[Rebuild] Another issue to consider: Osmosis replication

[Michael Collinson]

On 17/02/2012 11:36, Ed Loach wrote:
> 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
>>      
Specifically and only on the issue of anyone wanting to maintain a 
continuing CC-BY-SA database:

Are there not two issues here? One is the technical rebuild which makes 
the database ODbL licensABLE, (but not necessarily ODbL licensED).  The 
other is the point at which which we say " the database is now 
distributed under ODbL" and someone then adds a new node that cannot 
distributed under CC-BY-SA. Anyone wanting to maintain a continuing 
CC-BY-SA database would be highly unlikely to want to receive our 
rebuilds and cannot receive diffs going forward without tainting their 
own db. So, is not the solution simply to give fair notice that when our 
db goes down for rebuild, we advise that they permanently shut down diffs?

Mike