Hi all -

I’m hoping to gain some better understanding of the error I’m receiving after a 
minor Havana upgrade.

I recently updated the first of my Centos 6.5 compute nodes from the original 
Havana release to the first Havana maintenance release.   After upgrading this 
node, I attempted to migrate VM’s back onto it and received the following:

2014-02-05 16:10:59.797 3165 ERROR nova.openstack.common.rpc.common 
[req-789d265a-fdc0-43ca-83e8-42a0d4ebac20 04ad0b8d54e946ef93716a92a7159da9 
d746aba61ba143af9971534792657e19] Returning exception Version 1.9 of Instance 
is not supported
Traceback (most recent call last):

 File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/amqp.py", 
line 461, in _process_data
   **args)

 File 
"/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/dispatcher.py", 
line 171, in dispatch
   kwargs = self._deserialize_args(ctxt, kwargs)

 File 
"/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/dispatcher.py", 
line 126, in _deserialize_args
   arg)

 File "/usr/lib/python2.6/site-packages/nova/objects/base.py", line 539, in 
deserialize_entity
   entity = NovaObject.obj_from_primitive(entity, context=context)

 File "/usr/lib/python2.6/site-packages/nova/objects/base.py", line 259, in 
obj_from_primitive
   objclass = cls.obj_class_from_name(objname, objver)

 File "/usr/lib/python2.6/site-packages/nova/objects/base.py", line 230, in 
obj_class_from_name
   objver=objver)

IncompatibleObjectVersion: Version 1.9 of Instance is not supported
to caller


I have not upgraded my controller nodes yet because I would like to better 
understand what is happening here.  Is this being caused because the newer 
version of nova-compute no longer accepts requests from the (older) openstack 
software on the controller?  Is this expected behavior, and I should go ahead 
and upgrade the controller?  What does Version 1.9 refer to?

I performed this same upgrade in a lab environment and did not see this 
behavior.

Thanks,
Mike

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