ahuang98 commented on code in PR #18240:
URL: https://github.com/apache/kafka/pull/18240#discussion_r1918980033
##########
raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
##########
@@ -882,7 +921,15 @@ private boolean handleVoteResponse(
int remoteNodeId = responseMetadata.source().id();
VoteResponseData response = (VoteResponseData) responseMetadata.data();
Errors topLevelError = Errors.forCode(response.errorCode());
- if (topLevelError != Errors.NONE) {
+ if (topLevelError == Errors.UNSUPPORTED_VERSION &&
quorum.isProspective()) {
+ logger.info(
+ "Prospective received unsupported version error in vote
response in epoch {}, " +
+ "transitioning to Candidate state immediately since entire
quorum may not support PreVote.",
Review Comment:
english is hard 😛 I meant "not the entire quorum" vs "entire quorum does not"
##########
raft/src/test/java/org/apache/kafka/raft/QuorumStateTest.java:
##########
@@ -154,6 +155,163 @@ private ReplicaKey replicaKey(int id, boolean
withDirectoryId) {
return ReplicaKey.of(id, directoryId);
}
+ @ParameterizedTest
+ @EnumSource(value = KRaftVersion.class)
+ public void testHasRemoteLeader(KRaftVersion kraftVersion) {
+ ReplicaKey otherNodeKey = ReplicaKey.of(1, Uuid.randomUuid());
+ VoterSet voters = VoterSetTest.voterSet(Stream.of(localVoterKey,
otherNodeKey));
+
+ QuorumState state = initializeEmptyState(voters, kraftVersion);
+ assertFalse(state.hasRemoteLeader());
+
+ state.transitionToProspective();
+ assertFalse(state.hasRemoteLeader());
+ state.transitionToCandidate();
+ assertFalse(state.hasRemoteLeader());
+
+ state.candidateStateOrThrow().recordGrantedVote(otherNodeKey.id());
+ state.transitionToLeader(0L, accumulator);
+ assertFalse(state.hasRemoteLeader());
+
+ state.transitionToUnattached(state.epoch() + 1, OptionalInt.empty());
+ assertFalse(state.hasRemoteLeader());
+
+ state.unattachedAddVotedState(state.epoch(), otherNodeKey);
+ assertFalse(state.hasRemoteLeader());
+
+ state.transitionToFollower(
+ state.epoch(),
+ otherNodeKey.id(),
+ voters.listeners(otherNodeKey.id())
+ );
+ assertTrue(state.hasRemoteLeader());
+ }
+
+ @ParameterizedTest
+ @EnumSource(value = KRaftVersion.class)
+ public void testHighWatermarkRetained(KRaftVersion kraftVersion) {
+ ReplicaKey otherNodeKey = ReplicaKey.of(1, Uuid.randomUuid());
+ VoterSet voters = VoterSetTest.voterSet(Stream.of(localVoterKey,
otherNodeKey));
+
+ QuorumState state = initializeEmptyState(voters, kraftVersion);
+ state.transitionToFollower(
+ 5,
+ otherNodeKey.id(),
+ voters.listeners(otherNodeKey.id())
+ );
+
+ FollowerState followerState = state.followerStateOrThrow();
+ followerState.updateHighWatermark(OptionalLong.of(10L));
+
+ Optional<LogOffsetMetadata> highWatermark = Optional.of(new
LogOffsetMetadata(10L));
+ assertEquals(highWatermark, state.highWatermark());
+
+ state.transitionToUnattached(6, OptionalInt.empty());
+ assertEquals(highWatermark, state.highWatermark());
+
+ state.unattachedAddVotedState(6, otherNodeKey);
+ assertEquals(highWatermark, state.highWatermark());
+
+ state.transitionToProspective();
+ assertEquals(highWatermark, state.highWatermark());
+
+ state.transitionToCandidate();
+ assertEquals(highWatermark, state.highWatermark());
+
+ CandidateState candidateState = state.candidateStateOrThrow();
+ candidateState.recordGrantedVote(otherNodeKey.id());
+ assertTrue(candidateState.epochElection().isVoteGranted());
+
+ state.transitionToLeader(10L, accumulator);
+ assertEquals(Optional.empty(), state.highWatermark());
Review Comment:
I'll add more details to the Jira - we can decide if it's worth changing
this behavior
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