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Setting HDFS extended file attributes "hadoop fs -setfattr" permission denied for mapr group user

Question asked by reedv on May 1, 2018
Latest reply on May 1, 2018 by keysbotzum

Trying to set some extended file attributes for a file in the MFS with the command

hadoop fs -setfattr -n trusted.myattr -v 'my attribute' /hdfs/path/to/file 

as documented here (Apache Hadoop 3.1.0 – Extended Attributes in HDFS ). This works when I am the mapr user, but when I am any other user, I cannot see anything when using 

hadoop fs -getattr -d /hdfs/path/to/file

and attempting to set extended attributes in the trusted namespace raises permission denied errors (even when the user is part of the mapr group). Note that the permissions for this file are set to 1775. What exactly is meant in the documentation in "The trusted namespace is available only to HDFS superusers." (ie. what is being considered as a superuser)? Does anyone know why this is happening and what can be done to work around / fix this (ie. be able to access the trusted namespace without having the mapr uid (but having the mapr gid))? Thanks.