[openstack-dev] [goals][python3] mixed versions?

Doug Hellmann doug at doughellmann.com
Thu Sep 13 23:41:58 UTC 2018

Excerpts from Mathieu Gagné's message of 2018-09-13 14:12:56 -0400:
> On Wed, Sep 12, 2018 at 2:04 PM, Doug Hellmann <doug at doughellmann.com> wrote:
> >
> > 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.
> >
> Will services support both versions at some point for the same
> OpenStack release? Or is it already the case?
> I would like to avoid having to upgrade Nova, Neutron and Ceilometer
> at the same time since all end up running on a compute node and
> sharing the same python version.

We need to differentiate between what the upstream community supports
and what distros support. In the meeting in Vancouver, we said that
the community would support upgrading all of the services on a
single node together. Distros may choose to support more complex
configurations if they choose, and I'm sure patches related to any
bugs would be welcome. But I don't think we can ask the community
to support the infinite number of variations that would occur if
we said we would test upgrading some services independently of
others (unless I'm mistaken, we don't even do that for services
all using the same version of python 2, today).


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