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https://issues.apache.org/jira/browse/HADOOP-13582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15478312#comment-15478312
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Xiao Chen commented on HADOOP-13582:
------------------------------------

No tests added since this is a logging improvement.
Failed test looks unrelated and passed locally.

> Implement logExpireToken in ZKDelegationTokenSecretManager
> ----------------------------------------------------------
>
>                 Key: HADOOP-13582
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13582
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: kms
>    Affects Versions: 2.8.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>            Priority: Minor
>              Labels: supportability
>         Attachments: HADOOP-13582.01.patch
>
>
> During my investigation on HADOOP-13487, I found it pretty difficult to track 
> KMS DTs in ZK, even in debug level.
> Adding a simple debug log to make future triages easier.



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