splett2 commented on code in PR #13765:
URL: https://github.com/apache/kafka/pull/13765#discussion_r1207073563


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core/src/main/scala/kafka/cluster/Partition.scala:
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@@ -1087,12 +1087,14 @@ class Partition(val topicPartition: TopicPartition,
     // avoid unnecessary collection generation
     val leaderLogEndOffset = leaderLog.logEndOffsetMetadata
     var newHighWatermark = leaderLogEndOffset
-    remoteReplicasMap.values.foreach { replica =>
+    remoteReplicasMap.foreachEntry { (replicaId, replica) =>

Review Comment:
   Should we have a test in `PartitionTest` to assert that the HWM is 
incremented when there is a replica that is fenced but caught up?



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