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[Sylvain Bauza <1890244@xxxxxxxxxxxxxxxxxx>]

I was able to reproduce this bug.
This is due to the fact we look at the RequestSpec https://github.com/openstack/nova/blob/ebe08834f311e8e22bfd9685d7e6e91dab967382/nova/compute/manager.py#L3657

and then we direcly ask to get the group by the hint there
https://github.com/openstack/nova/blob/ebe08834f311e8e22bfd9685d7e6e91dab967382/nova/compute/manager.py#L1733

Eventually, if the group is deleted, we'll return a
InstanceGroupNotFound exception by
https://github.com/openstack/nova/blob/ebe08834f311e8e22bfd9685d7e6e91dab967382/nova/objects/instance_group.py#L223

** Changed in: nova
       Status: Expired => Triaged

** Changed in: nova
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1890244

Title:
  nova scheduler should ignore removed groups

Status in OpenStack Compute (nova):
  Triaged

Bug description:
  Description
  ===========
  We created a server group and started some instances in it.

  Later we removed the server group.

  Some time later, we had to evacuate these instances, but this failed, because the
  scheduler removed all available hosts during filtering.

  Steps to reproduce
  ==================
  * create a server group
  * start some instances in this group
  * delete the server group
  * ( hard poweroff your hypervisor )
  * evacuate the instances

  Expected result
  ===============
  The instances are evacuated

  Actual result
  =============
  The instances run into ERROR-state, because the server group is not found.

  Environment
  ===========
  * Kolla deployed OpenStack Train
  * Ubuntu 18.04 / KVM + Libvirt

  Logs & Configs
  ==============

  scheduler tells:

   Filtering removed all hosts for the request with instance ID
  'adddf2c9-0252-4463-a97c-f1ec209d9f49'. Filter results:
  ['AvailabilityZoneFilter: (start: 2, end: 2)', 'ComputeFilter: (start:
  2, end: 2)', 'ComputeCapabilitiesFilter: (start: 2, end: 2)',
  'ImagePropertiesFilter: (start: 2, end: 2)',
  'ServerGroupAntiAffinityFilter: (start: 2, end: 2)',
  'ServerGroupAffinityFilter: (start: 2, end: 0)']

  instance show:

   | fault | {'code': 404, 'created': '2020-08-04T06:13:41Z', 'message':
  'Instance group 7e84dc57-de05-4c92-9e3b-6e2d06c1d85b could not be
  found.'} |

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