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https://issues.apache.org/jira/browse/YARN-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16119508#comment-16119508
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Rohith Sharma K S commented on YARN-6323:
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thanks Vrushali for reinitiating this thread. However YARN-6736 is planning to
write into both v1 and v2 timelines during upgrade. I think we should make use
of it during rolling upgrade so that RM will publish data into v1 and v2. On NM
restart during upgrade, it is OK for inconsistencies for running applications.
But for newer applications, it should be published properly.
> 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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