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[OpenStack Infra <1576048@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/310691
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=34b8336a41e2896f0639c402f64a05247f475fea
Submitter: Jenkins
Branch:    master

commit 34b8336a41e2896f0639c402f64a05247f475fea
Author: Wenzhi Yu <wenzhi_yu@xxxxxxx>
Date:   Thu Apr 28 16:06:57 2016 +0800

    Make compute rpcapi 'live_migration' backward compatible
    
    This commit[1] added compute rpcapi version 4.2 which introduced a new
    argument 'migration' when calling 'live_migration' method, but the code
    did not ensure the backward compatibility with older version compute
    node.
    
    When calling 'live_migration' method with 'migration' argument on older
    version(like Kilo) of nova compute node, a "TypeError: live_migration()
    got an unexpected keyword argument 'migration'" will be threw up.
    
    [1]https://github.com/openstack/nova/commit/2f4e64a7cf81de4a22fe2fc4210b1f795b1a3db4
    
    Change-Id: Ie5c498d34e7c4c6573d611abd592c25f1bcb4f44
    Closes-Bug: #1576048


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1576048

Title:
  "live_migration" call in Liberty doesn't have backwards compatibility
  with Kilo

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  "live_migration" call in Liberty doesn't have backwards compatibility
  with Kilo.

  Liberty control plane and Kilo compute nodes.

  Doing live-migration and getting error below on compute node

  TypeError: live_migration() got an unexpected keyword argument
  'migration'

  Workaround(On controller): http://paste.openstack.org/show/495612/

  Environment
  ==========
  Libvirt+KVM, Ceph for VMs
  Liberty - Mirantis OpenStack 8.0 (2015.2)
  Kilo - 2015.1.3 tag

  Steps to reproduce
  ===============
  1) Install Liberty control plane (api, conductor, schduler, etc.)
  2) Install Kilo compute
  3) Add to nova.conf on controller
    [upgrade_levels]
    compute=kilo
  3) Try "nova live-migration VM"

  Expected result
  =============
  Migration will succeed

  Actual result
  ==========
  Traceback on compute node
  http://paste.openstack.org/show/495541/

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