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https://issues.apache.org/jira/browse/HDFS-4548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593759#comment-13593759
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Daryn Sharp commented on HDFS-4548:
-----------------------------------

I generally agree, but given how the code is written I don't think that's 
easily possible.  Webhdfs is managing the token and the token is considered 
immutable once set, so there isn't a way for {{AuthenticatedURL}} to update the 
token...  I'm trying to shoot for the minimal change to make webhdfs usable by 
daemons.  I'm still trying to test this. :/
                
> Webhdfs doesn't renegotiate SPNEGO token
> ----------------------------------------
>
>                 Key: HDFS-4548
>                 URL: https://issues.apache.org/jira/browse/HDFS-4548
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha, 3.0.0, 0.23.7
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-4548.branch-23.patch, HDFS-4548.patch, 
> HDFS-4548.patch
>
>
> When the webhdfs SPNEGO token expires, the fs doesn't attempt to renegotiate 
> a new SPNEGO token.  This renders webhdfs unusable for daemons that are 
> logged in via a keytab which would allow a new SPNEGO token to be generated.

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