[messaging] Minimal requirements for group chat

[Michael Rogers]

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On 16/04/14 20:24, Kurt Roeckx wrote:
> On Wed, Apr 16, 2014 at 04:36:07PM +0100, Michael Rogers wrote:
>> * All members agree about the order of the messages in the chat
> 
> How important is this goal?  It might be make things simpler if 
> this wasn't a hard requirement.

I'm open to the idea of relaxing the goals to make the problem
tractable, but I think we'll need some kind of ordering restrictions -
otherwise a member could mess with other members' interpretations of
the conversation by causing different members to see different orderings.

> So the first question I really have, is this 1 master acceptable, 
> or do you need a multi master solution?
> 
> If you go with 1 master, you can just have that one decide what the
> order is, and hand out ids if needed.
> 
> If you're going for multi master, things might get more 
> complicated, and I'm not sure it's needed.

Interesting idea... if we had a single master choosing the order,
could we prevent the master from showing different orders to different
members?

Cheers,
Michael
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