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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

If the  DVR+HA router has external gateway, the snat-namespace will be initialized twice during agent restart.
And that initialized function will run many [1][2] external resource processing actions which will definitely increase the starting time of agent.

https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_snat_ns.py#L31-L39
https://github.com/openstack/neutron/blob/master/neutron/agent/l3/namespaces.py#L91-L108

** Affects: neutron
     Importance: Medium
         Status: New

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https://bugs.launchpad.net/bugs/1850779

Title:
  [L3] snat-ns will be initialized twice for DVR+HA routers during agent
  restart

Status in neutron:
  New

Bug description:
  If the  DVR+HA router has external gateway, the snat-namespace will be initialized twice during agent restart.
  And that initialized function will run many [1][2] external resource processing actions which will definitely increase the starting time of agent.

  https://github.com/openstack/neutron/blob/master/neutron/agent/l3/dvr_snat_ns.py#L31-L39
  https://github.com/openstack/neutron/blob/master/neutron/agent/l3/namespaces.py#L91-L108

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