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[Mark McClain <1083944@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron/folsom
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1083944

Title:
  RPC exchange name defaults to 'openstack'

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron folsom series:
  Won't Fix
Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) folsom series:
  Fix Released
Status in OpenStack Manuals:
  Fix Released

Bug description:
  Nova on stable/folsom is using 'openstack' as its exchange name.

  Openstack-common was updated on stable/folsom with this change:
  https://review.openstack.org/#/c/16532/

  Which brought in this change that removed the default 'nova' exchange config option:
  https://review.openstack.org/#/c/12876/

  """
  Make projects define 'control_exchange'.

  The 'control_exchange' option needs to have a project-specific default
  value. Just don't register this option and expect it to be registered
  by the project using this code, at least for now.

  ****** IMPORTANT NOTE WHEN IMPORTING THIS CHANGE ******

  If you are importing this change into a project that uses rpc, you must
  add the control_exchange option in your code!

  *******************************************************

  Change-Id: Ida5a8637c419e709bbf22fcad57b0f11c31bb959
  """

  But stable/folsom nova.conf was never updated.

  The control_exchange option has been removed from nova.conf on master too now:
  https://review.openstack.org/#/c/15940/


  Found this debugging a situation where a child cell couldn't eceive
  messages from a parent cell. Strangely, setting
  control_exchange='openstack' fixed our problem. We're still trying to
  work out *why* there was a mismatch in exchange names at all, given
  that all cells were running the same nova code and nearly identical
  configs.

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