Failed to update object doesn't have attribute

Bug #1615922 reported by Hiroyuki Eguchi on 2016-08-23
This bug affects 3 people
Affects Status Importance Assigned to Milestone
Hiroyuki Eguchi

Bug Description

I'm evaluating a rolling upgrade of nova from liberty to mitaka in sr-iov environment.

The following error occurred in resource_tracker in case controller node is mitaka and compute node is liberty.

Error updating resources for node compute0: Cannot load 'parent_addr' in the base classTraceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nova/conductor/", line 85, in _object_dispatch
    return getattr(target, method)(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/", line 223, in wrapper
    return fn(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/nova/objects/", line 251, in save
    updates = self.obj_get_changes()
  File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/", line 604, in obj_get_changes
    changes[key] = getattr(self, key)
  File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/", line 67, in getter
  File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/", line 580, in obj_load_attr
    _("Cannot load '%s' in the base class") % attrname)
NotImplementedError: Cannot load 'parent_addr' in the base class

The cause of error is that a parent_addr parameter which has been added newly since mitaka is not set correctly.

We should consider a old version object doesn't have a new attribute when updating.

Changed in nova:
assignee: nobody → Hiroyuki Eguchi (h-eguchi)

Fix proposed to branch: master

Changed in nova:
status: New → In Progress
description: updated
Changed in oslo.versionedobjects:
assignee: nobody → Hiroyuki Eguchi (h-eguchi)
no longer affects: nova
summary: - pci device object doesn't set correctly during rolling upgrade
+ Failed to update object doesn't have attribute
description: updated
Hiroyuki Eguchi (h-eguchi) wrote :

Fix proposed to branch: master

Changed in oslo.versionedobjects:
status: New → In Progress
Hiroyuki Eguchi (h-eguchi) wrote :

Could anyone review this?

sirswa (sirswa) wrote :

Is there any update? We are hitting this issue now.
controller running mitaka and compute nodes in liberty.

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