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On Wed, Dec 14, 2016 at 10:36:37AM +0300, Evgeniy Ivanov wrote:
> Hello!
> 
> I'm experiencing some kind of a bug, when I have a controller with mitaka
> and a controller with Newton.
> When I upgraded the first part of my cluster to Newton, the second part
> stopped to work (nova-api).
> 
> I got this error:
> oslo_service.service ServiceTooOld: This service is older (v9) than the
> minimum (v15) version of the rest of the deployment. Unable to continue.
> 
> So, as we can see, all those dialogs, manuals, docs, posts which are talking
> about compatibility between 2 releases are wrong, aren't they?
> 
> I will be happy to read some thoughts from you guys, thanks!
> 
> How to reproduce:
> Install nova 13 on 2 nodes
> Disable the first node
> Upgrade the first node to nova 14
> Restart nova-api on the second node (13 ver.)

At what point of http://docs.openstack.org/developer/nova/upgrade.html did you
hit the problem?  That will help us narrow down the search for you problem.

Yours Tony.
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