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[Daniel Alvarez <1883554@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Every time the agent liveness check is triggered (via API or periodically every agent_down_time / 2 seconds), there are a lot of writes into the SB database on the Chassis table.
These writes triggers recomputation on ovn-controller running in all nodes having a considerable performance hit, especially under stress.


After this commit was merged [0] we avoided bumping nb_cfg too frequently but still we're performing writes into the Chassis table to often, from all the workers.

We should use the same logic in [1] to avoid writes that have happened
recently.


[0] https://opendev.org/openstack/neutron/commit/647b7f63f9dafedfa9fb6e09e3d92d66fb512f0b
[1] https://github.com/openstack/neutron/blob/4de18104ae88a835544cefbf30c878aa49efc31f/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py#L1075

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ovn

** Tags added: ovn

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https://bugs.launchpad.net/bugs/1883554

Title:
  [ovn] Agent liveness checks create too many writes into OVN db

Status in neutron:
  New

Bug description:
  Every time the agent liveness check is triggered (via API or periodically every agent_down_time / 2 seconds), there are a lot of writes into the SB database on the Chassis table.
  These writes triggers recomputation on ovn-controller running in all nodes having a considerable performance hit, especially under stress.

  
  After this commit was merged [0] we avoided bumping nb_cfg too frequently but still we're performing writes into the Chassis table to often, from all the workers.

  We should use the same logic in [1] to avoid writes that have happened
  recently.

  
  [0] https://opendev.org/openstack/neutron/commit/647b7f63f9dafedfa9fb6e09e3d92d66fb512f0b
  [1] https://github.com/openstack/neutron/blob/4de18104ae88a835544cefbf30c878aa49efc31f/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py#L1075

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