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[Balazs Gibizer <balazs.gibizer@xxxxxxxxxxxx>]

Public bug reported:

Neutron port API offers an update method where the user of the API can say "I use this port" by setting the device_owner and device_id fields of the port. However the neutron API does not prevent port allocation race conditions.
The API semantic is that a port is used if the device_id and the device_owner fields are set, and not used if they aren't.  Now lets have two clients that both want to set the ownership of the port. Both clients first have to check if the port is free or not by checking the value of the device_owner and device_id fields of the port, then they have to set the those fields to express ownership. 
If the two clients act parallel it is pretty much possible that both clients see that the fields are empty and both issue the port update command. This can leads to race conditions between clients.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1500365

Title:
  neutron port API does not support atomicity

Status in neutron:
  New

Bug description:
  Neutron port API offers an update method where the user of the API can say "I use this port" by setting the device_owner and device_id fields of the port. However the neutron API does not prevent port allocation race conditions.
  The API semantic is that a port is used if the device_id and the device_owner fields are set, and not used if they aren't.  Now lets have two clients that both want to set the ownership of the port. Both clients first have to check if the port is free or not by checking the value of the device_owner and device_id fields of the port, then they have to set the those fields to express ownership. 
  If the two clients act parallel it is pretty much possible that both clients see that the fields are empty and both issue the port update command. This can leads to race conditions between clients.

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