@Balaji Vemula After changing dfs.permissions.superusergroup in hdfs-site.xml, it would require a NameNode restart for the change to take effect. If this cluster uses NameNode HA with QuorumJournalManager, then both NameNodes need to be restarted. Run "hdfs groups <username>", where <username> is the user that you have added to the group that you want to be the HDFS supergroup. This command will print out a list of that user's group memberships, as perceived by the NameNode. If the list does not show your configured supergroup, then this indicates there is some kind of misconfiguration From the root CLI switch user to user balu # su - balu Now at the prompt you should be able to run hdfs command as user balu $ hdfs dfsadmin -printTopology That should work even on your cloudera ... View more

Thank you for your support ... View more

Thank you!   kerberos configured successfully  bue when i am trying to execute commands, i was not able work wiht my cluster as i am getting below error please help     [hdfs@cn1 ~]$ hdfs dfsadmin -safemode get 18/03/31 09:16:48 WARN security.UserGroupInformation: PriviledgedActionException as:hdfs (auth:KERBEROS) cause:javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)] 18/03/31 09:16:48 WARN ipc.Client: Exception encountered while connecting to the server : javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)] 18/03/31 09:16:48 WARN security.UserGroupInformation: PriviledgedActionException as:hdfs (auth:KERBEROS) cause:java.io.IOException: javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)] safemode: Failed on local exception: java.io.IOException: javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]; Host Details : local host is: "cn1.hadoop.com/192.168.56.121"; destination host is: "cn1.hadoop.com":8020;             Thanks Balaji Vemula ... View more