Comment 19 for bug 1341420

There was a spec proposed and accepted for Liberty that aims at fixing or at least mostly mittigating the described issues

http://specs.openstack.org/openstack/nova-specs/specs/liberty/approved/host-state-level-locking.html

However it did not make it for Liberty - I plan to re-propose for M, and it would be great to get feedback from Ironic folks of course!