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From "Swapnil Ghike (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-840) Controller tries to perform preferred replica election on failover before state machines have started up
Date Tue, 02 Apr 2013 19:31:16 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620165#comment-13620165
] 

Swapnil Ghike commented on KAFKA-840:
-------------------------------------

Makes sense. Should we also de-register the topic/broker change listeners when the partition/replica
state machines are shutting down?
                
> Controller tries to perform preferred replica election on failover before state machines
have started up
> --------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-840
>                 URL: https://issues.apache.org/jira/browse/KAFKA-840
>             Project: Kafka
>          Issue Type: Bug
>          Components: controller
>    Affects Versions: 0.8
>            Reporter: Swapnil Ghike
>            Assignee: Swapnil Ghike
>            Priority: Blocker
>              Labels: bugs
>             Fix For: 0.8
>
>         Attachments: kafka-840-after-commit-v1.patch, kafka-840.patch, kafka-840-v2.patch
>
>
> If the admin/preferred_replica_election path is non-empty when a new controller starts,
the controller attempts to perform preferred replica election before the partition and replica
state machine have been initialized. In this case, the controller will try to make invalid
state transitions. 

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