Public bug reported:

In the Instance object, on a remotable operation such as save(), we
refresh the pci_devices and security_groups with the information we get
back from the database. Since this *replaces* the objects currently
attached to the instance object (which might be backlevel) with current
versions, an older client could get a failure upon deserializing the
result.

We need to figure out some way to either backport the results of
remoteable methods, or put matching backlevel objects into the instance
during the refresh in the first place.

** Affects: nova
     Importance: Medium
     Assignee: Dan Smith (danms)
         Status: Confirmed


** Tags: unified-objects

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https://bugs.launchpad.net/bugs/1361683

Title:
  Instance pci_devices and security_groups refreshing can break
  backporting

Status in OpenStack Compute (Nova):
  Confirmed

Bug description:
  In the Instance object, on a remotable operation such as save(), we
  refresh the pci_devices and security_groups with the information we
  get back from the database. Since this *replaces* the objects
  currently attached to the instance object (which might be backlevel)
  with current versions, an older client could get a failure upon
  deserializing the result.

  We need to figure out some way to either backport the results of
  remoteable methods, or put matching backlevel objects into the
  instance during the refresh in the first place.

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