Neutron DHCP agent warning "Could not load neutron.agent.linux.interface.OVSInterfaceDriver"

[Anton Kremenetsky]

There are following warnings in log of the Neutron DHCP agent:

2018-02-07 16:55:18.053 13609 WARNING stevedore.named [req-279ba174-960f-43e6-a47f-852dcf5bb9ff - - - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:55:24.676 13609 WARNING stevedore.named [req-1d6aa771-b3eb-4c2a-babc-5c55c211c019 - - - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:55:38.612 13609 WARNING stevedore.named [req-59d682aa-3bbe-460e-8327-10249e1df666 - - - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:55:44.194 13609 WARNING stevedore.named [req-ce7056b1-a5ba-45ed-b79f-ec0fbf6282b3 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:55:45.598 13609 WARNING stevedore.named [req-64597eaf-b2b9-4c3c-a8ac-403755c54077 d8678c8f81a14312a935985bb0302f37 66886a173e5a4b99af20f721b9be642b - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:55:58.037 13609 WARNING stevedore.named [req-95e87572-f3b6-46da-868f-2cda5be9afe6 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:55:59.435 13609 WARNING stevedore.named [req-c9f36c08-f70a-4592-aa25-b72ca53d3c86 d8678c8f81a14312a935985bb0302f37 66886a173e5a4b99af20f721b9be642b - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:27.686 13609 WARNING stevedore.named [req-fc753821-eb2b-4a05-bb37-2df8c3a49fe8 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:30.629 13609 WARNING stevedore.named [req-0692798d-440a-4d3f-ae5b-7726a9f307c9 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:34.391 13609 WARNING stevedore.named [req-321df85a-e1d6-4319-87c6-bb1e6e818def 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:36.282 13609 WARNING stevedore.named [req-997f7665-a3eb-482f-8e80-dc9176e041b6 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:38.183 13609 WARNING stevedore.named [req-be45f1a0-0126-4330-8a8a-70eeefec15a7 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:40.094 13609 WARNING stevedore.named [req-f3e66470-e865-48fa-85f8-a2d23ede2739 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:41.681 13609 WARNING stevedore.named [req-f3e66470-e865-48fa-85f8-a2d23ede2739 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver
2018-02-07 16:58:41.682 13609 WARNING stevedore.named [req-f3e66470-e865-48fa-85f8-a2d23ede2739 2dd9600af36e48768474748285322f43 300643c3aee8427abbf9bb551120345e - - -] Could not load neutron.agent.linux.interface.OVSInterfaceDriver

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/541815

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/541815
Committed: https://git.openstack.org/cgit/openstack/charm-neutron-gateway/commit/?id=bf0cdcf9ee8898d53c4b0d8a347aa31a931feba2
Submitter: Zuul
Branch: master

commit bf0cdcf9ee8898d53c4b0d8a347aa31a931feba2
Author: Anton Kremenetsky <email address hidden>
Date: Wed Feb 7 20:27:07 2018 +0300

    load interface_driver using a symbolic name

    Instead of relying on a full class path let's use symbolic names and
    namespaces from setup.cfg which relies on stevedore to use a proper
    class. This can only be used for code-paths that do not rely on direct
    usage of importlib which is not the case for the metering agent, which
    is why its config is left untouched.

    Co-Authored-By: Anton Kremenetsky <email address hidden>
    Co-Authored-By: Dmitrii Shcherbakov <email address hidden>
    Change-Id: I4d3389a0fe376fed87265f51fdd69caf14fb3b16
    Closes-Bug: #1747964

[James Page (james-page)]

Triaging the remaining bug task as high - this will impact on DVR based deployments and deployments which make use of neutron-dhcp on compute for alternative SDN options.

[Anton Kremenetsky (akremenetsky)]

https://review.openstack.org/579541

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/579541
Committed: https://git.openstack.org/cgit/openstack/charm-neutron-openvswitch/commit/?id=c8725a6c6e7aef2f107446d1e2612100648694c9
Submitter: Zuul
Branch: master

commit c8725a6c6e7aef2f107446d1e2612100648694c9
Author: Anton Kremenetsky <email address hidden>
Date: Mon Jul 2 15:30:31 2018 +0300

    load interface_driver using a symbolic name

    The original fix description
    https://review.openstack.org/#/c/541815/

    Change-Id: Ifa9dca8cf634561dab0fee9a26711678a50379bf
    Signed-off-by: Anton Kremenetsky <email address hidden>
    Closes-Bug: #1747964