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[Alan Pevec <1263866@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1263866

Title:
  OVS lib deferred apply cannot handle concurrency

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron havana series:
  Fix Released
Status in neutron icehouse series:
  Fix Released

Bug description:
  OVS lib propose a deferred apply methods to save system calls to 'ovs-
  ofctl' binaries ('ovs-ofctl' can apply flow from file or stdin if file
  is '-').

  This method use a dict for 'add', mod' or 'del' flow actions that contain a concatenated string flows. This dict is purge after all flows are applied at the end of 'deferred_apply_off' method.
  If another call is made on that dict during the 'deferred_apply_off', some flows could be deleted a the end when they have not been applied.

  I can see that on ML2 plugin with l2-pop mechanism driver. If I delete
  more than one port at a time, some flooding flow rules could be not
  deleted on the br-tun bridge.

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