Rohith commented on YARN-2268:

Thinking on this jira, getting many questions. 
# How to identify RM is running since RM can be formated from anywhere in the 
# In HA, for each rm-ids to be checked for serviceState. This would result in 
time consuming for each hosts retry would take time. If switch happens in the 
middle while checking rm-ids, it would give wrong result that all RM's are in 

I think if admin support is there, 1st can be solved easily.

> Disallow formatting the RMStateStore when there is an RM running
> ----------------------------------------------------------------
>                 Key: YARN-2268
>                 URL: https://issues.apache.org/jira/browse/YARN-2268
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Karthik Kambatla
>            Assignee: Rohith
> YARN-2131 adds a way to format the RMStateStore. However, it can be a problem 
> if we format the store while an RM is actively using it. It would be nice to 
> fail the format if there is an RM running and using this store. 

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