Lei Guo commented on YARN-2915:

Thanks [~subru] and [~curino], maybe we should also consider the router to be 
per DC.

Another question, for [~curino]'s comment, " the AMRMProxy of YARN-2884 can be 
run only on a small cluster that work as a launch pad for the federation.", can 
you elaborate a little bit on the desired end to end behavior? The description 
in the design is different to the comment, "The AMRMProxy runs on all the NM 
machines and acts as a proxy to the YARN RM for the AMs by implementing the 

> 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
> Yarn_federation_design_v1.pdf, federation-prototype.patch
> 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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