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[Joe Gordon <1214683@xxxxxxxxxxxxxxxxxx>]

We now test this with the partial-ncpu job.

** Changed in: nova
       Status: Triaged => Fix Released

** Changed in: grenade
       Status: New => Fix Released

** No longer affects: openstack-ci

** Changed in: devstack
       Status: New => Fix Released

** Changed in: nova
     Assignee: (unassigned) => Joe Gordon (jogo)

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https://bugs.launchpad.net/bugs/1214683

Title:
  RPC compatibility required across minor RPC changes but not tested

Status in devstack - openstack dev environments:
  Fix Released
Status in Grenade - OpenStack upgrade testing:
  Fix Released
Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  We require minor changes to any RPCAPI to be backwards compatible
  (http://docs.openstack.org/developer/nova/api/nova.rpc.dispatcher.html)
  to help make rolling upgrades possible ( for example to allow a
  grizzly scheduler talk to a havana compute), but we have no testing
  mechanism in place to make sure this works.  Since this kind of
  backwards compatibility is tricky and we have no testing for it there
  is a very very small probability that it works at all.

  A test for this would require setting up a devstack environment with
  two copies of the nova source tree and running some services from the
  latest patch and some from the oldest nova version that supports the
  same major RPCAPI version.  Although to start with perhaps we should
  just test the most recent release versus trunk.

  Another option is to test against HEAD^ and test the continuous deploy
  case, where each patch is pushed out one by one.

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