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[OpenStack Infra <1869050@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/714998
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=738110db7492b1360f5f197e8ecafd69a3b141b4
Submitter: Zuul
Branch:    master

commit 738110db7492b1360f5f197e8ecafd69a3b141b4
Author: Balazs Gibizer <balazs.gibizer@xxxxxxxx>
Date:   Wed Mar 25 17:48:23 2020 +0100

    Update scheduler instance info at confirm resize
    
    When a resize is confirmed the instance does not belong to the source
    compute any more. In the past the scheduler instance info is only
    updated by the _sync_scheduler_instance_info periodic. This caused that
    server boots with anti-affinity did not consider the source host.
    But now at the end of the confirm_resize call the compute also updates
    the scheduler about the move.
    
    Change-Id: Ic50e72e289b56ac54720ad0b719ceeb32487b8c8
    Closes-Bug: #1869050


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1869050

Title:
  migration of anti-affinity server fails due to stale scheduler
  instance info

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) pike series:
  Triaged
Status in OpenStack Compute (nova) queens series:
  Triaged
Status in OpenStack Compute (nova) rocky series:
  Triaged
Status in OpenStack Compute (nova) stein series:
  Triaged
Status in OpenStack Compute (nova) train series:
  Triaged

Bug description:
  Description
  ===========

  
  Steps to reproduce
  ==================
  Have a deployment with 3 compute nodes

  * make sure that the deployment is configured with tracks_instance_changes=True (True is the default)
  * create and server group with anti-affinity policy
  * boot server1 into the group
  * boot server2 into the group
  * migrate server2
  * confirm the migration
  * boot server3

  Make sure that between the last two steps there was no periodic
  _sync_scheduler_instance_info running on the compute that was hosted
  server2 before the migration. This could done by doing the last too
  steps after each other without waiting too much as interval of that
  periodic (scheduler_instance_sync_interval) is defaulted to 120 sec.

  Expected result
  ===============
  server3 is booted on the host where server2 is moved away

  Actual result
  =============
  server3 cannot be booted (NoValidHost)

  Triage
  ======

  The confirm resize call on the source compute does not update the
  scheduler that the instance is removed from this host. This makes the
  scheduler instance info stale and causing the subsequent scheduling
  error.

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