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[Takashi Kajinami <1709594@xxxxxxxxxxxxxxxxxx>]

The blueprint mentioned above was completed so I assume this was already
fixed.

** Changed in: nova
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1709594

Title:
  xen: live-migration without '--block-migrate" failed with "No
  sql_connection parameter is established" (cells v2 aggregate up-call
  in superconductor mode)

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  The test in on XenServer.
  nova  live-migration <VM>

  If we run the live-migration without the option of "--block-migrate", it will failed with error as:
     RemoteError: Remote error: RemoteError Remote error: CantStartEngineError No sql_connection parameter is established"

  - The trace for nova-conductor:
  Aug 09 10:12:55 DevStackOSDomU nova-conductor[13365]: line 990, in wrapper\\n    with self._transaction_scope(context):\\n\', u\'  
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__\\n    return self.gen.next()\\n\', u\'  
  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 1040, in _transaction_scope\\n    context=context) as resource:\\n\', u\'  
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__\\n    return self.gen.next()\\n\', u\' 
   File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 645, in _session\\n    bind=self.connection, mode=self.mode)\\n\', u\'  
  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 402, in _create_session\\n    self._start()\\n\', u\'  
  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 496, in _start\\n    engine_args, maker_args)\\n\', u\'  
  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 518, in _setup_for_connection\\n    "No sql_connection parameter is established")\\n\', u\'CantStartEngineError: No sql_connection parameter is established\\n\'].\n'].

  
  - The trace from nova-compute:
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 211, in decorated_function
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     self.force_reraise()
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 199, in decorated_function
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 5253, in check_can_live_migrate_destination
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     disk_over_commit)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 5264, in _do_check_can_live_migrate_destination
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     block_migration, disk_over_commit)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/xenapi/driver.py", line 465, in check_can_live_migrate_destination
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     disk_over_commit)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 2281, in check_can_live_migrate_destination
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     self._ensure_host_in_aggregate(ctxt, src)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 2203, in _ensure_host_in_aggregate
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     self._get_host_uuid_from_aggregate(context, hostname)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 2189, in _get_host_uuid_from_aggregate
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     aggregate_list = objects.AggregateList.get_by_host(context, CONF.host)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 177, in wrapper
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     args, kwargs)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/conductor/rpcapi.py", line 240, in object_class_action_versions
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     args=args, kwargs=kwargs)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line 169, in call
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     retry=self.retry)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 123, in _send
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     timeout=timeout, retry=retry)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 578, in send
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     retry=retry)
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 569, in _send
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server     raise result
  Aug 09 03:26:17 DevStackOSDomU nova-compute[1762]: ERROR oslo_messaging.rpc.server RemoteError: Remote error: CantStartEngineError No sql_connection parameter is established

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