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https://issues.apache.org/jira/browse/HADOOP-8852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464235#comment-13464235
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Karthik Kambatla commented on HADOOP-8852:
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By the way, in the little time I worked on Hadoop so far, I noticed several 
cases like this where {{close()}} does not stop _all_ the threads it spawns. I 
feel we should add more structure to ensure we do not miss any of them. 
Thoughts?
                
> DelegationTokenRenewer thread is not stopped when its filesystem is closed
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-8852
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8852
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Tom White
>            Assignee: Karthik Kambatla
>         Attachments: hadoop-8852.patch
>
>
> HftpFileSystem and WebHdfsFileSystem should stop the DelegationTokenRenewer 
> thread when they are closed. 

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