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https://issues.apache.org/jira/browse/HDFS-7295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185503#comment-14185503
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Allen Wittenauer commented on HDFS-7295:
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What [~ste...@apache.org] said.  The fact that YARN doesn't appear to have a 
configurable upper limit is a security hole to me.

> Support arbitrary max expiration times for delegation token
> -----------------------------------------------------------
>
>                 Key: HDFS-7295
>                 URL: https://issues.apache.org/jira/browse/HDFS-7295
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Anubhav Dhoot
>
> Currently the max lifetime of HDFS delegation tokens is hardcoded to 7 days. 
> This is a problem for different users of HDFS such as long running YARN apps. 
> Users should be allowed to optionally specify max lifetime for their tokens.



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