[ovn]Router scheduler failing for config "default_availability_zones"

[ZhouHeng]

I have 3 gateway chassis and all available zones are nova, have 1 chassis.
The default_availability_zones=zone1 are configured in the neutron.conf.

I create router and not set availability_zone_hits, I can create router success and router's availability_zones=zone1, though ovn-nbctl command, can found router's gateway_chassis include all chassis(4 nodes).

I think should fail in this case, indicating that the available_zone does not exist.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/802665

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/802665
Committed: https://opendev.org/openstack/neutron/commit/7988ab5df0eb0799811d50eb90f0b292d008f700
Submitter: "Zuul (22348)"
Branch: master

commit 7988ab5df0eb0799811d50eb90f0b292d008f700
Author: zhouhenglc <email address hidden>
Date: Wed Jul 28 15:25:39 2021 +0800

    "default_availability_zones" need to be considered when validate az

    If not set availability_zone_hits when create router, should use
    configuration parameter default_availability_zones.
    At present, only the creation parameters are validate, and the default
    availability zones not validate.
    Creating a network is the same as creating a route.

    Closes-bug: #1938261

    Change-Id: I1c7f50b69a31d725b762e3061f09a0bd5b077a58

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 19.0.0.0rc1 release candidate.