Cloudera Sentry with LDAP - Unable to add user as Sentry admin
You need to use the Unix group to which the Unix-User you are using belongs. Sentry can only use the Unix group, which in the case of Hive, Hue and Impala in the default configuration is hive, hue and impala.
Sentry cannot use LDAP groups. You need to use Unix groups in the setting sentry.service.admin.group.