Don't persist RequestSpec.requested_destination
The RequestSpec.requested_destination, similar to the retry field, is per-request/operation, and persisting it can caues issues when subsequent move requests. For example, if you cold migrate a server to a specific host and then live migrate that server without specifying a host, the requested target host from the cold migrate is sent to the scheduler for the live migration, but since that is where the instance is already running, it's rejected with NoValidHost. This is a similar issue to the need to call RequestSpec.reset_forced_destinations() in all move operations in conductor. However, rather than try to whack this mole in every place the request spec is sent to the scheduler, like reset_forced_destinations() is used, we simply don't need to persist the requested_destination field since it's just a vehicle to tell the scheduler which host we want. The related functional regression test is updated to show the bug is now fixed. Conflicts: nova/objects/request_spec.py NOTE(mriedem): The conflict is due to not having change Icb295bbd8c83e2e340a7ac3ecc1f159e0db7c7b1 in Queens. Change-Id: I2a78f0754c63381c57e7e1c610d0938b6df0f537 Closes-Bug: #1797580 (cherry picked from commitce3af5e33a
) (cherry picked from commit954b2004a1
)
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@ -511,9 +511,11 @@ class RequestSpec(base.NovaObject):
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if 'instance_group' in spec and spec.instance_group:
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spec.instance_group.members = None
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spec.instance_group.hosts = None
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# NOTE(mriedem): Don't persist retries since those are per-request
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if 'retry' in spec and spec.retry:
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spec.retry = None
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# NOTE(mriedem): Don't persist retries or requested_destination
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# since those are per-request
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for excluded in ('retry', 'requested_destination'):
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if excluded in spec and getattr(spec, excluded):
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setattr(spec, excluded, None)
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db_updates = {'spec': jsonutils.dumps(spec.obj_to_primitive())}
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if 'instance_uuid' in updates:
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@ -92,8 +92,6 @@ class ColdMigrateTargetHostThenLiveMigrateTest(
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'os-migrateLive': {'host': None, 'block_migration': 'auto'}}
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self.admin_api.post_server_action(server['id'], live_migrate_req)
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server = self._wait_for_state_change(self.admin_api, server, 'ACTIVE')
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# FIXME(mriedem): Until bug 1797580 is resolved the migration will
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# fail during scheduling.
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migration = self._wait_for_migration_status(server, ['error'])
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self.assertEqual('live-migration', migration['migration_type'])
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# The live migration should have been successful and the server is now
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# back on the original host.
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self.assertEqual(original_host, server['OS-EXT-SRV-ATTR:host'])
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@ -543,6 +543,7 @@ class _TestRequestSpecObject(object):
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self.assertIsNone(serialized_obj.instance_group.members)
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self.assertIsNone(serialized_obj.instance_group.hosts)
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self.assertIsNone(serialized_obj.retry)
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self.assertIsNone(serialized_obj.requested_destination)
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def test_create(self):
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req_obj = fake_request_spec.fake_spec_obj(remove_id=True)
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@ -565,6 +566,9 @@ class _TestRequestSpecObject(object):
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def test_save(self):
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req_obj = fake_request_spec.fake_spec_obj()
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# Make sure the requested_destination is not persisted since it is
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# only valid per request/operation.
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req_obj.requested_destination = objects.Destination(host='fake')
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def _test_save_args(self2, context, instance_uuid, changes):
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self._check_update_primitive(req_obj, changes)
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