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https://issues.apache.org/jira/browse/HDFS-4009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498281#comment-13498281
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Suresh Srinivas commented on HDFS-4009:
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Given this jira has lot of discussion related to what the current title
suggests, lets close this as Invalid and open a new jira with the current patch.
> WebHdfsFileSystem and HftpFileSystem don't need delegation tokens
> -----------------------------------------------------------------
>
> Key: HDFS-4009
> URL: https://issues.apache.org/jira/browse/HDFS-4009
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.0.0-alpha
> Reporter: Tom White
> Assignee: Karthik Kambatla
> Attachments: hadoop-8852.patch, hadoop-8852.patch,
> hadoop-8852-v1.patch, hdfs-4009-v1.patch, hdfs-4009-v2.patch,
> hdfs-4009-v3.patch
>
>
> Parent JIRA to track the work of removing delegation tokens from these
> filesystems.
> This JIRA has evolved from the initial issue of these filesystems not
> stopping the DelegationTokenRenewer thread they were creating.
> After further investigation, Daryn pointed out - "If you can get a token, you
> don't need a token"! Hence, these filesystems shouldn't use delegation tokens.
> Evolution of the JIRA is listed below:
> Update 2:
> DelegationTokenRenewer is not required. The filesystems that are using it
> already have Krb tickets and do not need tokens. Remove
> DelegationTokenRenewer and all the related logic from WebHdfs and Hftp
> filesystems.
> Update1:
> DelegationTokenRenewer should be Singleton - the instance and renewer threads
> should be created/started lazily. The filesystems using the renewer shouldn't
> need to explicity start/stop the renewer, and only register/de-register for
> token renewal.
> Initial issue:
> HftpFileSystem and WebHdfsFileSystem should stop the DelegationTokenRenewer
> thread when they are closed.
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