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[Bug 1693600] [NEW] Boot from volume fails when cross_az_attach=False due to: ObjectActionError: Object action obj_load_attr failed because: attribute host not lazy-loadable

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Public bug reported:

Reproduced here:

http://logs.openstack.org/74/467674/2/check/gate-tempest-dsvm-neutron-
full-ubuntu-
xenial/414bb96/logs/screen-n-api.txt.gz?level=TRACE#_May_25_02_46_02_139728

May 25 02:46:02.139728 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api [req-4a040119-d445-4eb8-8d56-a29653bb6866 tempest-TestVolumeBootPattern-1408924396 tempest-TestVolumeBootPattern-1408924396] Failed BDM validation for volume: 4eb7a1cf-1f6d-4b7c-ae37-99688a0c1e6d
May 25 02:46:02.140058 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api Traceback (most recent call last):
May 25 02:46:02.140638 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/compute/api.py", line 1412, in _validate_bdm
May 25 02:46:02.140851 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     context, volume_id, instance)
May 25 02:46:02.141057 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/compute/api.py", line 3711, in _check_attach_and_reserve_volume
May 25 02:46:02.141281 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     instance=instance)
May 25 02:46:02.141487 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/volume/cinder.py", line 285, in check_availability_zone
May 25 02:46:02.141700 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     instance_az = az.get_instance_availability_zone(context, instance)
May 25 02:46:02.141997 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/availability_zones.py", line 167, in get_instance_availability_zone
May 25 02:46:02.142308 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     host = instance.get('host')
May 25 02:46:02.142540 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 771, in get
May 25 02:46:02.142762 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     return getattr(self, key)
May 25 02:46:02.142978 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 67, in getter
May 25 02:46:02.143196 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     self.obj_load_attr(name)
May 25 02:46:02.143414 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/objects/instance.py", line 1029, in obj_load_attr
May 25 02:46:02.143636 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     reason='attribute %s not lazy-loadable' % attrname)
May 25 02:46:02.144016 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api ObjectActionError: Object action obj_load_attr failed because: attribute host not lazy-loadable
May 25 02:46:02.144244 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api 

This is because the instance object here is not created from the
database, it's created in the API code to be set in the BuildRequest
object, and it doesn't have the host field set:

https://github.com/openstack/nova/blob/4b732b5b3e7c1da63fa20af52028e7903986ba6a/nova/compute/api.py#L1023

So we need to handle the fact that 'host' might not be set in the
instance object in this code.

** Affects: nova
     Importance: High
     Assignee: Matt Riedemann (mriedem)
         Status: Triaged

** Affects: nova/ocata
     Importance: High
         Status: Triaged


** Tags: api availability-zones

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Changed in: nova/ocata
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1693600

Title:
  Boot from volume fails when cross_az_attach=False due to:
  ObjectActionError: Object action obj_load_attr failed because:
  attribute host not lazy-loadable

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) ocata series:
  Triaged

Bug description:
  Reproduced here:

  http://logs.openstack.org/74/467674/2/check/gate-tempest-dsvm-neutron-
  full-ubuntu-
  xenial/414bb96/logs/screen-n-api.txt.gz?level=TRACE#_May_25_02_46_02_139728

  May 25 02:46:02.139728 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api [req-4a040119-d445-4eb8-8d56-a29653bb6866 tempest-TestVolumeBootPattern-1408924396 tempest-TestVolumeBootPattern-1408924396] Failed BDM validation for volume: 4eb7a1cf-1f6d-4b7c-ae37-99688a0c1e6d
  May 25 02:46:02.140058 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api Traceback (most recent call last):
  May 25 02:46:02.140638 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/compute/api.py", line 1412, in _validate_bdm
  May 25 02:46:02.140851 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     context, volume_id, instance)
  May 25 02:46:02.141057 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/compute/api.py", line 3711, in _check_attach_and_reserve_volume
  May 25 02:46:02.141281 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     instance=instance)
  May 25 02:46:02.141487 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/volume/cinder.py", line 285, in check_availability_zone
  May 25 02:46:02.141700 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     instance_az = az.get_instance_availability_zone(context, instance)
  May 25 02:46:02.141997 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/availability_zones.py", line 167, in get_instance_availability_zone
  May 25 02:46:02.142308 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     host = instance.get('host')
  May 25 02:46:02.142540 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 771, in get
  May 25 02:46:02.142762 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     return getattr(self, key)
  May 25 02:46:02.142978 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 67, in getter
  May 25 02:46:02.143196 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     self.obj_load_attr(name)
  May 25 02:46:02.143414 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api   File "/opt/stack/new/nova/nova/objects/instance.py", line 1029, in obj_load_attr
  May 25 02:46:02.143636 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api     reason='attribute %s not lazy-loadable' % attrname)
  May 25 02:46:02.144016 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api ObjectActionError: Object action obj_load_attr failed because: attribute host not lazy-loadable
  May 25 02:46:02.144244 ubuntu-xenial-infracloud-vanilla-8978830 nova-api[17948]: ERROR nova.compute.api 

  This is because the instance object here is not created from the
  database, it's created in the API code to be set in the BuildRequest
  object, and it doesn't have the host field set:

  https://github.com/openstack/nova/blob/4b732b5b3e7c1da63fa20af52028e7903986ba6a/nova/compute/api.py#L1023

  So we need to handle the fact that 'host' might not be set in the
  instance object in this code.

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