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https://issues.apache.org/jira/browse/HDFS-13972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16652817#comment-16652817
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Íñigo Goiri commented on HDFS-13972:
------------------------------------

For HDFS-12512, we had to do HDFS-12945.
In HDFS-12945, we switched the extraction of the ClientProtocol from the 
Namenode and then HDFS-12512 was able to reimplement {{getRpcClientProtocol()}} 
to inspect the Router instead of the Namenode.
I think the approach should be similar: we refactor the JspHelper to have a 
method that checks the Namenode but then we subclass it (or similar) so we can 
have a version that gets a Router.
I'm not very familiar with the JspHelper but I'm guessing we can make a 
{{RouterJspHelper}} or similar which extends the {{JspHelper}}.
Anyway, in general, we should refactor either the {{NamenodeWebHdfsMethods}} or 
the {{JspHelper}} so we can tune it for the Router.
We can do the refactor in trunk.


> RBF: Support for Delegation Token (WebHDFS)
> -------------------------------------------
>
>                 Key: HDFS-13972
>                 URL: https://issues.apache.org/jira/browse/HDFS-13972
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: CR Hota
>            Priority: Major
>
> HDFS Router should support issuing HDFS delegation tokens through WebHDFS.



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