Description of problem:
Newton -> Queens FFU upgrade: fast_forward_upgrade_playbook fails with Error: Evaluation Error: Error while evaluating a Function Call, Could not find data item nova::rabbit_password in any Hiera data file and no default supplied at /root/nova-api_upgrade_manifest.pp:6:18 on node controller-0.localdomain
Checking the overcloud controller it looks that the hierarchy section in /etc/puppet/hiera.yaml doesn't point to any files:
[root@controller-0 ~]# cat /etc/puppet/hiera.yaml
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.