[Bug 1890244] Re: nova scheduler should ignore removed groups

[Edward Hope-Morley]

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/victoria
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/yoga
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/xena
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/wallaby
   Importance: Undecided
       Status: New

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

Title:
  nova scheduler should ignore removed groups

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive victoria series:
  New
Status in Ubuntu Cloud Archive wallaby series:
  New
Status in Ubuntu Cloud Archive xena series:
  New
Status in Ubuntu Cloud Archive yoga series:
  In Progress
Status in OpenStack Compute (nova):
  Fix Released

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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