[OVN] Left-over namespaces left in the environment by ovn-metadata-agent

[Lucas Alvares Gomes]

After running performance tests (with browbeat [0]) in a lab it was noticed that the ovn-metadata-agent is leaving some namespaces left in the environment:

$ ip netns
ovnmeta-99cb0c5f-5f1d-4634-977c-0ef5ea0ef3d0 (id: 4)
ovnmeta-5467b566-4a63-49f8-a9dc-105f0399e890 (id: 3)
ovnmeta-a20ab2b6-74a0-42cf-8206-6dfa570e957c (id: 2)
ovnmeta-ab536132-e15e-474e-b511-a2569a35b540 (id: 1)
...

Things are cleaned up upon restarting the ovn-metadata-agent service/container:

2019-06-07 12:23:09.065 1047753 INFO networking_ovn.agent.metadata.agent [-] Cleaning up ovnmeta-a17e6f3e-ea14-45b8-aba4-8212019ed58a namespace which is not needed anymore
2019-06-07 12:23:10.136 1047753 INFO networking_ovn.agent.metadata.agent [-] Cleaning up ovnmeta-bec3e303-ea0a-465a-8a4f-50505b114fd5 namespace which is not needed anymore
2019-06-07 12:23:11.206 1047753 INFO networking_ovn.agent.metadata.agent [-] Cleaning up ovnmeta-c81b8353-286c-46ab-b0f0-5ecbc45c98c0 namespace which is not needed anymore
2019-06-07 12:23:12.292 1047753 INFO networking_ovn.agent.metadata.agent [-] Cleaning up ovnmeta-24d8793c-a3ae-4d57-8620-9f1318d8cf6e namespace which is not needed anymore
...

[0] https://github.com/cloud-bulldozer/browbeat

[Daniel Alvarez (dalvarezs)]

Likely because we're just monitoring the UPDATE of Port_Binding table [0] and a port may be deleted before it transitions to up so we should react to deletion of rows.

[0] https://github.com/openstack/networking-ovn/blob/6.0.0.0rc1/networking_ovn/agent/metadata/agent.py#L75

[Lucas Alvares Gomes (lucasagomes)]

The OVN driver now lives in the neutron repository. Moving this bug to their tracker.

[Lucas Alvares Gomes (lucasagomes)]

Fixed by https://review.opendev.org/#/c/713956/