[jira] [Assigned] (KAFKA-4433) 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

["Mayuresh Gharat (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mayuresh Gharat reassigned KAFKA-4433:
--------------------------------------

    Assignee:     (was: Mayuresh Gharat)

> 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
>            Priority: Critical
>              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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