This section contains the su commands for the system accounts that cannot be modified, and is only required if you are using the Ambari-installed-and-managed MySQL instance for the Hive Metastore. If you choose to use an existing MySQL, PostgreSQL or Oracle database for the Hive Metastore, you do not need to include this sudoer command.

# Ambari Non-Customizable Users
ambari ALL=(ALL) NOPASSWD:SETENV: /bin/su mysql *