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https://issues.apache.org/jira/browse/HDFS-3807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435560#comment-13435560
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Alejandro Abdelnur commented on HDFS-3807:
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If I'm not mistaken this is by design. AFAIK, user filters are meant web ui 
servlets/jsps, ie to add you own authentication mechanism. 
webhdfs/hftp/shuffle/fsimage/... servlets sure sure don't need that.

Said this, the HttpServer setup become a big spaghetti, and it is very 
difficult to figure out, given a servlet/jps, what filters is has. It would be 
nice to have something a bit more declarative where you can see the composition 
of filter(s)/servlets.
                
> hadoop.http.filter.initializers not applied to webhdfs urls
> -----------------------------------------------------------
>
>                 Key: HDFS-3807
>                 URL: https://issues.apache.org/jira/browse/HDFS-3807
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 0.23.3
>            Reporter: Thomas Graves
>
> I was messing with the http filters and noticed that they don't get applied 
> when going to the webhdfs uri's.  This might also apply to the other internal 
> namenode servlets.

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