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https://issues.apache.org/jira/browse/HDFS-15021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16984716#comment-16984716
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Yuxuan Wang commented on HDFS-15021:
------------------------------------

I think TestZKDelegationTokenSecretManager#testNodesLoadedAfterRestart() 
already cover the case.

> RBF:  Delegation Token can't remove correctly in absence of cancelToken and 
> restart the router.
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-15021
>                 URL: https://issues.apache.org/jira/browse/HDFS-15021
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Weidong Duan
>            Priority: Major
>
> The ZKDelegationTokenSecretManager couldn't remove the expired DTs on the 
> Zookeeper as expected when restart the Router in the absence of invoking the 
> method ` ZKDelegationTokenSecretManager#cancelToken`.
> This case will cause many stale DTs leave on the Zookeeper . Maybe cause the 
> performance problem of the Router.
> I think this is a bug and  should be resolved in the latter. Is it Right?



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