kevin-wu24 commented on code in PR #22111:
URL: https://github.com/apache/kafka/pull/22111#discussion_r3424122720
##########
raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
##########
@@ -1725,6 +1725,13 @@ private boolean handleFetchResponse(
leaderEndpoints = Endpoints.empty();
}
+ maybeSwitchObserverFetchToLeader(
+ responseEpoch,
+ responseLeaderId,
+ leaderEndpoints,
+ currentTimeMs
+ );
Review Comment:
I am checking:
```
else if (responseEpoch == quorum.epoch() && quorum.isUnattached() &&
responseLeaderId.isPresent() && !leaderEndpoints.isEmpty()) {
```
in this method. This handler and logic only applies to nodes in the
`Unattached` state, which can only fetch from the bootstrap servers. A follower
whose fetch timeout has expired transitions to `Unattached` and then can only
send `Fetch`.
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