import org.opendaylight.controller.cluster.raft.PeerInfo;
import org.opendaylight.controller.cluster.raft.RaftActorContext;
import org.opendaylight.controller.cluster.raft.RaftState;
+import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
+import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
import org.opendaylight.controller.cluster.raft.messages.RaftRPC;
import org.opendaylight.controller.cluster.raft.messages.RequestVote;
import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
+import scala.concurrent.duration.FiniteDuration;
/**
* The behavior of a RaftActor when it is in the Candidate raft state.
- * <p/>
+ *
+ * <p>
* Candidates (§5.2):
* <ul>
* <li> On conversion to candidate, start election:
private final Collection<String> votingPeers = new ArrayList<>();
- public Candidate(RaftActorContext context) {
+ public Candidate(final RaftActorContext context) {
super(context, RaftState.Candidate);
for (PeerInfo peer: context.getPeers()) {
}
@Override
- protected RaftActorBehavior handleAppendEntries(ActorRef sender, AppendEntries appendEntries) {
+ protected RaftActorBehavior handleAppendEntries(final ActorRef sender, final AppendEntries 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());
+ 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 handleAppendEntriesReply(ActorRef sender, AppendEntriesReply appendEntriesReply) {
+ protected RaftActorBehavior handleAppendEntriesReply(final ActorRef sender,
+ final AppendEntriesReply appendEntriesReply) {
return this;
}
@Override
- protected RaftActorBehavior handleRequestVoteReply(ActorRef sender, RequestVoteReply requestVoteReply) {
+ protected RaftActorBehavior handleRequestVoteReply(final ActorRef sender, final RequestVoteReply requestVoteReply) {
log.debug("{}: handleRequestVoteReply: {}, current voteCount: {}", logName(), requestVoteReply, voteCount);
if (requestVoteReply.isVoteGranted()) {
if (voteCount >= votesRequired) {
if (context.getLastApplied() < context.getReplicatedLog().lastIndex()) {
- log.debug("{}: LastApplied index {} is behind last index {}", logName(), 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) {
+ protected FiniteDuration electionDuration() {
+ return super.electionDuration().$div(context.getConfigParams().getCandidateElectionTimeoutDivisor());
+ }
+
+
+ @Override
+ final ApplyState getApplyStateFor(final ReplicatedLogEntry entry) {
+ throw new IllegalStateException("A candidate should never attempt to apply " + entry);
+ }
+
+ @Override
+ public RaftActorBehavior handleMessage(final ActorRef sender, final Object message) {
if (message instanceof ElectionTimeout) {
log.debug("{}: Received ElectionTimeout", logName());
// 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
return super.handleMessage(sender, message);
}
-
private void startNewTerm() {
-
-
// set voteCount back to 1 (that is voting for self)
voteCount = 1;
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