6.Browse the scripts
directory and create the .py command scripts:master.py, slave.py and
sample_client.py under : /var/lib/ambari-server/resources/stacks/HDP/2.4/services/SAMPLESRV/package/scripts
was the issue: in the documentation
it doesn’t mention about the dummy.pid that needs to be created. Since we have not installed a real service, there is no PID file
created by it. Therefore, we are going to artificially create the PID, remove
the PID and check the process status of the dummy pid.
7.Then restart ambari: ambari-server
restart and add the service to the stack as shown the document. Just don't want to duplicate the process with steps here.