[openstack-dev] [cinder] Rolling upgrades - missing pieces

Dulko, Michal michal.dulko at intel.com
Mon Oct 19 17:48:15 UTC 2015

On Mon, 2015-10-19 at 11:19 -0500, Sean McGinnis wrote:
> On Mon, Oct 19, 2015 at 03:10:16PM +0000, Dulko, Michal wrote:
> > Hi all,
> > 
> > One of our priority goals for Liberty was the adoption of
> > oslo.versionedobjects in order for Cinder to achieve ability to do
> > rolling upgrades. We weren't successful with that in L, and work got
> > postponed to Mitaka. I want to highlight remaining work in that topic as
> > well as other pieces that are still missing in order for Cinder to
> > support no-downtime-upgrades.
> > 
> <snip>
> > 
> > Changing this is required for us to be able to remove or rename fields
> > in these dictionaries and still be able to provide interoperability of
> > services working in different versions.
> > 
> > I would love to get some feedback on these thoughts and possibly start a
> > pre-summit discussion on the whole topic.
> Thanks for bringing this up Michal. Will you be around for the weekly
> meeting this week? It would be great if we could get this on the agenda
> just to make sure everyone is aware of it. 
> That may help to make sure more folks have had a chance to think about
> this, even briefly, before the design summit.
> Thanks!
> Sean

I've added an item to the agenda. This is a big topic, but I'll try to
prepare some general questions to shape the discussion a little.

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