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https://issues.apache.org/jira/browse/YARN-1724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13903769#comment-13903769
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Karthik Kambatla commented on YARN-1724:
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Sorting here helps with balancing load better between nodes. Given not all
containers run for the same duration, round-robin alone wouldn't lead to
balanced load.
> Race condition in Fair Scheduler when continuous scheduling is turned on
> -------------------------------------------------------------------------
>
> Key: YARN-1724
> URL: https://issues.apache.org/jira/browse/YARN-1724
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Attachments: YARN-1724-1.patch, YARN-1724.patch
>
>
> If nodes resource allocations change during
> Collections.sort(nodeIdList, nodeAvailableResourceComparator);
> we'll hit:
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
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