get_instance_bdms tries to access db from compute

[Andrew Laski]

check_can_live_migrate_source() in compute manager calls is_volume_backed_instance() in the compute api which calls get_instance_bdms() which tries to access the database. The offending call is self.db.block_device_mapping_get_all_by_instance(). This needs to be added to the conductor.

[Armando Migliaccio (armando-migliaccio)]

Mate,

is the issue xenserver specific?

[Mate Lakat (mate-lakat)]

Hi Amando, you are right. looking at the logs, it seems, that it is not a xenserver/xenapi specific problem.

Let me include the stactrace from n-cpu screen:

Traceback (most recent call last):
  File "/opt/stack/nova/nova/openstack/common/rpc/amqp.py", line 276, in _process_data
    rval = self.proxy.dispatch(ctxt, version, method, **args)
  File "/opt/stack/nova/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch
    return getattr(proxyobj, method)(ctxt, **kwargs)
  File "/opt/stack/nova/nova/exception.py", line 109, in wrapped
    temp_level, payload)
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
    return f(self, context, *args, **kw)
  File "/opt/stack/nova/nova/compute/manager.py", line 2734, in check_can_live_migrate_source
    None)
  File "/opt/stack/nova/nova/compute/api.py", line 2355, in is_volume_backed_instance
    bdms = bdms or self.get_instance_bdms(context, instance)
  File "/opt/stack/nova/nova/compute/api.py", line 2352, in get_instance_bdms
    instance['uuid'])
  File "/opt/stack/nova/nova/db/api.py", line 1084, in block_device_mapping_get_all_by_instance
    instance_uuid)
  File "/opt/stack/nova/bin/nova-compute", line 67, in __call__
    raise exception.DBNotAllowed('nova-compute')
DBNotAllowed: nova-compute

[Andrew Laski (alaski)]

Duplicate of https://bugs.launchpad.net/nova/+bug/1124594 which is in progress.