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https://issues.apache.org/jira/browse/HDFS-15021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985918#comment-16985918
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Weidong Duan commented on HDFS-15021:
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[~John Smith] Got it ! Thank you for your reply.
> 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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