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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/1200001

Title:
  Nicira plugin: concurrent instance creation leads to timeouts

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

Bug description:
  When instance are spawned from nova concurrently, either by
  concurrently submitting requests to nova, or by specifying
  num_instance > 1 on a create server request, the nicira plugin might
  fail in creating a port for the instance because of a NVP timeout in
  create_port

  The root cause for this timeout depends on the fact that the NVP
  request is executed within a SQL transaction, and is executed spawning
  an eventlet, thus manifesting a behaviour similar to the one observed
  in bug 1086173.

  This issue can be solved by moving the NVP operation outside of the
  sql transaction and ensuring orphaned resources, both in the database
  and NVP, are properly removed.

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