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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

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

** Changed in: nova
    Milestone: None => havana-3

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https://bugs.launchpad.net/bugs/1217044

Title:
  compute rpcapi 2.37 is not backwards compatible

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  patch 552693e4ad51291c8bfd28cd1939ed3609f6eeac
  (https://review.openstack.org/#/c/37933/) which added compute rpcapi
  version 2.37 does not provide any backwards compatibility, this should
  be done using 'self.can_send_version'

  The result of this is, if compute is running grizzly and trunk is
  running with

  [upgrade_levels]
  compute=grizzly

  in nova.conf

  nova-scheduler logs:

  2013-08-26 18:03:17.298 ERROR nova.scheduler.driver [req-a2699da5-38eb-44a4-a314-1c4ff2970e80 demo demo] Exception during scheduler.run_instance
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver Traceback (most recent call last):
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver   File "/opt/stack/nova/nova/scheduler/filter_scheduler.py", line 117, in schedule_run_instance
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver     legacy_bdm_in_spec=legacy_bdm_in_spec)
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver   File "/opt/stack/nova/nova/scheduler/filter_scheduler.py", line 200, in _provision_resource
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver     legacy_bdm_in_spec=legacy_bdm_in_spec)
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver   File "/opt/stack/nova/nova/compute/rpcapi.py", line 603, in run_instance
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver     version='2.37')
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver   File "/opt/stack/nova/nova/openstack/common/rpc/proxy.py", line 169, in cast
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver     self._set_version(msg, version)
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver   File "/opt/stack/nova/nova/openstack/common/rpc/proxy.py", line 72, in _set_version
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver     raise rpc_common.RpcVersionCapError(version_cap=self.version_cap)
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver RpcVersionCapError: Specified RPC version cap, 2.27, is too low
  2013-08-26 18:03:17.298 2923 TRACE nova.scheduler.driver
  2013-08-26 18:03:17.302 WARNING nova.scheduler.driver [req-a2699da5-38eb-44a4-a314-1c4ff2970e80 demo demo] [instance: 3da2957a-0161-4677-ac02-4a74993f15f5] Setting instance to ERROR state.

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