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[Bug 1736946] Re: Conductor: fails to clean up networking resources due to _destroy_build_request CantStartEngineError

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** Changed in: nova/newton
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1736946

Title:
  Conductor: fails to clean up networking resources due to
  _destroy_build_request CantStartEngineError

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) newton series:
  Won't Fix
Status in OpenStack Compute (nova) ocata series:
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  If libvirt fails to deploy instance - for example due to problematic
  vif type being passed. The conductor will fail to clean up resources.
  This fails with the exception below. This is due to the fact that the
  cell mapping was not invoked.

  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00mTraceback (most recent call last):
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    res = self.dispatcher.dispatch(message)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 220, in dispatch
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    return self._do_dispatch(endpoint, method, ctxt, args)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 190, in _do_dispatch
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    result = func(ctxt, **new_args)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/opt/stack/nova/nova/conductor/manager.py", line 559, in build_instances
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    self._destroy_build_request(context, instance)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/opt/stack/nova/nova/conductor/manager.py", line 477, in _destroy_build_request
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    context, instance.uuid)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 184, in wrapper
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    result = fn(cls, context, *args, **kwargs)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/opt/stack/nova/nova/objects/build_request.py", line 176, in get_by_instance_uuid
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    db_req = cls._get_by_instance_uuid_from_db(context, instance_uuid)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 983, in wrapper
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    with self._transaction_scope(context):
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    return self.gen.next()
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 1033, in _transaction_scope
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    context=context) as resource:
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    return self.gen.next()
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 638, in _session
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    bind=self.connection, mode=self.mode)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 403, in _create_session
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    self._start()
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 489, in _start
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    engine_args, maker_args)
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/sqlalchemy/enginefacade.py", line 511, in _setup_for_connection
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m    "No sql_connection parameter is established")
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00mCantStartEngineError: No sql_connection parameter is established
  Dec  7 09:12:50 utu1604template nova-conductor[22761]: ERROR oslo_messaging.rpc.server #033[01;35m#033[00m

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