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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-503) DelegationTokens will be renewed forever if multiple jobs share tokens and the first one sets JOB_CANCEL_DELEGATION_TOKEN to false
Date Mon, 06 May 2013 22:20:16 GMT

     [ https://issues.apache.org/jira/browse/YARN-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated YARN-503:
-----------------------------------------

    Issue Type: Sub-task  (was: Bug)
        Parent: YARN-47
    
> DelegationTokens will be renewed forever if multiple jobs share tokens and the first
one sets JOB_CANCEL_DELEGATION_TOKEN to false
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-503
>                 URL: https://issues.apache.org/jira/browse/YARN-503
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 0.23.3, 3.0.0, 2.0.0-alpha
>            Reporter: Siddharth Seth
>            Assignee: Daryn Sharp
>         Attachments: YARN-503.patch, YARN-503.patch
>
>
> The first Job/App to register a token is the one which DelegationTokenRenewer associates
with a a specific Token. An attempt to remove/cancel these shared tokens by subsequent jobs
doesn't work - since the JobId will not match.
> As a result, Even if subsequent jobs have MRJobConfig.JOB_CANCEL_DELEGATION_TOKEN set
to true - tokens will not be cancelled when those jobs complete.
> Tokens will eventually be removed from the RM / JT when the service that issued them
considers them to have expired or via an explicit cancelDelegationTokens call (not implemented
yet in 23).
> A side affect of this is that the same delegation token will end up being renewed multiple
times (a separate TimerTask for each job which uses the token).
> DelegationTokenRenewer could maintain a reference count/list of jobIds for shared tokens.

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