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https://issues.apache.org/jira/browse/KAFKA-840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13618868#comment-13618868
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Neha Narkhede commented on KAFKA-840:
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Cool fix for handling the "not started", "started but shutdown" conditions. +1
It's ok to not respond to new topic/new broker zookeeper watches, since on
controller failover, the new controller will read the new topics/brokers and
put them in New state.
> 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
> Affects Versions: 0.8
> Reporter: Swapnil Ghike
> Assignee: Swapnil Ghike
> Priority: Blocker
> Labels: bugs
> Fix For: 0.8
>
> Attachments: 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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