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

Jay Pipes jaypipes at gmail.com
Mon Mar 10 02:18:33 UTC 2014

On Mon, 2014-03-10 at 10:05 +0800, ChangBo Guo wrote:
> 2014-03-10 4:47 GMT+08:00 Jay Pipes <jaypipes at gmail.com>:
>         > 3. This would make the instances and shadow_instances tables
>         have
>         > different schemas, i.e. instances.uuid would be
>         nullable=False in
>         > instances but nullable=True in shadow_instances.  Maybe this
>         doesn't matter.
>         No, I don't think this matters much, to be honest. I'm not
>         entirely sure
>         what the long-term purpose of the shadow tables are in Nova --
>         perhaps
>         someone could clue me in to whether the plan is to keep them
>         around?
> As I know the tables shadow_*  are used  by command ' nova-manage db
> archive_deleted_rows' , which moves  records with "deleted=True" to
> table shadow_* . That means these tables are used by other  process,
> So, I think we need other tables to store the old records in your
> migration.

Yeah, that's what I understood the shadow tables were used for, I just
didn't know what the long-term future of these tables was... curious if
there's been any discussion about that.


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