kevin-wu24 commented on code in PR #22111:
URL: https://github.com/apache/kafka/pull/22111#discussion_r3311688143
##########
raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
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@@ -2608,6 +2615,32 @@ private boolean hasConsistentLeader(int epoch,
OptionalInt leaderId) {
}
}
+ /**
+ * If the local replica is an observer currently routing fetches to
bootstrap servers,
+ * and a non-leader source's fetch response advertises the leader's
endpoints, switch
+ * the observer back to fetching from the leader.
+ */
+ private void maybeSwitchObserverFetchToLeader(
+ int responseEpoch,
+ OptionalInt responseLeaderId,
+ Endpoints leaderEndpoints,
+ long currentTimeMs
+ ) {
+ if (!hasConsistentLeader(responseEpoch, responseLeaderId)) {
+ throw new IllegalStateException("Received request or response with
leader " + responseLeaderId +
Review Comment:
I followed the other usage of `hasConsistentLeader`, which uses
`quorum.localId()`. If the local leader is empty, `hasConsistentLeader` returns
`true`.
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