ahuang98 commented on code in PR #19854:
URL: https://github.com/apache/kafka/pull/19854#discussion_r2226490247
##########
raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
##########
@@ -2569,13 +2569,15 @@ private void maybeTransition(
} else {
transitionToUnattached(epoch, OptionalInt.empty());
}
- } else if (
- leaderId.isPresent() &&
- (!quorum.hasLeader() || leaderEndpoints.size() >
quorum.leaderEndpoints().size())
- ) {
- // The request or response indicates the leader of the current
epoch
- // which are currently unknown or the replica has discovered more
endpoints
- transitionToFollower(epoch, leaderId.getAsInt(), leaderEndpoints,
currentTimeMs);
+ } else if (leaderId.isPresent()) {
+ if (quorum.isFollowerObserver()) {
Review Comment:
There were a few reasons - I'm curious to know what you think
- if the node re-transitions to follower, we need to remove the safeguard
which currently prevents follower to follower transitions without an epoch bump
- we save some extraneous actions which occur in transitionToFollower (e.g.
no need to reset connections or use durable transition, we don't have any new
state like leaderId or votedKey to persist)
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