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[OpenStack Infra <1934420@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/800278
Committed: https://opendev.org/openstack/neutron/commit/9cffd7b3223c2e8c88129c79aa62c255350c55d4
Submitter: "Zuul (22348)"
Branch:    master

commit 9cffd7b3223c2e8c88129c79aa62c255350c55d4
Author: Elvira García <egarciar@xxxxxxxxxx>
Date:   Fri Jul 9 17:55:56 2021 +0200

    [OVN] Change ControllerAgent type dinamically
    
    The ControllerAgent class now changes in Openstack when changing the
    type of an agent in its ovsdb table. This is possible thanks to adding a
    new condition to the event that triggered the update of the AgentCache.
    If the right external_ids changed, a new agent with the correct class
    will replace the old one in the AgentCache. Also adds functional
    tests to check this.
    
    Closes-Bug: #1934420
    
    Signed-off-by: Elvira García <egarciar@xxxxxxxxxx>
    Change-Id: I75380c455864aa055e8049a6beff8619687b52ce


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

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https://bugs.launchpad.net/bugs/1934420

Title:
  [OVN]ControllerAgent cannot be changed to ControllerGatewayAgent
  dynamically

Status in neutron:
  Fix Released

Bug description:
  I have 3 nodes. NodeA, NodeB, NodeC.

  I execute cmd 'ovs-vsctl set open_vswitch . external-ids:ovn-cms-
  options=enable-chassis-as-gw' in NodeA and NodeV, as gateway Node.

  show agent list by executing the command 'openstack network agent
  list':

  NodeA is 'OVN Controller Gatewaty agent'
  NodeB is 'OVN Controller Gatewaty agent'
  NodeC is 'OVN Controller agent'

  the result is the same as I expected.

  next I execute cmd 'ovs-vsctl set open_vswitch . external-ids:ovn-cms-
  options=enable-chassis-as-gw' in NodeC,

  show agent list by executing the command 'openstack network agent
  list':

  NodeA is 'OVN Controller Gatewaty agent'
  NodeB is 'OVN Controller Gatewaty agent'
  NodeC is 'OVN Controller agent'

  The NodeC is still 'OVN Controller agent', not 'OVN Controller
  Gatewaty agent', The command has been executed many times and the
  result is still unchanged.

  But as long as I execute the command to restart the neutron service,
  the result will be correct. NodeC is 'OVN Controller Gatewaty agent'.

  Similarly, the 'OVN Controller Gatewaty agent' cannot be turned into
  'OVN Controller agent' without restarting the neutron service.

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