Is it possible to run ansible playbook, which looks like this (it is an example from this site: http://docs.ansible.com/playbooks_roles.html):
- name: this i
Check out this POC or MVP of running in parallel one-host-from-every-group (for all hosts) https://github.com/sirkubax/szkolenie3/tree/master/playbooks/playgroups
you may get the inspiration