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https://issues.apache.org/jira/browse/KAFKA-2402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654145#comment-14654145
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Ashish K Singh commented on KAFKA-2402:
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[~becket_qin] the patch looks good. However, would it be possible to add an
unit test.
> Broker should create zkpath /isr_change_notification if it does not exist.
> --------------------------------------------------------------------------
>
> Key: KAFKA-2402
> URL: https://issues.apache.org/jira/browse/KAFKA-2402
> Project: Kafka
> Issue Type: Bug
> Reporter: Jiangjie Qin
> Assignee: Jiangjie Qin
>
> This is a follow up patch for KAFKA-1367.
> When broker update ISR of partitions, it should ensure zkPath
> /isr_change_notification exist. This does not matter when users do a clean
> deploy of Kafka cluster because controller will always create the cluster.
> But it matters when users are doing a rolling upgrade since the controller
> could still be running on a old version broker. In that case,
> ZkNoNodeException will be thrown and replica fetching will fail.
> We can either document the upgrade process to ask user create the zk path
> manually before upgrade or preferably we can handle it in the code.
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