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From "Rohith Sharma K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6323) Rolling upgrade/config change is broken on timeline v2.
Date Thu, 10 Aug 2017 08:17:02 GMT

    [ https://issues.apache.org/jira/browse/YARN-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121240#comment-16121240
] 

Rohith Sharma K S commented on YARN-6323:
-----------------------------------------

Going back through whole discussion on this JIRA, continuing on creating a default flow context
and publishing container entities are not at all useful unless RM and NM both creates same
flow context. If we still go ahed with default flow context with RM has flowName as appName
and NM has flowName as appId then both are written into separate rows. From user perspective,
he can't able to retrieve container entities at all anytime unless he gives appId as flowName.
Given this is fine for running applications during upgrade, creating default context make
sense.

> 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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