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

[OpenStack Infra]

Reviewed:  https://review.opendev.org/c/openstack/nova/+/867989
Committed: https://opendev.org/openstack/nova/commit/7934b9ec57d7060fbcf27706aa98ebf5a83f920a
Submitter: "Zuul (22348)"
Branch:    stable/yoga

commit 7934b9ec57d7060fbcf27706aa98ebf5a83f920a
Author: Sean Mooney <work at seanmooney.info>
Date:   Tue Jun 21 12:23:45 2022 +0100

    ignore deleted server groups in validation
    
    This change simply catches the exception raised when
    we lookup a servergroup via a hint and the validation
    upcall is enabled.
    
    Change-Id: I858b4da35382a9f4dcf88f4b6db340e1f34eb82d
    Closes-Bug: #1890244
    (cherry picked from commit cd2c2f359bbd4913cfe73199847bc35b2664aaa9)


** Changed in: cloud-archive/yoga
       Status: In Progress => Fix Committed

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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:
  Fix Committed
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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