Hello! DISCLAIMER: I don't have this knowledge, but want to add my two cents First, I don't think is really necessary. When you delete a service via UI, it automatically refresh and the service dissapears, therefore, by using the REST API, should trigger the same mechanism (if not, I feel is bad design). Second: Ambari Server is independent from HDP. What I mean is: Ambari is used for monitoring/installing/configuring/etc, but it doesnt affect on your cluster. You can power off you Ambari, and your cluster is going to work without problems, therefore, I think restarting or not, is transparent (besides triggering alarms and loading (a tiny bit the system on restart)). My question here is why do you need to use the REST api to delete a service. I mean, a service is normally a "once in a lifetime, besides updates". Why not use GUI, and simplify your life? ... View more

I will strongly suggest to reinstall the OS. They extra time you will spend (few hours max) is not worth it the thousand hours you will spend debuging in future. You will never be able to isolate or asses that the previous installation is not affecting you. Unless your case is very particular (e.g. You really DO NOT have access to the machine, etc... ), reinstall the OS and give yourself peace of mind. Nice guide though @Geoffrey Shelton Okot ... View more