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https://issues.apache.org/jira/browse/YARN-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613321#comment-13613321
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Alejandro Abdelnur commented on YARN-503:
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bq. Oozie should be unaffected because as long as the launcher job or any child
job is running the tokens will remain valid. Alejandro Abdelnur, can you
confirm?
In the case of Oozie MR actions, the launcher job ends as soon as the MR job is
started, then Oozie tracks the real MR job.
For all other actions (pig, hive, sqoop, distcp, java, shell) the launcher job
blocks (because of the corresponding Main class) until the child/ren job/s end.
Will the case of MR actions be an issue? that the launcher goes away?
> 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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