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https://issues.apache.org/jira/browse/YARN-3434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14538265#comment-14538265
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Wangda Tan commented on YARN-3434:
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Just read [~aw]'s comment: 
https://issues.apache.org/jira/browse/HADOOP-11746?focusedCommentId=14499458&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14499458.
 Now it can only support branches after branch-2.7. So I will run all RM tests 
locally for YARN-3434 and commit.

> 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
>             Fix For: 2.8.0
>
>         Attachments: YARN-3434-branch2.7.patch, YARN-3434.patch, 
> YARN-3434.patch, YARN-3434.patch, YARN-3434.patch, YARN-3434.patch, 
> YARN-3434.patch, YARN-3434.patch
>
>
> 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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