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[Isaku Yamahata <1627044@xxxxxxxxxxxxxxxxxx>]

** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1627044

Title:
  Last chance call to neutron if VIF plugin notification is lost

Status in neutron:
  New
Status in OpenStack Compute (nova):
  In Progress

Bug description:
  While spawning a new VM, Nova waits for event from Neutron that its
  port is configured. In some cases Neutron event is lost (e.g. RabbitMQ
  issue) and if vif_plugging_is_fatal=True (it is by default) the
  instance is set to ERROR state. It happens even if in fact port is
  ACTIVE on Neutron side and all should work fine.

  This workflow could be improved by calling Neutron before failing.
  Nova could check real state of each port in Neutron just before setting the instance in ERROR (if at least one port is not ACTIVE).

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