[openstack-dev] [nova][db] Thoughts on making instances.uuid non-nullable?

Jay Pipes jaypipes at gmail.com
Mon Dec 16 18:24:21 UTC 2013

On 12/16/2013 11:59 AM, Russell Bryant wrote:
> On 12/16/2013 11:45 AM, Matt Riedemann wrote:
>> 1. Add a migration to change instances.uuid to non-nullable. Besides the
>> obvious con of having yet another migration script, this seems the most
>> straight-forward. The instance object class already defines the uuid
>> field as non-nullable, so it's constrained at the objects layer, just
>> not in the DB model.  Plus I don't think we'd ever have a case where
>> instance.uuid is null, right?  Seems like a lot of things would break
>> down if that happened.  With this option I can build on top of it for
>> the DB2 migration support to add the same FKs as the other engines.
> Yeah, having instance.uuid nullable doesn't seem valuable to me, so this
> seems OK.



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