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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5566) client-side NM graceful decom doesn't trigger when jobs finish
Date Fri, 26 Aug 2016 17:30:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-5566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15439437#comment-15439437
] 

Robert Kanter commented on YARN-5566:
-------------------------------------

I've been super busy and haven't had a chance to look at YARN-4676 again.  I've actually been
testing the client-side graceful decom without YARN-4676 applied, so the logic that was removed
by it is actually still there.

I agree that UNHEALTHY isn't a state that should occur if the initial state is DECOMMISSIONING;
as you pointed out, the code doesn't go to UNHEALTHY from DECOMMISSIONG.  That's partly why
I was unsure why my patch fixed the problem; the node never goes to UNHEALTHY, so it doesn't
make sense why that would help.  I'll try to dig into this some more.

> client-side NM graceful decom doesn't trigger when jobs finish
> --------------------------------------------------------------
>
>                 Key: YARN-5566
>                 URL: https://issues.apache.org/jira/browse/YARN-5566
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>    Affects Versions: 2.8.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>         Attachments: YARN-5566.001.patch
>
>
> I was testing the client-side NM graceful decommission and noticed that it was always
waiting for the timeout, even if all jobs running on that node (or even the cluster) had already
finished.
> For example:
> # JobA is running with at least one container on NodeA
> # User runs client-side decom on NodeA at 5:00am with a timeout of 3 hours --> NodeA
enters DECOMMISSIONING state
> # JobA finishes at 6:00am and there are no other jobs running on NodeA
> # User's client reaches the timeout at 8:00am, and forcibly decommissions NodeA
> NodeA should have decommissioned at 6:00am.



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