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[OpenStack Infra <1532695@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/350953
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=5264ab966d3db7b1cb698190872cbe6feaf48464
Submitter: Jenkins
Branch:    master

commit 5264ab966d3db7b1cb698190872cbe6feaf48464
Author: Nam Nguyen Hoai <namnh@xxxxxxxxxxxxxx>
Date:   Fri Aug 5 09:46:43 2016 +0700

    Using revision_number to ensure no overlap in *one* network
    
    This patch uses revision_number in database. When creating
    a subnet in a network, the revision_number of the network
    will be increased. That will prevent overlapping CIDR
    (overlapping CIDR means some subnets' cidrs are overlapping)
    on *one* network.
    
    Basically, in case of concurrent requests creating subnets
    on *one* network, only one request successes, other requests
    needs retrying request.
    
    Change-Id: Id6548535075bed87a4b36e1462db546ab9163f29
    Closes-Bug: #1532695


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1532695

Title:
  Created subnets on ONE network that duplicated CIDR  in case of
  neutron server active-active

Status in neutron:
  Fix Released

Bug description:
  I had three controllers.  I found a bug. I can create subnets on one
  network that duplicated CIDR range AT SAME TIMING

  How to reproduce:

  Topology : http://codepad.org/ff0debPB

  Step 1: Create a network
  $ neutron net-create test-net

  Step 2: Create multiple subnets that duplicated CIDR scope
  Please running commands AT SAME TIMMING
   - On controller1:
  $ neutron subnet-create --name test-subnet1 test-net 192.168.100.0/24
   - On controller2:
  $ neutron subnet-create --name test-subnet2 test-net 192.168.100.0/24

  After check subnet-list:

  Running command: $ neutron subnet-list
  This is the result: http://codepad.org/306Vi90d

  Running command: $ neutron net-list
  This is the result: http://codepad.org/AcYRLP4b

  After check database:
  This is the result: http://codepad.org/4qRC229P

  I think. In originally, one command on controller will be fail and we
  catch a message as following: "Invalid input for operation: Requested
  subnet with cidr: 192.168.100.0/24 for network: 39cc0850-1eeb-4c85
  -bcdc-338a3f1461aa overlaps with another subnet.". But currently, two
  commands are success

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