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https://issues.apache.org/jira/browse/YARN-3231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339264#comment-14339264
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Karthik Kambatla commented on YARN-3231:
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Filed YARN-3271 to move these tests. I am okay with moving these too as part of 
that. I will be glad to review that JIRA too, should anyone want to pick it up.

bq. For 6.3, I don't think there is a problem with "maxRunnableApps for a user 
or queue is decreased".
Would be nice to add the tests even if there is no problem. Seems like a 
logical extension of what the latest patch is doing here. 

> FairScheduler changing queueMaxRunningApps on the fly will cause all pending 
> job stuck
> --------------------------------------------------------------------------------------
>
>                 Key: YARN-3231
>                 URL: https://issues.apache.org/jira/browse/YARN-3231
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Siqi Li
>            Assignee: Siqi Li
>            Priority: Critical
>         Attachments: YARN-3231.v1.patch, YARN-3231.v2.patch, 
> YARN-3231.v3.patch
>
>
> When a queue is piling up with a lot of pending jobs due to the 
> maxRunningApps limit. We want to increase this property on the fly to make 
> some of the pending job active. However, once we increase the limit, all 
> pending jobs were not assigned any resource, and were stuck forever.



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