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https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389649#comment-16389649
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Eric Payne commented on YARN-4781:
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Thanks a lot for the review [~sunilg].
{quote} my concern is over case where we need to worry about priority with
FairOrdering. Both are kind of mutually exclusive feature to me.
we need to ensure that FairOrdering + USERLIMIT_FIRST is the combination
{quote}
It appears that the capacity scheduler's FairOrderingPolicy ignores priority.
That is why I did not consider it in the {{TAFairOrderingComparator.}} Having
said that, I am fine with adding an additional check to ensure that
USERLIMIT_FIRST is set before setting the {{TAFairOrderingComparator}}
{quote}could we use Fair plugin instead of FifoIntraQueuePreemptionPlugin, and
make an abstract class to move all common code. Then Fair plugin could be auto
chosen based on ordering policy selected
{quote}
I feel that this would add unnecessary complexity. I think restricting the
changes to the comparator is a cleaner approach.
> 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
> Attachments: YARN-4781.001.patch
>
>
> 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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