Nova Instance creation is failing with request_spec.instance_group appears to be None

[M V P Nitesh]

I'm trying to create a magnum cluster on Devstack(both Queens and master). Cluster creation is failing.

Nova Instance is going to error state with the below error:

{"message": "'NoneType' object has no attribute 'hosts'", "code": 500, "details": " File
\"/opt/stack/nova/nova/conductor/manager.py\", line 585, in build_instances
     instance_uuids,
 return_alternates=True)
   File \"/opt/stack/nova/nova/conductor/manager.py\", line 720, in
 _schedule_instances
     scheduler_utils.setup_instance_group(context, request_spec)
   File
 \"/opt/stack/nova/nova/scheduler/utils.py\", line 836, in setup_instance_group

 request_spec.instance_group.hosts = list(group_info.hosts)
 ", "created": "2018-08-10T08:32:01Z"}

Getting this error http://paste.openstack.org/show/727798/ in nova-cell-region and http://paste.openstack.org/show/727799/ in nova-cell-child

[Sylvain Bauza (sylvain-bauza)]

As per https://docs.openstack.org/nova/latest/user/cells.html#status the current status for Cells V1 is *DEPRECATED*.
As you can see above, only regressions that aren't due to Cells V1 will be fixed, but this specific bug doesn't meet the criterias. As moving from Cells v1 to v2 or not using Cells means that the problem doesn't exist implies that there will be no resolution.

Closing the bug accordingly.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Lee Yarwood (<email address hidden>) on branch: master
Review: https://review.openstack.org/590733