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

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

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https://bugs.launchpad.net/bugs/1258150

Title:
  nicira: tempest fails to delete routers in parallel

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  when parallel tempest tests are enabled, the nicira plugin shows erros when deleting routers.
  Parallel operations indeed cause the usual eventlet/mysql deadlock in delete_router as the nvp operation is nested within the db transaction.

  The root cause for the deadlock is that the nvp api client uses
  eventlet to dispatch requests.

  while a solution might be to rework the API client, an easier,
  backportable solution would be to move the NVP operation out of the
  transaction and ensuring consistency in case of failure.

  note: in the same delete_router routine also the metada access network
  handling should be moved out of the transaction.

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