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https://issues.apache.org/jira/browse/YARN-2892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238137#comment-14238137
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Rohith commented on YARN-2892:
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bq. the applicationReport return to client include short name now rather than 
full name before.
I did not get where exactly breaking compatibility.. Before patch also, 
application report sends short name instead of full name. Am I missing anything?

> Unable to get AMRMToken in unmanaged AM when using a secure cluster
> -------------------------------------------------------------------
>
>                 Key: YARN-2892
>                 URL: https://issues.apache.org/jira/browse/YARN-2892
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Sevada Abraamyan
>            Assignee: Sevada Abraamyan
>         Attachments: YARN-2892.patch, YARN-2892.patch, YARN-2892.patch
>
>
> An AMRMToken is retrieved from the ApplicationReport by the YarnClient. 
> When the RM creates the ApplicationReport and sends it back to the client it 
> makes a simple security check whether it should include the AMRMToken in the 
> report (See createAndGetApplicationReport in RMAppImpl).This security check 
> verifies that the user who submitted the original application is the same 
> user who is requesting the ApplicationReport. If they are indeed the same 
> user then it includes the AMRMToken, otherwise it does not include it.
> The problem arises from the fact that when an application is submitted, the 
> RM  saves the short username of the user who created the application (See 
> submitApplication in ClientRmService). Afterwards when the ApplicationReport 
> is requested, the system tries to match the full username of the requester 
> against the previously stored short username. 
> In a secure cluster using Kerberos this check fails because the principle is 
> stripped from the username when we request a short username. So for example 
> the short username might be "Foo" whereas the full username is 
> "f...@company.com"
> Note: A very similar problem has been previously reported 
> ([Yarn-2232|https://issues.apache.org/jira/browse/YARN-2232])



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