Hi all, I tried to upgrade nova-compute from stein -> train release and “openstack-nova-compute” couldn’t able to start and from log here is coming up ################### 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service Traceback (most recent call last): 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 810, in run_service 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service service.start() 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/nova/service.py", line 174, in start 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service self.manager.init_host() 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1337, in init_host 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service expected_attrs=['info_cache', 'metadata', 'numa_topology']) 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 177, in wrapper 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service args, kwargs) 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/nova/conductor/rpcapi.py", line 241, in object_class_action_versions 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service args=args, kwargs=kwargs) 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 181, in call 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service transport_options=self.transport_options) 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 129, in _send 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service transport_options=transport_options) 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 646, in send 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service transport_options=transport_options) 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 636, in _send 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service raise result 2020-06-18 11:31:08.037 303344 ERROR oslo_service.service RemoteError: Remote error: DBError (pymysql.err.InternalError) (1054, u"Unknown column 'instances.hidden' in 'field list ……. ################### I only took beginning part, the field doesn’t exist in DB, or? I also upgrade rest of the nova components[api-scheduler-conductor,…] but that didn’t go away. Any idea how to tackle this?