[Bug 1506257] Re: rpcapi version mismatch possible on upgrade

[Edward Hope-Morley]

** Branch linked: lp:~hopem/nova/icehouse-lp1506257

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https://bugs.launchpad.net/bugs/1506257

Title:
  rpcapi version mismatch possible on upgrade

Status in nova package in Ubuntu:
  In Progress

Bug description:
  The SRU recently landed for
  https://bugs.launchpad.net/nova/+bug/1349888 introduced a potential
  upgrade regression if nova services are not upgraded all at once.

  2015-10-14 20:45:00.778 10909 TRACE nova.api.openstack RemoteError: Remote error: UnsupportedVersion Endpoint does not support RPC version 3.35
  2015-10-14 20:45:00.778 10909 TRACE nova.api.openstack [u'Traceback (most recent call last):\n', u'  File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply\n    incoming.message))\n', u'  File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 185, in _dispatch\n    raise UnsupportedVersion(version)\n', u'UnsupportedVersion: Endpoint does not support RPC version 3.35\n'].

  Basically, if nova-compute services are updated after nova-api
  services you will hit this issue if you perform volume operations. A
  simple solution, if possible, is to upgrade nova-compute services so
  that they are all in sync but I still want to remove the possibility
  for regression while keeping the fix from 1349888. I will propose an
  SRU shortly to resolve this.

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