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https://issues.apache.org/jira/browse/YARN-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121098#comment-16121098
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Rohith Sharma K S commented on YARN-6323:
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Ahh.. I remember the discussion Vrushali. Thanks for pointed out. Thats true
that NM start will fail if flow context is null. Current patch looks reasonable
to me. I will take a detailed look at the patch.
> Rolling upgrade/config change is broken on timeline v2.
> --------------------------------------------------------
>
> Key: YARN-6323
> URL: https://issues.apache.org/jira/browse/YARN-6323
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Li Lu
> Assignee: Vrushali C
> Labels: yarn-5355-merge-blocker
> Attachments: YARN-6323.001.patch
>
>
> Found this issue when deploying on real clusters. If there are apps running
> when we enable timeline v2 (with work preserving restart enabled), node
> managers will fail to start due to missing app context data. We should
> probably assign some default names to these "left over" apps. I believe it's
> suboptimal to let users clean up the whole cluster before enabling timeline
> v2.
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