[Rebuild] Another issue to consider: Osmosis replication

[Ed Loach]

Frederik asked:

> Is it even possible, legally, that there is someone out there who
has
> our current database (which is licensed CC-BY-SA only), and we
> provide
> them with a diff that deletes 5% of their objects and modifies
> anohter
> 5%, and after that their database has magically become ODbL?

I think this is a key question - I'm not sure we can make that
decision for all existing consumers and they should make their own
choice. It might be possible that we can make a special diff
available to be processed manually for anyone wanting to make that
transition as an alternative to requiring a full import, so at least
they can choose which to try if they do switch. This perhaps depends
on what final process we settle on and whether it preserves ids or
not (as I believe the current favourite suggestion does).
 
> Also, if sticking to
> the
> current mode of operations is not an option, then maybe we need
> to
> rename the download directories of everything so that we can
> make sure
> that there's not a CC-BY-SA database somewhere updating itself on
> auto
> pilot with new ODbL diffs, creating all sorts of trouble for
everyone

I think this is probably necessary; I vaguely recall a number of
failing auto-updates after the last API change, some of which
weren't spotted for a while (though I may be mis-remembering).

Ed