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https://issues.apache.org/jira/browse/KAFKA-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13666445#comment-13666445
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Neha Narkhede commented on KAFKA-911:
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You are right that we can send the reduced ISR request to the leader, but that
is independent of removing the shutting down broker from the ISR in zookeeper.
I'm arguing that the zookeeper write is unnecessary. To handle the issue you
described, we can send a leader and isr request just to the leader with the
reduced isr.
> Bug in controlled shutdown logic in controller leads to controller not
> sending out some state change request
> -------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-911
> URL: https://issues.apache.org/jira/browse/KAFKA-911
> Project: Kafka
> Issue Type: Bug
> Components: controller
> Affects Versions: 0.8
> Reporter: Neha Narkhede
> Assignee: Neha Narkhede
> Priority: Blocker
> Labels: kafka-0.8, p1
> Attachments: kafka-911-v1.patch
>
>
> The controlled shutdown logic in the controller first tries to move the
> leaders from the broker being shutdown. Then it tries to remove the broker
> from the isr list. During that operation, it does not synchronize on the
> controllerLock. This causes a race condition while dispatching data using the
> controller's channel manager.
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