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https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16383904#comment-16383904
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Eric Payne commented on YARN-4781:
----------------------------------

My thinking on a solution to this would be to check in 
{{FifoIntraQueuePreemptionPlugin}} whether or not the FairOrderingPolicy is 
enabled on the queue being processed. In {{createTempAppForResCalculation}} and 
{{calculateToBePreemptedResourcePerApp}}, if the FairOrderingPolicy is enabled 
for the queue, use a different comparator (other than {{TAPriorityComparator}}) 
that has the following algorithm:

I have a patch coded up if you would be interested.

{code:title=TAFairOrderingComparator}
    if ((total resources used by user of app1) == (total resources used by user 
of app2))  {
        return appID1 - appID2
    }
    if ((total resources used by user of app1) < (total resources used by user 
of app2)) {
        return -1
    } else {
        return 1
    }
{code}


I have a patch coded up if you would be interested.

> Support intra-queue preemption for fairness ordering policy.
> ------------------------------------------------------------
>
>                 Key: YARN-4781
>                 URL: https://issues.apache.org/jira/browse/YARN-4781
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>            Priority: Major
>
> We introduced fairness queue policy since YARN-3319, which will let large 
> applications make progresses and not starve small applications. However, if a 
> large application takes the queue’s resources, and containers of the large 
> app has long lifespan, small applications could still wait for resources for 
> long time and SLAs cannot be guaranteed.
> Instead of wait for application release resources on their own, we need to 
> preempt resources of queue with fairness policy enabled.



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