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https://issues.apache.org/jira/browse/YARN-335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza updated YARN-335:
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Attachment: YARN-335.patch
> Fair scheduler doesn't check whether rack needs containers before assigning
> to node
> -----------------------------------------------------------------------------------
>
> Key: YARN-335
> URL: https://issues.apache.org/jira/browse/YARN-335
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 2.0.2-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Attachments: YARN-335.patch
>
>
> If an application has an outstanding request on a node, the fair scheduler
> may try to place a container on that node without checking whether that
> node's rack needs any containers. If the rack doesn't need any containers,
> none should be scheduled on the node.
> This can cause an NPE in the fair scheduler.
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