Siqi Li commented on YARN-3231:

Hi [~ka...@cloudera.com], thanks for your feedback.

I have updated a new patch which addressed all your comment except 6.1 and 6.3.

For 6.1, it seems that there are other test cases that also might be qualified 
for moving to TestAppRunnability, it would be good to do a larger refactor of 
TestFairScheduler into TestAppRunnability.

For 6.3, I don't think there is a problem with "maxRunnableApps for a user or 
queue is decreased". 

> 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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