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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 18:58:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706109#comment-13706109
] 

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

[~dedcode] / [~curino] you want to work on the patch or can I take over? seems like an important
bug which needs to be fixed. I looked at the code and on container completion it is not resorting
the TreeSet which will result into unfairness..
                
> 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
>
>
> 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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