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[Bug 1194566] Re: Race condition exists for ip uniqueness

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Maru Newby <marun@xxxxxxxxxx>
Date: Tue, 25 Jun 2013 18:51:20 -0000
Reply-to: Bug 1194566 <1194566@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Oops - I missed the composite primary key on IPAllocation.

** Changed in: quantum
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1194566

Title:
  Race condition exists for ip uniqueness

Status in OpenStack Quantum (virtual network service):
  Invalid

Bug description:
  The ip uniqueness check is being done in code
  (https://github.com/openstack/quantum/blob/master/quantum/db/db_base_plugin_v2.py#L537)
  without explicit locking, which opens the door to a race condition if
  multiple requests try to secure the same ip.

  
  It probably makes sense to move the check into a uniqueness constraint on the model.

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