No Move button for Spark2 in Ambari . Why?
If I have to move spark2. I will need to add service to node and then restart the service right?
What happens to the existing spark2-clients in the node. if I try to add another spark2 components?
Not all services in Ambari has move option.
Yes, You can add the Spark2 service in new machine and delete the existing one. After that restart the required components/clients.