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https://issues.apache.org/jira/browse/YARN-2131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056942#comment-14056942
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Karthik Kambatla commented on YARN-2131:
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bq. the patch is done in a way by instantiating a new ResourceManager
We followed the HDFS NN format implementation. Given NN supports upgrades and 
downgrades, I don't think the way it is currently implemented hinders 
supporting upgrades/downgrades in the future. 

> Add a way to format the RMStateStore
> ------------------------------------
>
>                 Key: YARN-2131
>                 URL: https://issues.apache.org/jira/browse/YARN-2131
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: resourcemanager
>    Affects Versions: 2.4.0
>            Reporter: Karthik Kambatla
>            Assignee: Robert Kanter
>             Fix For: 2.6.0
>
>         Attachments: YARN-2131.patch, YARN-2131.patch
>
>
> There are cases when we don't want to recover past applications, but recover 
> applications going forward. To do this, one has to clear the store. Today, 
> there is no easy way to do this and users should understand how each store 
> works.



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