Sunil G commented on YARN-3873:

Thank you [~leftnoteasy] for sharing your thoughts.

I definitely agree to your view on the problem in using a FairComparator on 
pendingApplications. As mentioned, it is better to come with a customized 
comparator which can help to select which application to be activated from the 
list of pendingApplications.
I will update a patch with this change.

> pendingApplications in LeafQueue should also use OrderingPolicy
> ---------------------------------------------------------------
>                 Key: YARN-3873
>                 URL: https://issues.apache.org/jira/browse/YARN-3873
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>    Affects Versions: 2.7.0
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: 0001-YARN-3873.patch, 0002-YARN-3873.patch
> Currently *pendingApplications* in LeafQueue is using 
> {{applicationComparator}} from CapacityScheduler. This can be changed and 
> pendingApplications can use the OrderingPolicy configured in Queue level 
> (Fifo/Fair as configured). 

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