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https://issues.apache.org/jira/browse/HDFS-5217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777008#comment-13777008
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Jing Zhao commented on HDFS-5217:
---------------------------------

bq. Reading the patch, it appears that you used BASIC auth to authenticate the 
user.

Yes, actually that's the original behavior. 

bq. http://hadoop.apache.org/docs/stable/HttpAuthentication.html

Thanks for the link! I will follow the instructions and do the test.
                
> Namenode log directory link is inaccessible in secure cluster
> -------------------------------------------------------------
>
>                 Key: HDFS-5217
>                 URL: https://issues.apache.org/jira/browse/HDFS-5217
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5217.000.patch
>
>
> Currently in a secured HDFS cluster, 401 error is returned when clicking the 
> "NameNode Logs" link.
> Looks like the cause of the issue is that the httpServer does not correctly 
> set the security handler and the user realm currently, which causes the 
> httpRequest.getRemoteUser (for the log URL) to return null and later be 
> overwritten to the default web name (e.g., "dr.who") by the filter. In the 
> meanwhile, in a secured cluster the log URL requires the http user to be an 
> administrator. That's why we see the 401 error.

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