Okay. The quick fix is to remove the extra Glance V2 call when 
CONF.allowed_direct_url_schemes is disabled.

 https://review.openstack.org/#/c/40426/1

This effectively avoids calling the Glance V2 API on python 2.6 (thus avoiding 
the schema validation issue).

The real issue here is still unresolved however and it looks like we still have 
some work to do to get all the fancy new Glance V2 stuff fully working on 
python 2.6 distros (RHEL/Centos, etc).

Dan

----- Original Message -----
> From: "Dan Prince" <[email protected]>
> To: "OpenStack Development Mailing List" <[email protected]>
> Sent: Monday, August 5, 2013 9:01:40 PM
> Subject: [openstack-dev] instances fail to boot on el6 (glance schema error   
> issue)
> 
> As of an hour ago the el6 (Centos) builds in SmokeStack all started failing.
> I've documented the initial issue I'm seeing in this ticket:
> 
>  https://bugs.launchpad.net/nova/+bug/1208656
> 
> The issue seems to be that we now hit a SchemaError which bubbles up from
> glanceclient when the new direct download plugin code runs. This only seems
> to happen on distributions using python 2.6 as I'm not seeing the same thing
> on Fedora.
> 
> This stack trace also highlights the fact that the Glance v2 API now seems to
> be a requirement for Nova... and I'm not sure this is a good thing
> considering we still use the v1 API for many things as well. Ideally we'd
> have all Nova -> Glance communication use a single version of the Glance API
> (either v1 or v2... not both) right?
> 
> Dan

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