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Excerpts from Chris Friesen's message of 2018-09-12 16:52:16 -0600:
> On 9/12/2018 12:04 PM, Doug Hellmann wrote:
> 
> >> This came up in a Vancouver summit session (the python3 one I think). General consensus there seemed to be that we should have grenade jobs that run python2 on the old side and python3 on the new side and test the update from one to another through a release that way. Additionally there was thought that the nova partial job (and similar grenade jobs) could hold the non upgraded node on python2 and that would talk to a python3 control plane.
> >>
> >> I haven't seen or heard of anyone working on this yet though.
> >>
> >> Clark
> >>
> > 
> > IIRC, we also talked about not supporting multiple versions of
> > python on a given node, so all of the services on a node would need
> > to be upgraded together.
> 
> As I understand it, the various services talk to each other using 
> over-the-wire protocols.  Assuming this is correct, why would we need to 
> ensure they are using the same python version?
> 
> Chris
> 

It's more a matter of trying to describe what test scenarios we
would run.  In this case we were saying that we're not going to try
to spend the effort upstream to test a mixed configuration on a
single node. Someone downstream might choose to do that, but we
didn't see value in it for the community to try to do it upstream.

Doug