[Bug 1793353] Re: broken upgrade path q->r requirement for oslo.db

[Matt Riedemann]

This was already fixed in nova, I need to duplicate the bug for that.

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Title:
  broken upgrade path q->r requirement for oslo.db

Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive rocky series:
  Fix Committed
Status in OpenStack Compute (nova):
  Fix Released
Status in nova package in Ubuntu:
  Fix Released
Status in nova source package in Cosmic:
  Fix Released

Bug description:
  Nova is using async_ introduced in oslo.db 4.40.0 but requirements.txt says oslo.db>=4.27.0
  https://github.com/openstack/oslo.db/commit/df6bf3401266f42271627c1e408f87c71a06cef7

  So if you still have an old oslo.db version from queens that satisfies
  that requirement services will fail with below:

  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service Traceback (most recent call last):
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 729, in run_service
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     service.start()
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/service.py", line 180, in start
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     self.manager.pre_start_hook()
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1249, in pre_start_hook
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     startup=True)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 7757, in update_available_resource
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     startup=startup)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 7788, in _get_compute_nodes_in_db
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     use_slave=use_slave)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 177, in wrapper
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     args, kwargs)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/conductor/rpcapi.py", line 241, in object_class_action_versions
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     args=args, kwargs=kwargs)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 179, in call
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     retry=self.retry)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 133, in _send
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     retry=retry)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 584, in send
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     call_monitor_timeout, retry=retry)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 575, in _send
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     raise result
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service AttributeError: '_TransactionContextManager' object has no attribute 'async_'
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service Traceback (most recent call last):
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service 
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 126, in _object_dispatch
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     return getattr(target, method)(*args, **kwargs)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service 
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 184, in wrapper
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     result = fn(cls, context, *args, **kwargs)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service 
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/objects/compute_node.py", line 437, in get_all_by_host
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     use_slave=use_slave)
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service 
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service   File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py", line 205, in wrapper
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service     reader_mode = get_context_manager(context).async_
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service 
  2018-09-19 16:56:35.965 136178 ERROR oslo_service.service AttributeError: '_TransactionContextManager' object has no attribute 'async_'

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