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https://issues.apache.org/jira/browse/YARN-2919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Naganarasimha G R updated YARN-2919:
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    Attachment: YARN-2919.005.patch

Thanks [~djp] for taking a look at the patch and sorry for the delayed reply.
I checked multiple times these were my findings :
# {{TestRMRestart.testRMRestartWaitForPreviousAMToFinish}} fails always with or 
without patch even after YARN-5416. I have raise YARN- for it.
# {{TestDelegationTokenRenewer}} is same as YARN-5816 tested multiple times in 
the local setup it never fails and had seen some one complaining about the 
failure but was not able to find out the jira. I have raise YARN- for it 
# {{TestRaceWhenRelogin.test}} also passes in my local setup and failure does 
not seem to be related to the patch.

Have uploaded the patch with reworking on your comment. Please check if the log 
message is fine or you were expecting some thing else 

> Potential race between renew and cancel in DelegationTokenRenwer 
> -----------------------------------------------------------------
>
>                 Key: YARN-2919
>                 URL: https://issues.apache.org/jira/browse/YARN-2919
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.6.0
>            Reporter: Karthik Kambatla
>            Assignee: Naganarasimha G R
>            Priority: Critical
>         Attachments: YARN-2919.002.patch, YARN-2919.003.patch, 
> YARN-2919.004.patch, YARN-2919.005.patch, YARN-2919.20141209-1.patch
>
>
> YARN-2874 fixes a deadlock in DelegationTokenRenewer, but there is still a 
> race because of which a renewal in flight isn't interrupted by a cancel. 



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