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https://issues.apache.org/jira/browse/YARN-2915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14231897#comment-14231897
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Chen He commented on YARN-2915:
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Hi [~subru], this is an interesting idea. It may make the task-scheduling 
across data centers possible. Look forward to see more details. 

> Enable YARN RM scale out via federation using multiple RM's
> -----------------------------------------------------------
>
>                 Key: YARN-2915
>                 URL: https://issues.apache.org/jira/browse/YARN-2915
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: nodemanager, resourcemanager
>            Reporter: Sriram Rao
>            Assignee: Subru Krishnan
>
> This is an umbrella JIRA that proposes to scale out YARN to support large 
> clusters comprising of tens of thousands of nodes.   That is, rather than 
> limiting a YARN managed cluster to about 4k in size, the proposal is to 
> enable the YARN managed cluster to be elastically scalable.  



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