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From "Daryn Sharp (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 Fri, 22 Mar 2013 21:59:16 GMT

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

Daryn Sharp updated YARN-503:
-----------------------------

    Attachment: YARN-503.patch

Overhaul and simplify the RM's token renewer.  Apps now track their tokens, and tokens track
their apps.  The 3 background threads - renewer, canceler, delayed canceler - are consolidated
into a single timer thread.  

Tokens are cancelled after all their active apps have completed, unless an app requested the
token not be cancelled (compatibility), in which case the renewal is simply stopped.  This
solves the multiple timers per token, and persistent renewal issues.

This change should allow the deprecation and removal of support for not canceling tokens.

                
> 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: Bug
>          Components: resourcemanager
>    Affects Versions: 0.23.3, 3.0.0, 2.0.0-alpha
>            Reporter: Siddharth Seth
>            Assignee: Daryn Sharp
>         Attachments: 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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