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


On Tue, 2019-09-17 at 09:23 -0400, Eric Harney wrote:
> On 9/16/19 6:59 PM, Sean Mooney wrote:
> > 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
> > set.
> 
> I think you are confusing types vs backends here.  In my example, it was 
> called "snapshots_ceph" because there was a type called "ceph".  That's 
> an admin choice, not a behavior of the API.
or it could have been express in the api with a dedicated type filed and 

so you would always have a snapshots filed regardless of the volume type but have a since
type filed per quota set  that identifed what type it applied too.