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https://issues.apache.org/jira/browse/YARN-149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13715622#comment-13715622
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Karthik Kambatla commented on YARN-149:
---------------------------------------

Bikas - I believe the following lines do mention it, but not as explicitly as 
your comment. Might help to be more explicit.

External RPC services accept client requests for the active RM instance and 
reject client requests for the standby RM. It is expected that the standby RM 
will receive no external stimulus and hence there will be no internal activity 
*(services etc.)* on the standby RM.
                
> ResourceManager (RM) High-Availability (HA)
> -------------------------------------------
>
>                 Key: YARN-149
>                 URL: https://issues.apache.org/jira/browse/YARN-149
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Harsh J
>            Assignee: Bikas Saha
>         Attachments: rm-ha-phase1-approach-draft1.pdf, 
> rm-ha-phase1-draft2.pdf, YARN ResourceManager Automatic 
> Failover-rev-07-21-13.pdf
>
>
> This jira tracks work needed to be done to support one RM instance failing 
> over to another RM instance so that we can have RM HA. Work includes leader 
> election, transfer of control to leader and client re-direction to new leader.

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