[Standards-JIG] Re: pubsub meeting 2004-06-23

Joe Hildebrand hildjj at gmail.com
Thu Jun 24 05:29:17 UTC 2004


I laid out a proposal for this here:
http://arch.jabber.com/archives/2004/04/000099.html

On Wed, 23 Jun 2004 19:05:33 -0400, Bob Wyman <bob at wyman.us> wrote:
> 
> I think the list should be extended to include a need to discuss potential
> mechanisms for optimizing s2s transmission of messages to multiple
> receivers. This was mentioned during the meeting and has been a subject of
> discussion between Peter Millard and me in the past.
> 
> The problem is this:
>         The server may discover that it needs to send the same message to
> more than one person on another server. What it wants to do is identify not
> only the recipients of a message but which subscriptions have been matched.
> The subscriptions identifiers will be different depending on the recipients
> and individual recipients may need to be notified of more than one matching
> subscription.
>         What the server would like to say is:
>         Deliver a copy to tom at example.org for his "sub1" subscription.
>         Deliver a copy to peter at example.org for his "sub3" and "sub4"
> subscriptions.
>         Deliver a copy to mary at example.org for her "332k2" subscription.
> 
>         Delivering to multiple JID's should be done using JEP-0033, however,
> JEP-0033 doesn't provide a means to transport the subscription ids. The
> subIDs can be identified using SHIM, but SHIM can't be used for addressing.
>         What may be required is to define an inter-server s2s redistribution
> or proxy protocol that provides a means of combining addressing with
> extended headers.
>         Providing this capability would be very helpful in reducing overall
> network bandwidth utilization as well as in reducing the delivery load on
> servers in the chain from pubsub service to client. Such a "fan-out"
> capability would be able to use hierarchies or meshes of servers very
> efficiently in delivering messages. If we look forward to a time when we may
> have 100's of thousands of people subscribing to pubsub services, it should
> be clear that eventually, we'll be able to save massive amounts of work for
> all parties if we can distribute the load of delivery using something like
> what is sketched above.
> 
>                 bob wyman
> 
> 
> 
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-- 
Joe Hildebrand



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