import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
/**
- * The behavior of a RaftActor when it is in the CandidateState
- * <p/>
+ * The behavior of a RaftActor when it is in the Candidate raft state.
+ *
+ * <p>
* Candidates (§5.2):
* <ul>
* <li> On conversion to candidate, start election:
public Candidate(RaftActorContext context) {
super(context, RaftState.Candidate);
- for(PeerInfo peer: context.getPeers()) {
- if(peer.isVoting()) {
+ for (PeerInfo peer: context.getPeers()) {
+ if (peer.isVoting()) {
votingPeers.add(peer.getId());
}
}
- if(LOG.isDebugEnabled()) {
- LOG.debug("{}: Election: Candidate has following voting peers: {}", logName(), votingPeers);
- }
+ log.debug("{}: Election: Candidate has following voting peers: {}", logName(), votingPeers);
votesRequired = getMajorityVoteCount(votingPeers.size());
startNewTerm();
- if(votingPeers.isEmpty()){
+ if (votingPeers.isEmpty()) {
actor().tell(ElectionTimeout.INSTANCE, actor());
} else {
scheduleElection(electionDuration());
}
@Override
- protected RaftActorBehavior handleAppendEntries(ActorRef sender,
- AppendEntries appendEntries) {
+ protected RaftActorBehavior handleAppendEntries(ActorRef sender, AppendEntries appendEntries) {
- if(LOG.isDebugEnabled()) {
- LOG.debug("{}: handleAppendEntries: {}", logName(), appendEntries);
- }
+ log.debug("{}: handleAppendEntries: {}", logName(), appendEntries);
// Some other candidate for the same term became a leader and sent us an append entry
- if(currentTerm() == appendEntries.getTerm()){
- LOG.debug("{}: New Leader sent an append entry to Candidate for term {} will switch to Follower",
- logName(), currentTerm());
+ if (currentTerm() == appendEntries.getTerm()) {
+ log.info("{}: New Leader {} sent an AppendEntries to Candidate for term {} - will switch to Follower",
+ logName(), appendEntries.getLeaderId(), currentTerm());
return switchBehavior(new Follower(context));
}
@Override
protected RaftActorBehavior handleRequestVoteReply(ActorRef sender, RequestVoteReply requestVoteReply) {
- LOG.debug("{}: handleRequestVoteReply: {}, current voteCount: {}", logName(), requestVoteReply, voteCount);
+ log.debug("{}: handleRequestVoteReply: {}, current voteCount: {}", logName(), requestVoteReply, voteCount);
if (requestVoteReply.isVoteGranted()) {
voteCount++;
}
if (voteCount >= votesRequired) {
- if(context.getCommitIndex() < context.getReplicatedLog().lastIndex()) {
- LOG.debug("{}: Connmit index {} is behind last index {}", logName(), context.getCommitIndex(),
- context.getReplicatedLog().lastIndex());
+ if (context.getLastApplied() < context.getReplicatedLog().lastIndex()) {
+ log.info("{}: LastApplied index {} is behind last index {} - switching to PreLeader",
+ logName(), context.getLastApplied(), context.getReplicatedLog().lastIndex());
return internalSwitchBehavior(RaftState.PreLeader);
} else {
return internalSwitchBehavior(RaftState.Leader);
@Override
public RaftActorBehavior handleMessage(ActorRef sender, Object message) {
if (message instanceof ElectionTimeout) {
- LOG.debug("{}: Received ElectionTimeout", logName());
+ log.debug("{}: Received ElectionTimeout", logName());
if (votesRequired == 0) {
// If there are no peers then we should be a Leader
RaftRPC rpc = (RaftRPC) message;
- if(LOG.isDebugEnabled()) {
- LOG.debug("{}: RaftRPC message received {}, my term is {}", logName(), rpc,
+ log.debug("{}: RaftRPC message received {}, my term is {}", logName(), rpc,
context.getTermInformation().getCurrentTerm());
- }
// If RPC request or response contains term T > currentTerm:
// set currentTerm = T, convert to follower (§5.1)
// This applies to all RPC messages and responses
if (rpc.getTerm() > context.getTermInformation().getCurrentTerm()) {
+ log.info("{}: Term {} in \"{}\" message is greater than Candidate's term {} - switching to Follower",
+ logName(), rpc.getTerm(), rpc, context.getTermInformation().getCurrentTerm());
+
context.getTermInformation().updateAndPersist(rpc.getTerm(), null);
// The raft paper does not say whether or not a Candidate can/should process a RequestVote in
long newTerm = currentTerm + 1;
context.getTermInformation().updateAndPersist(newTerm, context.getId());
- LOG.debug("{}: Starting new term {}", logName(), newTerm);
+ log.info("{}: Starting new election term {}", logName(), newTerm);
// Request for a vote
// TODO: Retry request for vote if replies do not arrive in a reasonable
// amount of time TBD
for (String peerId : votingPeers) {
ActorSelection peerActor = context.getPeerActorSelection(peerId);
- if(peerActor != null) {
+ if (peerActor != null) {
RequestVote requestVote = new RequestVote(
context.getTermInformation().getCurrentTerm(),
context.getId(),
context.getReplicatedLog().lastIndex(),
context.getReplicatedLog().lastTerm());
- LOG.debug("{}: Sending {} to peer {}", logName(), requestVote, peerId);
+ log.debug("{}: Sending {} to peer {}", logName(), requestVote, peerId);
peerActor.tell(requestVote, context.getActor());
}