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https://issues.apache.org/jira/browse/YARN-8509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558882#comment-16558882
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Zian Chen commented on YARN-8509:
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talked with [~sunilg], It can go beyond maxCap - usedCap. Because a user can
ask for 10000maps. but cluster can run a max of 1000. In this case, as soon as
each map finish, other one pending will get scheduled
> Fix UserLimit calculation for preemption to balance scenario after queue
> satisfied
> ------------------------------------------------------------------------------------
>
> Key: YARN-8509
> URL: https://issues.apache.org/jira/browse/YARN-8509
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Reporter: Zian Chen
> Assignee: Zian Chen
> Priority: Major
> Attachments: YARN-8509.001.patch
>
>
> In LeafQueue#getTotalPendingResourcesConsideringUserLimit, we calculate total
> pending resource based on user-limit percent and user-limit factor which will
> cap pending resource for each user to the minimum of user-limit pending and
> actual pending. This will prevent queue from taking more pending resource to
> achieve queue balance after all queue satisfied with its ideal allocation.
>
> We need to change the logic to let queue pending can reach at most
> (Queue_max_capacity - Queue_used_capacity).
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