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Hi!

> >
> > Unknown column 'user.name' in 'field list'
> >
> > in some operation when the DB is already upgraded to Mitaka, but some
> > keystone instances in a HA setup are still Liberty.
> 
> Currently we don't support rolling upgrades in keystone. To do an upgrade,
> you need to upgrade all keystone service instances at once, instead of going
> one-by-one, which means you have to plan for downtime of the keystone
> API.
> 

Thanks, then I'll try to minimize the upgrade window as small as possible for keystone.

> >
> > Is this change is intentional? Should I ignore the problem and just
> > upgrade all instances as fast as possible? Or I just overlooked something?
> >
> 
> You are right that there will be an error if you try running Liberty+Mitaka,
> since the database schema is not compatible. We have an ongoing effort to
> support online schema migrations, but it didn't make into Mitaka. [1] [2]
> 
> We will have a presentation about Online DB Migrations at the summit (in the
> upstream development track), so if you are interested, you can attend or
> watch the recorded session afterwards [3]. There will also be a discussion
> about this in keystone meetings at the design summit. [4]

Great, hope the next version(s) will handle rolling upgrades.

Br,
György

> 
> [1] https://specs.openstack.org/openstack/keystone-
> specs/specs/mitaka/online-schema-migration.html
> [2] https://review.openstack.org/#/c/274079/
> [3] https://www.openstack.org/summit/austin-2016/summit-
> schedule/events/7639
> [4] https://etherpad.openstack.org/p/keystone-newton-summit-brainstorm
> 
> 
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