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From "Haibo Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6323) Rolling upgrade/config change is broken on timeline v2.
Date Thu, 17 Aug 2017 19:20:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131035#comment-16131035
] 

Haibo Chen commented on YARN-6323:
----------------------------------

Agree with [~vrushalic] on that we should focus on fixing the failure on the upgrade path
from no ATS at all to ATSv2. The inconsistencies between flow name generated by RM and NM
for running applications is probably going to be a limitation.  We can file another jira to
continue to discuss v1->v2 upgrade path.

In RM, the flow name is generated by calling TimelineUtil.generateDefaultFlowName(appName,
appId). If appName is null, the resulting flow name will be like flow_app.getClusterTimestamp()_app.getId().
Can we make it consistent here in NM?

Otherwise, the patch looks good to me.


> 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
>             Fix For: YARN-5355
>
>         Attachments: YARN-6323.001.patch, YARN-6323-YARN-5355.0001.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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