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https://issues.apache.org/jira/browse/HDFS-14545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856272#comment-16856272
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Ayush Saxena commented on HDFS-14545:
-------------------------------------

Yes, that seems correct, the both of these should be align.

I just have a  concern that nobody comes up in future telling, the namenode 
return these groups, but through router the response is different.

Well if this isn't expected to happen or can rarely occur. I am fine with 
Router responding.

Which way you prefer? Just a minor dilemma, Obvious when you have choices. I am 
almost OK with both.

> RBF: Router should support GetUserMappingsProtocol
> --------------------------------------------------
>
>                 Key: HDFS-14545
>                 URL: https://issues.apache.org/jira/browse/HDFS-14545
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Priority: Major
>         Attachments: HDFS-14545-HDFS-13891-01.patch, 
> HDFS-14545-HDFS-13891.000.patch
>
>
> We should be able to check the groups for a user from a Router.



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