Naganarasimha G R commented on YARN-3692:

Hi [~rohithsharma], Thanks for the update, overall patch looks fine, i got to 
test it too this time. 
few nits :
# {{Kill application application_1474052822592_0004 received from dr.who 
(auth:SIMPLE)Test Kill 1}} is the diagnostic message which was received, which 
does not seem to be a proper sentence. How about {{Application 
"application_1474052822592_0004" was killed by dr.who with diagnostic message: 
Test Kill 1}}
# check style issue seems to be valid
# CLI support also needs to be given, i am fine with handling in a seperate jira

> 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
>         Attachments: 0001-YARN-3692.patch, 0002-YARN-3692.patch, 
> 0003-YARN-3692.patch, 0004-YARN-3692.patch, 0005-YARN-3692.1.patch, 
> 0005-YARN-3692.patch
> Currently YARN's REST API supports killing an application without setting a 
> diagnostic message. It would be good to provide that support.
> *Use Case*
> Usually this helps in workflow management in a multi-tenant environment when 
> the workflow scheduler (or the hadoop admin) wants to kill a job - and let 
> the user know the reason why the job was killed. Killing the job by setting a 
> diagnostic message is a very good solution for that. Ideally, we can set the 
> diagnostic message on all such interface:
> yarn kill -applicationId ... -diagnosticMessage "some message added by 
> admin/workflow"
> REST API { 'state': 'KILLED', 'diagnosticMessage': 'some message added by 
> admin/workflow'}

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