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[all][interop][cinder][qa] API changes with/without microversion and Tempest verification of API interoperability

On Mon, 2019-09-16 at 17:11 -0500, Sean McGinnis wrote:
> > 
> > Backend/type specific information leaking out of the API dynamically like
> > that is definitely an interoperability problem and as you said it sounds
> > like it's been that way for a long time. The compute servers diagnostics API
> > had a similar problem for a long time and the associated Tempest test for
> > that API was disabled for a long time because the response body was
> > hypervisor specific, so we eventually standardized it in a microversion so
> > it was driver agnostic.
> > 
> Except this isn't backend specific information that is leaking. It's just
> reflecting the configuration of the system.
yes and config driven api behavior is also an iterop problem.
ideally you should not be able to tell if cinder is abcked by ceph or emc form the
api responce at all.

sure you might have a volume type call ceph and another called emc but both should be
report capasty in the same field with teh same unit.

ideally you would have a snapshots or gigabytes quota and option ly associate that with a volume types
but shanshot_ceph is not interoperable aross could if that exstis with that name solely becaue ceph was used on the
backend. as a client i would have to look at snapshost* to figure out my quotat and in princiapal that is an ubounded