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From "Djellel Eddine Difallah (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-897) CapacityScheduler wrongly sorted queues
Date Fri, 12 Jul 2013 00:01:49 GMT

     [ https://issues.apache.org/jira/browse/YARN-897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Djellel Eddine Difallah updated YARN-897:
-----------------------------------------

    Attachment: YARN-897-1.patch
    
> 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-897-1.patch, 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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