Rohith Sharma K S commented on YARN-3692:

Going through for the implementation, this JIRA required to be handleid from 
{{REST}} and {{YarnClient}}. For both, common change is KillApplicationRequest 
proto i.e adding {{user diagnostic message}}. After making required 
modifications to protos 
# REST service API can be mofied without breaking compatibility by adding new 
field in AppState.
# {{YarnClient#killApplication(ApplicationId applicationId)}} modifying this 
signature would be compatibile issue since it is already exposed API. 
I would like to hear comments from community about compatibility problem. 

> Allow REST API to set a user generated message when killing an application
> --------------------------------------------------------------------------
>                 Key: YARN-3692
>                 URL: https://issues.apache.org/jira/browse/YARN-3692
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Rajat Jain
>            Assignee: Rohith Sharma K S
> Currently YARN's REST API supports killing an application without setting a 
> diagnostic message. It would be good to provide that support.

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