Comment 2 for bug 1972867

We are facing the same issue on our internal NetApp CI while running Manila MySQL `test_walk_versions`.

I might misunderstanding the neutron fix [1], it does not fit very well on Manila walk tests: I implemented the same solution [2], and it took much longer time to finish the test. On my internal VM it didn't work, slowing down the execution.

I just wondered why the test walks do a snake and downgrade. During upgrade test, the snake option makes the downgrade tests. What if we ignore the reverse walk [3] ?

[1] https://review.opendev.org/c/openstack/neutron/+/770935
[2] https://review.opendev.org/c/openstack/manila/+/852005
[3] https://github.com/openstack/manila/blob/master/manila/tests/db/migrations/alembic/test_migration.py#L93-L98