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[OpenStack Infra <1625867@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/373566
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=9019ff2f744ae91839d05a188358ef92343add43
Submitter: Jenkins
Branch:    master

commit 9019ff2f744ae91839d05a188358ef92343add43
Author: Kevin Benton <kevin@xxxxxxxxxx>
Date:   Mon Sep 19 18:44:02 2016 -0700

    Make DHCP agent use 'revision_number'
    
    Change I445974b0e0dabb762807c6f318b1b44f51b3fe15 updated the
    'revision' field to 'revision_number' but it missed the DHCP
    agent and subsequently broke it's ability to detect stale updates.
    
    This fixes the name in the agent.
    
    This is marked as a partial for 1622616 because one of the reasons
    the agent was frequently updating the DHCP port was in reaction
    to stale port update messages for its own port.
    
    Partial-Bug: #1622616
    Closes-Bug: #1625867
    Change-Id: Id41000127e1084f7ff243f8dc9c399999fbdaab4


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

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https://bugs.launchpad.net/bugs/1625867

Title:
  dhcp agent not discarding stale updates

Status in neutron:
  Fix Released

Bug description:
  The DHCP agent ends up asking for IPs on subnets it already has IPs on
  because of the following  order of events:

  
  neutron_port_create (for DHCP port)
  neutron_port_status_update (from l2 agent for dhcp port)
  neutron_subnet_create

  However, because the dhcp agent uses a semaphore, events may be
  processed in this order

  subnet_create_end (which DHCP agent uses to update dhcp port)
  port_update_end (which has the DHCP agent's port from port_status_update and causes the agent to think IPs have changed and retriggers a request to the server)

  The issue here is that the agent is recognizing the port update
  message as stale.

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