@Sunile Manjee As @SBandaru states, you will need to make sure that proper group membership is maintained for the non-standard users. If you specify the users at cluster creation time, Ambari will take care of this for you. If you create them after the fact, then you will need to verify group membership. You may also need to modify the auth_to_local filters if the non-standard users are in AD/LDAP and you need to map them to local users. Another thing to consider is if you run the Ambari agent as non-root. There are a number of sudo rules that need to be put in place for the ambari user that allow execution of commands as the various service accounts for purposes of starting/stopping the services, installing packages, etc. You'll need to modify the customizable users sudo entry to suit your environment.
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