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https://issues.apache.org/jira/browse/YARN-897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706109#comment-13706109
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Omkar Vinit Joshi commented on YARN-897:
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[~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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