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From "Ismael Juma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (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
Date Thu, 09 Mar 2017 16:09:38 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903289#comment-15903289
] 

Ismael Juma commented on KAFKA-4433:
------------------------------------

[~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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