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https://issues.apache.org/jira/browse/YARN-9768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16958032#comment-16958032
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Manikandan R commented on YARN-9768:
------------------------------------

Sorry for the delay. Attached .004.patch.

[~inigoiri] Addressed all of your comments.

[~bibinchundatt] Introduced {{DelegationTokenRenewerPoolTracker}} runnable 
class to process all futures in a separate thread.

> RM Renew Delegation token thread should timeout and retry
> ---------------------------------------------------------
>
>                 Key: YARN-9768
>                 URL: https://issues.apache.org/jira/browse/YARN-9768
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: CR Hota
>            Priority: Major
>         Attachments: YARN-9768.001.patch, YARN-9768.002.patch, 
> YARN-9768.003.patch
>
>
> Delegation token renewer thread in RM (DelegationTokenRenewer.java) renews 
> HDFS tokens received to check for validity and expiration time.
> This call is made to an underlying HDFS NN or Router Node (which has exact 
> APIs as HDFS NN). If one of the nodes is bad and the renew call is stuck the 
> thread remains stuck indefinitely. The thread should ideally timeout the 
> renewToken and retry from the client's perspective.
>  



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