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[Bug 1988316] [NEW] unshelve to host fails with "Compute host could not be found" even when the compute exists

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Balazs Gibizer <1988316@xxxxxxxxxxxxxxxxxx>
Date: Wed, 31 Aug 2022 14:41:40 -0000
Reply-to: Bug 1988316 <1988316@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

We observed that the recently merged test_unshelve_to_specific_host[id-b5cc0889-50c2-46a0-b8ff-b5fb4c3a6e20] tempest test case 100% fails in the nova-multi-cell job with:
Details: {'code': 400, 'message': 'Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.'}[1]

Even thought the requested host do exists, up and enabled.

The problem appears to be that the compute.api.API.unshelve() code,
running the compute-api service tries to queries the Cell DB to check
the provided hostname without targeting the context to the proper Cell
DB [2].


Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi Traceback (most recent call last):
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/compute/shelve.py", line 124, in _unshelve
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     self.compute_api.unshelve(
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 388, in inner
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return function(self, context, instance, *args, **kwargs)
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 241, in inner
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return function(self, context, instance, *args, **kwargs)
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 167, in inner
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(self, context, instance, *args, **kw)
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 4577, in unshelve
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     objects.ComputeNode.get_first_node_by_host_for_old_compat(
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/usr/local/lib/python3.8/dist-packages/oslo_versionedobjects/base.py", line 184, in wrapper
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     result = fn(cls, context, *args, **kwargs)
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/objects/compute_node.py", line 293, in get_first_node_by_host_for_old_compat
Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     computes = ComputeNodeList.get_all_by_host(context, host, use_slave)
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/usr/local/lib/python3.8/dist-packages/oslo_versionedobjects/base.py", line 184, in wrapper
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     result = fn(cls, context, *args, **kwargs)
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/objects/compute_node.py", line 476, in get_all_by_host
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     db_computes = cls._db_compute_node_get_all_by_host(context, host,
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/db/main/api.py", line 179, in wrapper
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(*args, **kwargs)
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/objects/compute_node.py", line 472, in _db_compute_node_get_all_by_host
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return db.compute_node_get_all_by_host(context, host)
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/db/main/api.py", line 241, in wrapper
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(context, *args, **kwargs)
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/db/main/api.py", line 740, in compute_node_get_all_by_host
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     raise exception.ComputeHostNotFound(host=host)
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi nova.exception.ComputeHostNotFound: Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi During handling of the above exception, another exception occurred:
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi Traceback (most recent call last):
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 539, in _process_stack
Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     action_result = self.dispatch(meth, request, action_args)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 630, in dispatch
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return method(req=request, **action_args)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 664, in wrapped
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(*args, **kwargs)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/validation/__init__.py", line 110, in wrapper
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/validation/__init__.py", line 110, in wrapper
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/compute/shelve.py", line 144, in _unshelve
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     raise exc.HTTPBadRequest(explanation=e.format_message())
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi webob.exc.HTTPBadRequest: Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi During handling of the above exception, another exception occurred:
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi Traceback (most recent call last):
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 539, in _process_stack
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     action_result = self.dispatch(meth, request, action_args)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 372, in __exit__
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     raise Fault(ex_value)
Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi nova.api.openstack.wsgi.Fault: Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.

[1] https://de836787b7e59a5adc13-298f4365cc798f0001a632f171eb41d6.ssl.cf2.rackcdn.com/831219/22/check/nova-multi-cell/9d8aa66/controller/logs/screen-n-api.txt
[2] https://github.com/openstack/nova/blob/733a87e6126e4da8261eada74ba2cd0ec55f8a72/nova/compute/api.py#L4577

** Affects: nova
     Importance: Critical
         Status: Confirmed


** Tags: api cells gate-failure shelve

** Summary changed:

- unshelve to host fails with Compute host could not be found even when the compute exists
+ unshelve to host fails with "Compute host could not be found" even when the compute exists

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

** Tags added: gate-failure

-- 
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https://bugs.launchpad.net/bugs/1988316

Title:
  unshelve to host fails with "Compute host could not be found" even
  when the compute exists

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  We observed that the recently merged test_unshelve_to_specific_host[id-b5cc0889-50c2-46a0-b8ff-b5fb4c3a6e20] tempest test case 100% fails in the nova-multi-cell job with:
  Details: {'code': 400, 'message': 'Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.'}[1]

  Even thought the requested host do exists, up and enabled.

  The problem appears to be that the compute.api.API.unshelve() code,
  running the compute-api service tries to queries the Cell DB to check
  the provided hostname without targeting the context to the proper Cell
  DB [2].

  
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi Traceback (most recent call last):
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/compute/shelve.py", line 124, in _unshelve
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     self.compute_api.unshelve(
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 388, in inner
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return function(self, context, instance, *args, **kwargs)
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 241, in inner
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return function(self, context, instance, *args, **kwargs)
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 167, in inner
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(self, context, instance, *args, **kw)
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/compute/api.py", line 4577, in unshelve
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     objects.ComputeNode.get_first_node_by_host_for_old_compat(
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/usr/local/lib/python3.8/dist-packages/oslo_versionedobjects/base.py", line 184, in wrapper
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     result = fn(cls, context, *args, **kwargs)
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/objects/compute_node.py", line 293, in get_first_node_by_host_for_old_compat
  Aug 31 12:35:18.468701 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     computes = ComputeNodeList.get_all_by_host(context, host, use_slave)
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/usr/local/lib/python3.8/dist-packages/oslo_versionedobjects/base.py", line 184, in wrapper
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     result = fn(cls, context, *args, **kwargs)
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/objects/compute_node.py", line 476, in get_all_by_host
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     db_computes = cls._db_compute_node_get_all_by_host(context, host,
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/db/main/api.py", line 179, in wrapper
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(*args, **kwargs)
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/objects/compute_node.py", line 472, in _db_compute_node_get_all_by_host
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return db.compute_node_get_all_by_host(context, host)
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/db/main/api.py", line 241, in wrapper
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(context, *args, **kwargs)
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/db/main/api.py", line 740, in compute_node_get_all_by_host
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     raise exception.ComputeHostNotFound(host=host)
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi nova.exception.ComputeHostNotFound: Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi During handling of the above exception, another exception occurred:
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi Traceback (most recent call last):
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 539, in _process_stack
  Aug 31 12:35:18.470614 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     action_result = self.dispatch(meth, request, action_args)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 630, in dispatch
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return method(req=request, **action_args)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 664, in wrapped
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return f(*args, **kwargs)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/validation/__init__.py", line 110, in wrapper
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/validation/__init__.py", line 110, in wrapper
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/compute/shelve.py", line 144, in _unshelve
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     raise exc.HTTPBadRequest(explanation=e.format_message())
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi webob.exc.HTTPBadRequest: Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi During handling of the above exception, another exception occurred:
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi 
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi Traceback (most recent call last):
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 539, in _process_stack
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     action_result = self.dispatch(meth, request, action_args)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi   File "/opt/stack/nova/nova/api/openstack/wsgi.py", line 372, in __exit__
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi     raise Fault(ex_value)
  Aug 31 12:35:18.472497 ubuntu-focal-rax-dfw-0030919238 devstack@n-api.service[98054]: ERROR nova.api.openstack.wsgi nova.api.openstack.wsgi.Fault: Compute host ubuntu-focal-rax-dfw-0030919238 could not be found.

  [1] https://de836787b7e59a5adc13-298f4365cc798f0001a632f171eb41d6.ssl.cf2.rackcdn.com/831219/22/check/nova-multi-cell/9d8aa66/controller/logs/screen-n-api.txt
  [2] https://github.com/openstack/nova/blob/733a87e6126e4da8261eada74ba2cd0ec55f8a72/nova/compute/api.py#L4577

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