Vinod Kumar Vavilapalli reopened YARN-2131:

Reopening for the addendum..

One other thing that occurred to me was running RM while the format is in 
progress or vice-versa. Namenode solves this issue by a lock file. We can do 
the same here.

Irrespective of the approach, I think handling the above is a major blocker for 
this feature/patch. Let's try to do that here too..

> 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, 
> YARN-2131_addendum.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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