Open Stack

> >>
> >> On Mon, Jun 22, 2015 at 5:40 AM, Jastrzebski, Michal
> >> <michal.jastrzebski at intel.com> wrote:
> >> > Hello,
> >> >
> >> > I wanted to start discussion about versioned objects backporting
> >> > for conductor-less projects.
> >> > In Vancouver we discussed compatibility mode, which works like that:
> >> >

Dan's blog post suggests that Nova already requires two restarts:
http://www.danplanet.com/blog/2015/06/26/upgrading-nova-to-kilo-with-minimal-downtime/

I added a bp/spec for this in Heat:
https://review.openstack.org/196670

There is also an approved spec in Cinder:
https://review.openstack.org/192037
which, to avoid restarts, stores the configuration in the DB.
This places a requirement for all services to have a direct access to the database, so it can't be used in all projects. Thang Pham also wrote a Cinder POC implementation: https://review.openstack.org/184404.

/ Greg