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https://issues.apache.org/jira/browse/YARN-897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706152#comment-13706152
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Carlo Curino commented on YARN-897:
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I agree this need fixing soon. We have a first draft of the patch, we were
planning to test it out carefully before posting it, but if you have cycles we
can socialize it right-away and we can work on it together.
[~dedcode] please post the patch in its current state. [~ojoshi] you can check
it out and we can test/verify in the meantime.
> 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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