@shahab nasir Best is to use the ambari-qa user. This is special user with super powers 🙂 su ambari-qa Overall, please understand the Hadoop security model. Spend some time to understand the user permissions. This is mostly like unix. The service accounts hdfs, yarn etc are service accounts that are part of hadoop group. Spend some time on the Hadoop HDFS section. This will help your understanding better. ... View more