Code review comment for lp:~rconradharris/nova/backup_schedule_extension

> The problem as it stand now, though, is that Nova doesn't really have a notion
> of a completely optional extension. As Nova goes to production and we start
> integrating it with more and more custom systems, I think we're going to need
> to really think hard about how to do Nova extensions right, from a packaging,
> unit-test, and virt/compute/api layer perspective.
>
> Perhaps we can get this discussion started at the Essex design summit?

Yes, definitely :) You're absolutely right that Nova doesn't currently support completely optional extensions. That's the root of the problems.

-jay