I don’t think you can do this, because Hadoop doesn’t manage user groups. 
Itself needs to be configured into a user group mapping provider backed by your 
provided identity backends. If not provided, it uses shell login user and group 
in your Linux systems. With the user-group mapping provider, it can only 
determine the user’s groups given a user name. Again, it doesn’t be able to 
fetch all groups existing in your system or identity backend. Hope this helps.


From: Shashi Vishwakarma [mailto:shashi.vish...@gmail.com]
Sent: Thursday, September 22, 2016 5:05 PM
To: user.hadoop <user@hadoop.apache.org>
Subject: Get All Hadoop Groups


I am looking for a way to fetch all hadoop groups available on cluster.

Is there any way to do this using Java?


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