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https://issues.apache.org/jira/browse/HADOOP-9049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500310#comment-13500310
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Daryn Sharp commented on HADOOP-9049:
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+1 But I'd suggest canceling the token in {{removeRenewAction}}. Hftp &
webhdfs only register tokens for renewal that are implicitly created for
internal use. Since they aren't cancelled, it causes a bunch of defunct tokens
to clog the NN until they expire. If you want to fix it on another jira, I'm
fine with that.
> DelegationTokenRenewer needs to be Singleton and FileSystems should
> register/deregister to/from.
> ------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9049
> URL: https://issues.apache.org/jira/browse/HADOOP-9049
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.0.2-alpha
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Attachments: hadoop-9049.patch, hadoop-9049.patch
>
>
> Currently, DelegationTokenRenewer is not singleton.
> Each filesystem using it spawns its own DelegationTokenRenewer. Also, they
> don't stop the Renewer leading to other problems.
> A single DelegationTokenRenewer should be sufficient for all FileSystems.
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