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https://issues.apache.org/jira/browse/HDFS-4548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596509#comment-13596509
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Daryn Sharp commented on HDFS-4548:
-----------------------------------

Valid points.  Currently webhdfs does both spnego and token auth for all 
non-token operations.  Maybe what I should do is make the authenticated url 
stuff only be used by token operations.  All other operations do not require 
spnego, they just need a token.  The token ops don't send data payloads, so the 
retry-ability of those operations when the spnego token goes bad is not an 
issue.
                
> 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.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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