[oslo][release] Oslo's Transition To Independent

Ben Nemec openstack at nemebean.com
Wed Nov 4 14:49:57 UTC 2020

On 11/4/20 7:31 AM, Herve Beraud wrote:
> Greetings,
> Is it time for us to move some parts of Oslo to the independent release 
> model [1]?
> I think we could consider Oslo world is mostly stable enough to answer 
> yes to the previous question.
> However, the goal of this email is to trigger the debat and see which 
> deliverables could be transitioned to the independent model.
> Do we need to expect that major changes will happen within Oslo and who 
> could warrant to continue to follow cycle-with-intermediary model [2]?

I would hesitate to try to predict the future on what will see major 
changes and what won't. I would prefer to look at this more from the 
perspective of what Oslo libraries are tied to the OpenStack version. 
For example, I don't think oslo.messaging should be moved to 
independent. It's important that RPC has a sane version to version 
upgrade path, and the easiest way to ensure that is to keep it on the 
regular cycle release schedule. The same goes for other libraries too: 
oslo.versionedobjects, oslo.policy, oslo.service, oslo.db, possibly also 
things like oslo.config and oslo.context (I suspect contexts need to be 
release-specific, but maybe someone from a consuming project can weigh 
in). Even oslo.serialization could have upgrade impacts if it is being 
used to serialize internal data in a service.

That said, many of the others can probably be moved. oslo.i18n and 
oslo.upgradecheck are both pretty stable at this point and not really 
tied to a specific release. As long as we're responsible with any future 
changes to them it should be pretty safe to make them independent.

This does raise a question though: Are the benefits of going independent 
with the release model sufficient to justify splitting the release 
models of the Oslo projects? I assume the motivation is to avoid having 
to do as many backports of bug fixes, but if we're mostly doing this 
with low-volume, stable projects does it gain us that much?

I guess I don't have a strong opinion one way or another on this yet, 
and would defer to our release liaisons if they want to go one way or 
other other. Hopefully this provides some things to think about though.


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