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https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989225#comment-15989225
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Eric Payne commented on YARN-2113:
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[~sunilg], I'm sorry to say that the latest patch (YARN-2113.0013.patch) makes
things worse for USERLIMIT_FIRST mode. Not only does it allow the ((100/MULP) +
1) user to preempt other users down to 1 container, it also oscillates. In
fact, even in PRIORITY_FIRST mode, it preempts users below their user limit,
even when #users < (100/MULP).
I suggest that we separate the USERLIMIT/PRIORITY_FIRST code into a separate
JIRA. Can you easily revert all USERLIMIT_FIRST/PRIORITY_FIRST changes? I would
suggest using YARN-2113.0012.patch as a basis because YARN-2113.0013.patch has
problems even in the PRIORITY_FIRST 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: 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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