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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

For instance:
This neutron server was restarted 6 seconds earlier than l3-agent with a RPC version upgrading:
http://logs.openstack.org/71/633871/5/check/neutron-grenade-dvr-multinode/3fcd71c/logs/screen-q-svc.txt.gz#_Feb_10_06_32_10_279268
http://logs.openstack.org/71/633871/5/check/neutron-grenade-dvr-multinode/3fcd71c/logs/screen-q-l3.txt.gz#_Feb_10_06_32_16_750133

And then, we met many UnsupportedVersion exception:
http://logs.openstack.org/71/633871/5/check/neutron-grenade-dvr-multinode/3fcd71c/logs/screen-q-svc.txt.gz#_Feb_10_06_38_05_749257

This issue can also be seen in our local dev branch. A workaround is
restart the agent first, and then the neutron server.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1815463

Title:
  [dev] Agent RPC version does not auto upgrade if neutron-server
  restart first

Status in neutron:
  New

Bug description:
  For instance:
  This neutron server was restarted 6 seconds earlier than l3-agent with a RPC version upgrading:
  http://logs.openstack.org/71/633871/5/check/neutron-grenade-dvr-multinode/3fcd71c/logs/screen-q-svc.txt.gz#_Feb_10_06_32_10_279268
  http://logs.openstack.org/71/633871/5/check/neutron-grenade-dvr-multinode/3fcd71c/logs/screen-q-l3.txt.gz#_Feb_10_06_32_16_750133

  And then, we met many UnsupportedVersion exception:
  http://logs.openstack.org/71/633871/5/check/neutron-grenade-dvr-multinode/3fcd71c/logs/screen-q-svc.txt.gz#_Feb_10_06_38_05_749257

  This issue can also be seen in our local dev branch. A workaround is
  restart the agent first, and then the neutron server.

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