Wangda Tan commented on YARN-3410:

bq. Yes, in the same user two RM can not be started. It check for PID and fail 
it. YARN-2268 disallows the formatting state store while RM is running. The 
same verification can be made for this also in that JIRA
Yes we should, it's the same problem.

The latest patch LGTM, +1.

> YARN admin should be able to remove individual application records from 
> RMStateStore
> ------------------------------------------------------------------------------------
>                 Key: YARN-3410
>                 URL: https://issues.apache.org/jira/browse/YARN-3410
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager, yarn
>            Reporter: Wangda Tan
>            Assignee: Rohith
>            Priority: Critical
>         Attachments: 0001-YARN-3410-v1.patch, 0001-YARN-3410.patch, 
> 0001-YARN-3410.patch, 0002-YARN-3410.patch, 0003-YARN-3410.patch, 
> 0004-YARN-3410.patch
> When RM state store entered an unexpected state, one example is YARN-2340, 
> when an attempt is not in final state but app already completed, RM can never 
> get up unless format RMStateStore.
> I think we should support remove individual application records from 
> RMStateStore to unblock RM admin make choice of either waiting for a fix or 
> format state store.
> In addition, RM should be able to report all fatal errors (which will 
> shutdown RM) when doing app recovery, this can save admin some time to remove 
> apps in bad state.

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