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[Rodolfo Alonso <rodolfo.alonso.hernandez@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1627749

Title:
  qos driver api can have better error handling

Status in networking-odl:
  Confirmed
Status in neutron:
  Fix Released

Bug description:
  the current qos (notification) driver api assumes driver methods are async and always success.
  however, it might not be the case for some of possible backends.  eg. a controller based implementation, where a driver would make a rest api call to the backend.

  - currently one of drivers raises an exception, the rest of drivers are simply skipped.
    it might not be what an api user would expect.

  - whan driver calls end up with an error, the db changes should be reverted, or
    the resource should be marked "possibly not sync".

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