Comment 1 for bug 1671648

tried on devstack.
nova / nova/conductor/manager.py:schedule_and_build_instances

filter_props = request_spec.to_legacy_filter_properties_dict()
scheduler_utils.populate_filter_properties(filter_props,
                                                       host)

The filter_pros here is an empty dict,so nothing is done in _add_retry_host and the retry feature is broken.

I will investigate this and work on this problem.