[GitHub] [kafka] junrao commented on a change in pull request #8524: KAFKA-9866: Avoid election for topics where preferred leader is not in ISR

[GitBox]

junrao commented on a change in pull request #8524:
URL: https://github.com/apache/kafka/pull/8524#discussion_r413436495



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File path: core/src/main/scala/kafka/controller/KafkaController.scala
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@@ -1068,7 +1068,9 @@ class KafkaController(val config: KafkaConfig,
         val candidatePartitions = topicsNotInPreferredReplica.keys.filter(tp 
=> controllerContext.isReplicaOnline(leaderBroker, tp) &&
           controllerContext.partitionsBeingReassigned.isEmpty &&
           !topicDeletionManager.isTopicQueuedUpForDeletion(tp.topic) &&
-          controllerContext.allTopics.contains(tp.topic))
+          controllerContext.allTopics.contains(tp.topic) &&
+          controllerContext.partitionLeadershipInfo.get(tp).forall(l => 
l.leaderAndIsr.isr.contains(leaderBroker))

Review comment:
       The preferred leader election also checks for live brokers. So, perhaps 
we could just call 
PartitionLeaderElectionAlgorithms.preferredReplicaPartitionLeaderElection() 
here.




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