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https://issues.apache.org/jira/browse/YARN-3453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621919#comment-14621919
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Peng Zhang commented on YARN-3453:
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Yes, I agree with more fix in separate JIRA. And {{YARN-3453.5.patch}} LGTM.

> Fair Scheduler : Parts of preemption logic uses DefaultResourceCalculator 
> even in DRF mode causing thrashing
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3453
>                 URL: https://issues.apache.org/jira/browse/YARN-3453
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.6.0
>            Reporter: Ashwin Shankar
>            Assignee: Arun Suresh
>         Attachments: YARN-3453.1.patch, YARN-3453.2.patch, YARN-3453.3.patch, 
> YARN-3453.4.patch, YARN-3453.5.patch
>
>
> There are two places in preemption code flow where DefaultResourceCalculator 
> is used, even in DRF mode.
> Which basically results in more resources getting preempted than needed, and 
> those extra preempted containers aren’t even getting to the “starved” queue 
> since scheduling logic is based on DRF's Calculator.
> Following are the two places :
> 1. {code:title=FSLeafQueue.java|borderStyle=solid}
> private boolean isStarved(Resource share)
> {code}
> A queue shouldn’t be marked as “starved” if the dominant resource usage
> is >=  fair/minshare.
> 2. {code:title=FairScheduler.java|borderStyle=solid}
> protected Resource resToPreempt(FSLeafQueue sched, long curTime)
> {code}
> --------------------------------------------------------------
> One more thing that I believe needs to change in DRF mode is : during a 
> preemption round,if preempting a few containers results in satisfying needs 
> of a resource type, then we should exit that preemption round, since the 
> containers that we just preempted should bring the dominant resource usage to 
> min/fair share.



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