jsancio commented on code in PR #18240:
URL: https://github.com/apache/kafka/pull/18240#discussion_r1899633981
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raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
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@@ -2935,14 +3014,18 @@ private long pollResigned(long currentTimeMs) {
// until either the shutdown expires or an election bumps the epoch
stateTimeoutMs = shutdown.remainingTimeMs();
} else if (state.hasElectionTimeoutExpired(currentTimeMs)) {
- if (quorum.isVoter()) {
- transitionToCandidate(currentTimeMs);
- } else {
+// if (quorum.isVoter()) {
+ // canElectNewLeaderAfterOldLeaderPartitioned fails if we do
not bump epoch since it is possible
+ // that the replica ends up as follower in the same epoch.
+ // resigned(leaderId=local) -> prospective(leaderId=local) ->
follower(leaderId=local) which is illegal
+// transitionToProspective(quorum.epoch() + 1, currentTimeMs);
+// transitionToCandidate(currentTimeMs);
+// } else {
Review Comment:
> the existing raft event simulation tests picked up on a new bug in
pollResigned
What is the exact error? Let's add an unittest to one of the
`KafkaRaftClient*Test` suite that shows the bug.
> attempt to become follower of itself in epoch 5.
Let's add a check to `transtitionToFollower` that checks that `leaderId` is
not equal to `localId`.
It makes sense to me that after the resign state the replica should always
increase its epoch. The replica resigned from leadership at epoch X so
eventually the epoch will be at least X + 1. Did you consider transitioning to
candidate and relaxing the transition functions to allow both resigned and
prospective to transition to candidate?
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