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 -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1883554/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
