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Date: Wed, 9 Aug 2017 16:47:00 +0000 (UTC)
From: "Rohith Sharma K S (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13050126.1489175372000.129582.1502297220653@Atlassian.JIRA>
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References: <JIRA.13050126.1489175372000@Atlassian.JIRA> <JIRA.13050126.1489175372863@jira-lw-us.apache.org>
Subject: [jira] [Commented] (YARN-6323) Rolling upgrade/config change is
 broken on timeline v2.
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archived-at: Wed, 09 Aug 2017 16:47:08 -0000


    [ https://issues.apache.org/jira/browse/YARN-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120223#comment-16120223 ] 

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

bq. we can possibly write entities for running apps only to v1 and from new apps to v2 so we do not get incomplete app data for some apps from both v1 and v2.
this is very hard to enforce it from RM. RM can't differentiate between recovered apps and newly submitted apps. RM can write into time line server in non exclusive mode for some time period. 

> 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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