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https://issues.apache.org/jira/browse/YARN-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated YARN-503:
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Attachment: YARN-503.patch
Fixed findbugs issues. Upon review of those issues, I realized I was trying
too hard to prevent tight & unlikely race conditions.
I simplified the design further which allowed for the removal of virtually all
the synchronization which could lead to tricky deadlocks.
Updated tests to ensure apps and/or tokens don't leak.
> 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, 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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