[GitHub] [kafka] jolshan commented on a diff in pull request #12487: KAFKA-14140: Ensure a fenced or in-controlled-shutdown replica is not eligible to join ISR in ZK mode

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jolshan commented on code in PR #12487:
URL: https://github.com/apache/kafka/pull/12487#discussion_r939694944


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core/src/main/scala/kafka/cluster/Partition.scala:
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@@ -881,11 +881,14 @@ class Partition(val topicPartition: TopicPartition,
   private def isReplicaIsrEligible(followerReplicaId: Int): Boolean = {
     metadataCache match {
       // In KRaft mode, only replicas which are not fenced nor in controlled shutdown are
-      // allowed to join the ISR. This does not apply to ZK mode.
+      // allowed to join the ISR. In ZK mode, we just ensure the broker is alive and not shutting down.

Review Comment:
   Yeah -- this was something I was looking into. I'm not sure if there is a way to also exclude shutting down brokers here. Is that also included in the metadata? I can take a look as well.



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