Fix incomplete instance data returned after build failure
This change fixes a race in _cleanup_build_artifacts. We were updating the instance mapping to point at the cell in which the instance was created before the instance record was complete, i.e. before the related BDMs and tags were created in the cell DB. Updating the instance mapping exposes the cell's version of the instance to the API. If the API happened to fetch it before it was finished being created it would return incomplete data. Co-Authored-By: Matt Riedemann <mriedem.os@gmail.com> Closes-Bug: #1820337 Change-Id: If966eb1161c842ff49aa530e4482dbca87b61a3e
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@ -1514,13 +1514,6 @@ class ComputeTaskManager(base.Base):
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'build_instances', updates, exc,
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request_spec)
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# TODO(mnaser): The cell mapping should already be populated by
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# this point to avoid setting it below here.
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inst_mapping = objects.InstanceMapping.get_by_instance_uuid(
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context, instance.uuid)
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inst_mapping.cell_mapping = cell
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inst_mapping.save()
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# In order to properly clean-up volumes when deleting a server in
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# ERROR status with no host, we need to store BDMs in the same
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# cell.
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@ -1536,6 +1529,18 @@ class ComputeTaskManager(base.Base):
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with nova_context.target_cell(context, cell) as cctxt:
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self._create_tags(cctxt, instance.uuid, tags)
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# NOTE(mdbooth): To avoid an incomplete instance record being
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# returned by the API, the instance mapping must be
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# created after the instance record is complete in
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# the cell, and before the build request is
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# destroyed.
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# TODO(mnaser): The cell mapping should already be populated by
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# this point to avoid setting it below here.
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inst_mapping = objects.InstanceMapping.get_by_instance_uuid(
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context, instance.uuid)
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inst_mapping.cell_mapping = cell
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inst_mapping.save()
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# Be paranoid about artifacts being deleted underneath us.
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try:
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build_request.destroy()
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@ -2179,6 +2179,60 @@ class ConductorTaskTestCase(_BaseTaskTestCase, test_compute.BaseTestCase):
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self.params['request_specs'][0].requested_resources = []
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self._do_schedule_and_build_instances_test(self.params)
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@mock.patch('nova.objects.InstanceMapping.get_by_instance_uuid')
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def test_cleanup_build_artifacts(self, inst_map_get):
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"""Simple test to ensure the order of operations in the cleanup method
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is enforced.
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"""
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req_spec = fake_request_spec.fake_spec_obj()
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build_req = fake_build_request.fake_req_obj(self.context)
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instance = build_req.instance
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bdms = objects.BlockDeviceMappingList(objects=[
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objects.BlockDeviceMapping(instance_uuid=instance.uuid)])
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tags = objects.TagList(objects=[objects.Tag(tag='test')])
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cell1 = self.cell_mappings['cell1']
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cell_mapping_cache = {instance.uuid: cell1}
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err = exc.TooManyInstances('test')
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# We need to assert that BDMs and tags are created in the cell DB
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# before the instance mapping is updated.
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def fake_create_block_device_mapping(*args, **kwargs):
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inst_map_get.return_value.save.assert_not_called()
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def fake_create_tags(*args, **kwargs):
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inst_map_get.return_value.save.assert_not_called()
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with test.nested(
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mock.patch.object(self.conductor_manager,
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'_set_vm_state_and_notify'),
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mock.patch.object(self.conductor_manager,
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'_create_block_device_mapping',
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side_effect=fake_create_block_device_mapping),
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mock.patch.object(self.conductor_manager, '_create_tags',
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side_effect=fake_create_tags),
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mock.patch.object(build_req, 'destroy'),
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mock.patch.object(req_spec, 'destroy'),
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) as (
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_set_vm_state_and_notify, _create_block_device_mapping,
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_create_tags, build_req_destroy, req_spec_destroy,
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):
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self.conductor_manager._cleanup_build_artifacts(
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self.context, err, [instance], [build_req], [req_spec], bdms,
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tags, cell_mapping_cache)
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# Assert the various mock calls.
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_set_vm_state_and_notify.assert_called_once_with(
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test.MatchType(context.RequestContext), instance.uuid,
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'build_instances',
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{'vm_state': vm_states.ERROR, 'task_state': None}, err, req_spec)
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_create_block_device_mapping.assert_called_once_with(
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cell1, instance.flavor, instance.uuid, bdms)
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_create_tags.assert_called_once_with(
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test.MatchType(context.RequestContext), instance.uuid, tags)
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inst_map_get.return_value.save.assert_called_once_with()
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self.assertEqual(cell1, inst_map_get.return_value.cell_mapping)
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build_req_destroy.assert_called_once_with()
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req_spec_destroy.assert_called_once_with()
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@mock.patch('nova.objects.CellMapping.get_by_uuid')
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def test_bury_in_cell0_no_cell0(self, mock_cm_get):
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mock_cm_get.side_effect = exc.CellMappingNotFound(uuid='0')
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