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From "Omkar Vinit Joshi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-897) CapacityScheduler wrongly sorted queues
Date Thu, 11 Jul 2013 23:59:48 GMT

    [ https://issues.apache.org/jira/browse/YARN-897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706488#comment-13706488
] 

Omkar Vinit Joshi commented on YARN-897:
----------------------------------------

[~dedcode] please do keep older patches... it helps reviewing by sometimes diffing against
older patches and verifying older comments... Thanks
                
> CapacityScheduler wrongly sorted queues
> ---------------------------------------
>
>                 Key: YARN-897
>                 URL: https://issues.apache.org/jira/browse/YARN-897
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>            Reporter: Djellel Eddine Difallah
>         Attachments: TestBugParentQueue.java, YARN-897-2.patch
>
>
> The childQueues of a ParentQueue are stored in a TreeSet where UsedCapacity defines the
sort order. This ensures the queue with least UsedCapacity to receive resources next. On containerAssignment
we correctly update the order, but we miss to do so on container completions. This corrupts
the TreeSet structure, and under-capacity queues might starve for resources.

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