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https://issues.apache.org/jira/browse/KAFKA-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903289#comment-15903289
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Ismael Juma commented on KAFKA-4433:
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[~mgharat], are you working on this?
> Kafka Controller Does not send a LeaderAndIsr to old leader of a
> topicPartition during reassignment, if the old leader is not a part of the
> new assigned replicas
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-4433
> URL: https://issues.apache.org/jira/browse/KAFKA-4433
> Project: Kafka
> Issue Type: Bug
> Components: controller
> Reporter: Mayuresh Gharat
> Assignee: Mayuresh Gharat
> Labels: reliability
>
> Consider the following scenario :
> old replicas : {[1,2,3], Leader = 1} is reassigned to new replicas :
> {[2,3,4], Leader = 2}
> In this case broker 1 does not receive a LeaderAndIsr request to become a
> follower.
> This happens because of the following :
> val (leaderAndIsr, replicas) = leaderSelector.selectLeader(topicAndPartition,
> currentLeaderAndIsr) in PartitionStateMachine.electLeaderForPartition(...) ,
> the replicas returned by ReassignedPartitionLeaderSelector.selectLeader() is
> only the new Replicas, which are then sent the LeaderAndIsrRequest. So the
> old replica never receives this LeaderAndIsr.
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