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https://issues.apache.org/jira/browse/YARN-8509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16551334#comment-16551334
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Zian Chen commented on YARN-8509:
---------------------------------

Upload first patch for review. [~sunilg],could you help review the patch? Thanks

> 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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