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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984231#comment-15984231
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Sunil G commented on YARN-2113:
-------------------------------
Thanks [~eepayne] for the comment. I almost understood this case.
{code:title=LeafQueue#canAssignToUser}
// Note: We aren't considering the current request since there is a fixed
// overhead of the AM, but it's a > check, not a >= check, so...
if (Resources.greaterThan(resourceCalculator, clusterResource,
user.getUsed(nodePartition), limit)) {
....
....
{code}
As per this code, scheduler will push one more container over its limit. So we
can consider this also. i will update a patch. Thanks once again for getting
this corner case.
> 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:
> 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.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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