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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2892) Unable to get AMRMToken in unmanaged AM when using a secure cluster
Date Wed, 03 Dec 2014 17:14:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-2892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14233199#comment-14233199
] 

Junping Du commented on YARN-2892:
----------------------------------

+1. Patch looks good. Will commit it shortly.

> 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 "Foo@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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