Naganarasimha G R updated YARN-2919:
    Attachment: YARN-2919.20141209-1.patch

Hi [~kasha] & [~seth.siddha...@gmail.com]
Based on my understanding from the comments, i have uploaded the initial patch 
please review and confirm whether is this the approach you guys had in mind.

> 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-2919.20141209-1.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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