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https://issues.apache.org/jira/browse/YARN-7496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16257384#comment-16257384
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Wangda Tan commented on YARN-7496:
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[~eepayne], thanks for filing the JIRA and working on the fix, change makes
sense to me.
> CS Intra-queue preemption user-limit calculations are not in line with
> LeafQueue user-limit calculations
> --------------------------------------------------------------------------------------------------------
>
> Key: YARN-7496
> URL: https://issues.apache.org/jira/browse/YARN-7496
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.8.2
> Reporter: Eric Payne
> Assignee: Eric Payne
> Attachments: YARN-7496.001.branch-2.8.patch
>
>
> Only a problem in 2.8.
> Preemption could oscillate due to the difference in how user limit is
> calculated between 2.8 and later releases.
> Basically (ignoring ULF, MULP, and maybe others), the calculation for user
> limit on the Capacity Scheduler side in 2.8 is {{total used resources /
> number of active users}} while the calculation in later releases is {{total
> active resources / number of active users}}. When intra-queue preemption was
> backported to 2.8, it's calculations for user limit were more aligned with
> the latter algorithm, which is in 2.9 and later releases.
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