yahoo-eng-team team mailing list archive

[Armando Migliaccio <1500365@xxxxxxxxxxxxxxxxxx>]

We are aware of some of the limitations of the existing API. This will
definitely require more attention across the board. Marking RFE, to
raise the profile of this bug and seek input from members of the drivers
team.

** Tags added: rfe

** Changed in: neutron
       Status: Opinion => Triaged

** Changed in: neutron
       Status: Triaged => Confirmed

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

Title:
  neutron port API does not support atomicity

Status in neutron:
  Confirmed

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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