[erlang-questions] Distributed publish/subscribe system

[Brian Candler]

On Tue, Jan 25, 2011 at 10:00:56AM -0500, Kaiduan Xie wrote:
> 1) The system should be able to support tens to hundreds of millions
> users spreading around the world, so the system will consist hundred
> of nodes located in different physical locations.
> 
> 2) Any user can subscribe to the interested topic, but only topic
> owner can publish message to the group. We have no limit on the number
> of subscribers in each group. It can be huge, for example, the fans of
> Rolling Stone around the world.
> 
> 3) The number of topics/groups in the system is unlimited.
> 
> 4) User is not always connected to the system, not always connected to
> the same node in the system, and the message delivery should be
> guaranteed.
> 
> 5) As to the latency, it should be in the range of 1 minute if
> subscriber is connected.

Sounds like NNTP to me!