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https://issues.apache.org/jira/browse/YARN-2008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081718#comment-14081718
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Wangda Tan commented on YARN-2008:
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Hi [~cwelch],
I found the patch you updated is identical with *.3.patch, could you please 
check?

Thanks

> CapacityScheduler may report incorrect queueMaxCap if there is hierarchy 
> queue structure 
> -----------------------------------------------------------------------------------------
>
>                 Key: YARN-2008
>                 URL: https://issues.apache.org/jira/browse/YARN-2008
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.3.0
>            Reporter: Chen He
>            Assignee: Craig Welch
>         Attachments: YARN-2008.1.patch, YARN-2008.2.patch, YARN-2008.3.patch, 
> YARN-2008.4.patch
>
>
> If there are two queues, both allowed to use 100% of the actual resources in 
> the cluster. Q1 and Q2 currently use 50% of actual cluster's resources and 
> there is not actual space available. If we use current method to get 
> headroom, CapacityScheduler thinks there are still available resources for 
> users in Q1 but they have been used by Q2. 
> If the CapacityScheduelr has a hierarchy queue structure, it may report 
> incorrect queueMaxCap. Here is a example
>                              ||                    ||rootQueue||     ||
> |  |                               /                               |          
>           \                     |
> |      L1ParentQueue1                      |          |            
> L1ParentQueue2    |
> |  (allowed to use up 80% of its parent)    |  |         (allowed to use 20% 
> in minimum of its parent)|
> |                    /   |     \ |                            |  
> |  L2LeafQueue1 |    L2LeafQueue2 |  |     
> |(50% of its parent) |  (50% of its parent in minimum) |   |
> When we calculate headroom of a user in L2LeafQueue2, current method will 
> think L2LeafQueue2 can use 40% (80%*50%) of actual rootQueue resources. 
> However, without checking L1ParentQueue1, we are not sure. It is possible 
> that L1ParentQueue2 have used 40% of rootQueue resources right now. Actually, 
> L2LeafQueue2 can only use 30% (60%*50%). 



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