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Posted to yarn-issues@hadoop.apache.org by "Djellel Eddine Difallah (JIRA)" <ji...@apache.org> on 2013/07/03 19:30:24 UTC

[jira] [Updated] (YARN-897) CapacityScheduler wrongly sorted queues

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

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

    Attachment: TestBugParentQueue.java

Simple JUnit Test that triggers the bug.
                
> 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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