you said "I just installed HDP 3.1.0 via Ambari as barebones "
do you means that you installed the HDP version VIA the ambari?
I installed the ambari server on master1 machine , and I have also worker01/02/03 machines
from this point what is the best way to install only the HDFS?
note - we want to automate the installation by Blue print , so no manual steps should be from the ambari GUI