hachikuji commented on code in PR #12032:
URL: https://github.com/apache/kafka/pull/12032#discussion_r856620950
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core/src/main/scala/kafka/controller/KafkaController.scala:
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@@ -2348,7 +2348,20 @@ class KafkaController(val config: KafkaConfig,
controllerContext.partitionLeadershipInfo(tp) match {
case Some(leaderIsrAndControllerEpoch) =>
val currentLeaderAndIsr =
leaderIsrAndControllerEpoch.leaderAndIsr
- if (newLeaderAndIsr.leaderRecoveryState ==
LeaderRecoveryState.RECOVERING && newLeaderAndIsr.isr.length > 1) {
+ if (newLeaderAndIsr.leaderEpoch <
currentLeaderAndIsr.leaderEpoch) {
+ partitionResponses(tp) = Left(Errors.FENCED_LEADER_EPOCH)
+ None
+ } else if (newLeaderAndIsr.leaderEpoch >
currentLeaderAndIsr.leaderEpoch) {
+ partitionResponses(tp) = Left(Errors.UNKNOWN_LEADER_EPOCH)
Review Comment:
So what I ended up doing is using FENCED_LEADER_EPOCH for any case where the
leader epoch does not match the current value. This is consistent with
`ReplicationControlManager` and it is already handled on the broker side in
`Partition` (unlike `UKNOWN_LEADER_EPOCH`).
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