endResult) {
case VoteRequester::Result::kInsufficientVotes:
log() << "not becoming primary, we received insufficient votes";
return;
case VoteRequester::Result::kStaleTerm:
log() << "not becoming primary, we have been superceded already";
return;
case VoteRequester::Result::kSuccessfullyElected:
log() << "election succeeded, assuming primary role in term " << _topCoord->getTerm();
break;
}
{
// Mark all nodes that responded to our vote request as up to avoid immediately
// relinquishing primary.
stdx::lock_guard<stdx::mutex> lk(_mutex);
Date_t now = _replExecutor.now();
const unordered_set<HostAndPort> liveNodes = _voteRequester->getResponders();
for (auto& nodeInfo : _slaveInfo) {
if (liveNodes.count(nodeInfo.hostAndPort)) {
nodeInfo.down = false;
nodeInfo.lastUpdate = now;
}
}
}
// Prevent last committed optime from updating until we finish draining.
_setFirstOpTimeOfMyTerm(
OpTime(Timestamp(std::numeric_limits<int>::max(), 0), std::numeric_limits<int>::max()));
_performPostMemberStateUpdateAction(kActionWinElection);
_voteRequester.reset(nullptr);
_replExecutor.signalEvent(_electionFinishedEvent);
lossGuard.dismiss();
}
void ReplicationCoordinatorImpl::_heartbeatStepDownFinish(
const ReplicationExecutor::CallbackData& cbData) {
if (cbData.status == ErrorCodes::CallbackCanceled) {
return;
}
invariant(cbData.txn);
// TODO Add invariant that we've got global shared or global exclusive lock, when supported
// by lock manager.
boost::unique_lock<boost::mutex> lk(_mutex);
_topCoord->stepDownIfPending();
const PostMemberStateUpdateAction action =
_updateMemberStateFromTopologyCoordinator_inlock();
lk.unlock();
_performPostMemberStateUpdateAction(action);
}
void ReplicationCoordinatorImpl::_onVoteRequestComplete(long long originalTerm) {
invariant(_voteRequester);
invariant(!_electionWinnerDeclarer);
LoseElectionGuardV1 lossGuard(_topCoord.get(),
&_replExecutor,
&_voteRequester,
&_electionWinnerDeclarer,
&_electionFinishedEvent);
if (_topCoord->getTerm() != originalTerm) {
log() << "not becoming primary, we have been superceded already";
return;
}
const VoteRequester::VoteRequestResult endResult = _voteRequester->getResult();
if (endResult == VoteRequester::InsufficientVotes) {
log() << "not becoming primary, we received insufficient votes";
return;
}
else if (endResult == VoteRequester::StaleTerm) {
log() << "not becoming primary, we have been superceded already";
return;
}
else if (endResult != VoteRequester::SuccessfullyElected) {
log() << "not becoming primary, we received an unexpected problem";
return;
}
log() << "election succeeded, assuming primary role";
_performPostMemberStateUpdateAction(kActionWinElection);
_electionWinnerDeclarer.reset(new ElectionWinnerDeclarer);
StatusWith<ReplicationExecutor::EventHandle> nextPhaseEvh = _electionWinnerDeclarer->start(
&_replExecutor,
_rsConfig.getReplSetName(),
_rsConfig.getMemberAt(_selfIndex).getId(),
_topCoord->getTerm(),
_topCoord->getMaybeUpHostAndPorts(),
stdx::bind(&ReplicationCoordinatorImpl::_onElectionWinnerDeclarerComplete, this));
if (nextPhaseEvh.getStatus() == ErrorCodes::ShutdownInProgress) {
return;
}
fassert(28644, nextPhaseEvh.getStatus());
lossGuard.dismiss();
}
void ReplicationCoordinatorImpl::_onVoteRequestComplete(long long newTerm) {
stdx::unique_lock<stdx::mutex> lk(_mutex);
LoseElectionGuardV1 lossGuard(this);
invariant(_voteRequester);
if (_topCoord->getTerm() != newTerm) {
log() << "not becoming primary, we have been superseded already during election. "
<< "election term: " << newTerm << ", current term: " << _topCoord->getTerm();
return;
}
const VoteRequester::Result endResult = _voteRequester->getResult();
invariant(endResult != VoteRequester::Result::kPrimaryRespondedNo);
switch (endResult) {
case VoteRequester::Result::kInsufficientVotes:
log() << "not becoming primary, we received insufficient votes";
return;
case VoteRequester::Result::kStaleTerm:
log() << "not becoming primary, we have been superseded already";
return;
case VoteRequester::Result::kSuccessfullyElected:
log() << "election succeeded, assuming primary role in term " << _topCoord->getTerm();
break;
case VoteRequester::Result::kPrimaryRespondedNo:
// This is impossible because we would only require the primary's
// vote during a dry run.
invariant(false);
}
// Mark all nodes that responded to our vote request as up to avoid immediately
// relinquishing primary.
Date_t now = _replExecutor->now();
_topCoord->resetMemberTimeouts(now, _voteRequester->getResponders());
_voteRequester.reset();
auto electionFinishedEvent = _electionFinishedEvent;
lk.unlock();
_performPostMemberStateUpdateAction(kActionWinElection);
_replExecutor->signalEvent(electionFinishedEvent);
lossGuard.dismiss();
}
void ReplicationCoordinatorImpl::_handleHeartbeatResponseAction(
const HeartbeatResponseAction& action,
const StatusWith<ReplSetHeartbeatResponse>& responseStatus) {
switch (action.getAction()) {
case HeartbeatResponseAction::NoAction:
// Update the cached member state if different than the current topology member state
if (_memberState != _topCoord->getMemberState()) {
boost::unique_lock<boost::mutex> lk(_mutex);
const PostMemberStateUpdateAction postUpdateAction =
_updateMemberStateFromTopologyCoordinator_inlock();
lk.unlock();
_performPostMemberStateUpdateAction(postUpdateAction);
}
break;
case HeartbeatResponseAction::Reconfig:
invariant(responseStatus.isOK());
_scheduleHeartbeatReconfig(responseStatus.getValue().getConfig());
break;
case HeartbeatResponseAction::StartElection:
if (isV1ElectionProtocol()) {
_startElectSelfV1();
}
else {
_startElectSelf();
}
break;
case HeartbeatResponseAction::StepDownSelf:
invariant(action.getPrimaryConfigIndex() == _selfIndex);
_heartbeatStepDownStart();
break;
case HeartbeatResponseAction::StepDownRemotePrimary: {
invariant(action.getPrimaryConfigIndex() != _selfIndex);
_requestRemotePrimaryStepdown(
_rsConfig.getMemberAt(action.getPrimaryConfigIndex()).getHostAndPort());
break;
}
default:
severe() << "Illegal heartbeat response action code " << int(action.getAction());
invariant(false);
}
}
