kevin-wu24 commented on code in PR #20354:
URL: https://github.com/apache/kafka/pull/20354#discussion_r2278894794
##########
raft/src/main/java/org/apache/kafka/raft/KafkaRaftClient.java:
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@@ -3356,17 +3352,13 @@ private long pollFollowerAsObserver(FollowerState
state, long currentTimeMs) {
} else {
sendResult = maybeSendAddVoterRequest(state, currentTimeMs);
}
- backoffMs = sendResult.timeToWaitMs();
if (sendResult.requestSent()) {
state.resetUpdateVoterSetPeriod(currentTimeMs);
}
+ return sendResult.timeToWaitMs();
Review Comment:
The observer does not need to consider the time left on the fetch timer when
calculating the backoff, because an observer cannot transition to
prospective/candidate state. It must transition to follower state first.
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