roundrobinuserresolver needs to map the users in thetrace to the provided list of target users . so user list is needed . concode_field_sep HashMap<String,UserGroupInformation> usercache concode_elem_sep Log LOG concode_elem_sep int uidx concode_elem_sep List<UserGroupInformation> users concode_field_sep List<UserGroupInformation> parseUserList concode_elem_sep UserGroupInformation getTargetUgi concode_elem_sep boolean setTargetUsers concode_elem_sep String buildEmptyUsersErrorMsg
boolean function ( ) { return true ; }