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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3434) Interaction between reservations and userlimit can result in significant ULF violation
Date Wed, 08 Apr 2015 18:56:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-3434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485798#comment-14485798
] 

Thomas Graves commented on YARN-3434:
-------------------------------------

[~wangda] YARN-3243 fixes part of the problem with the max capacities, but it doesn't solve
the user limit side of it.   The user limit check is never done again.  I'll have a patch
up for this shortly I would appreciate it if you could take a look and give me feedback.

> Interaction between reservations and userlimit can result in significant ULF violation
> --------------------------------------------------------------------------------------
>
>                 Key: YARN-3434
>                 URL: https://issues.apache.org/jira/browse/YARN-3434
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Thomas Graves
>            Assignee: Thomas Graves
>
> ULF was set to 1.0
> User was able to consume 1.4X queue capacity.
> It looks like when this application launched, it reserved about 1000 containers, each
8G each, within about 5 seconds. I think this allowed the logic in assignToUser() to allow
the userlimit to be surpassed.



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