Question-41: If user is created in LDAP, then Ambari Administrator can delete that user?

Answer: No, only user created in local database of the Ambari can be deleted.

Question-42: If I am an Ambari administrator, can I remove that role myself?

Answer:  No, this is not possible. Only another Ambari administrator can do that. So that you cannot accidently remove your own admin role. In the system at least one admin always remains.

Question-43: Ambari administrator can change the password for the user which is in LDAP?

Answer: No, you have to ask LDAP administrator to the same.

Question-44: When you create a new user, is it possible to create a new directory for that user in HDFS file system?

Answer: Yes, that is possible and for that you have to enable the automated creation of directory when a new user is created.

Question-45: Why do you want user directory to be created in HDFS filesystem?

Answer: This is a very common requirement that if you want to run a Hadoop components then unique user should be exists under the HDFS home directory. (Same thing we are doing , which practicing HDPCD Hadoop and Spark certification preparation). And for that you can automate the process in Ambari so that when new component is installed automated user would be created for that. So whenever a component is installed a post user creation script would be executed to create the user.