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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995184#comment-15995184
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Eric Payne commented on YARN-2113:
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[~sunilg], would you mind, please, explaining why the check for
{{usedMinusOneContainer > userLimit}} is necessary? If this code will skip if
{{(used - currentContainer) > userLimit}}, why is it also necessary to check
{{usedMinusOneContainer > userLimit}}? Won't that check happen when the
youngest container _is_ the current container?
{code:title=FifoIntraQueuePreemptionPlugin#skipContainerBasedOnIntraQueuePolicy}
return Resources.lessThanOrEqual(rc, clusterResource,
Resources.subtract(usedResource, c.getAllocatedResource()), userLimit)
&& Resources.greaterThan(rc, clusterResource, usedMinusOneContainer,
userLimit)
&& context.getIntraQueuePreemptionOrder()
.equals(IntraQueuePreemptionOrder.USERLIMIT_FIRST);
}
{code}
> Add cross-user preemption within CapacityScheduler's leaf-queue
> ---------------------------------------------------------------
>
> Key: YARN-2113
> URL: https://issues.apache.org/jira/browse/YARN-2113
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: scheduler
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Sunil G
> Attachments: IntraQueue Preemption-Impact Analysis.pdf,
> TestNoIntraQueuePreemptionIfBelowUserLimitAndDifferentPrioritiesWithExtraUsers.txt,
> YARN-2113.0001.patch, YARN-2113.0002.patch, YARN-2113.0003.patch,
> YARN-2113.0004.patch, YARN-2113.0005.patch, YARN-2113.0006.patch,
> YARN-2113.0007.patch, YARN-2113.0008.patch, YARN-2113.0009.patch,
> YARN-2113.0010.patch, YARN-2113.0011.patch, YARN-2113.0012.patch,
> YARN-2113.0013.patch, YARN-2113.apply.onto.0012.ericp.patch,
> YARN-2113.v0.patch
>
>
> Preemption today only works across queues and moves around resources across
> queues per demand and usage. We should also have user-level preemption within
> a queue, to balance capacity across users in a predictable manner.
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