Jian He commented on YARN-4126:

[~bibindeve...@gmail.com], thanks for working on this !
calling initializeUserGroupSecureMode everywhere in all related test cases does 
not seem like an elegant solution. why is this call needed?
Could you do it in a more clean way?

> RM should not issue delegation tokens in unsecure mode
> ------------------------------------------------------
>                 Key: YARN-4126
>                 URL: https://issues.apache.org/jira/browse/YARN-4126
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Bibin A Chundatt
>         Attachments: 0001-YARN-4126.patch, 0002-YARN-4126.patch, 
> 0003-YARN-4126.patch, 0004-YARN-4126.patch, 0005-YARN-4126.patch
> ClientRMService#getDelegationToken is currently  returning a delegation token 
> in insecure mode. We should not return the token if it's in insecure mode. 

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