I have user LDAP and I want to add my user to new group in HDFS. By default, the group belongs to LDAP user has the same name with the user name itself. Example : my LDAP user is monica.baniwijaya and the user belongs to group monica.baniwijaya. I need to create new group and add my user to the group. I've tried this code below : $ groupadd ARMIS $ useradd –g ARMIS monica.baniwijaya  and then : $ su hdfs $ hdfs dfsadmin -refreshUserToGroupsMappings   In HDFS, my user don't belongs to group ARMIS, but in CentOS, my user belongs to that group. I have read many documentations about creating group in HDFS, and many articles said when I do code above, group will be created on HDFS cluster too. Please help me to resolve this issue.   Note : This is the current HDFS Configuration for hadoop.security.group.mapping :        ... View more