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Excerpts from Doug Hellmann's message of 2018-02-19 10:15:34 -0500:
> Excerpts from Michael Bayer's message of 2018-02-19 10:00:59 -0500:
> > Hi list -
> > 
> > Apparently Cinder was misled by my deprecations within the
> > oslo_db.sqlalchemy.test_base package of DbFixture and DbTestCase, and
> > in https://review.openstack.org/#/c/522290/ the assumption was made
> > that these should be imported from oslo_db.tests.sqlalchemy.    This
> > is an immense mistake on my part that I did not expect people to go
> > looking for the same names elsewhere in private packages and now we
> > have a serious downstream issue as these modules are not packaged, as
> > well as the possibility that the oslo_db.tests. package is now locked
> > in time and I have to add deprecations there also.
> > 
> > If anyone knows of projects (or feels like helping me search) that are
> > importing *anything* from oslo_db.tests these must be reverted ASAP.
> > 
> 
> If we have modules or classes we don't expect people to be importing
> directly, we need to prefix the names with _ to comply with the naming
> conventions we have previously told everyone to look for to recognize
> private code.
> 
> I think it's safe to treat "tests" as an exception (after resolving
> this case) but we should probably document that.
> 
> Doug

Once we resolve the current set of imports, we can land a patch like
https://review.openstack.org/545859 to prevent this from happening in
the future.

Doug