[nanomsg] Re: Fanout pattern
- From: "Holger Winkelmann [TP]" <hw@xxxxxxxxxxxxxx>
- To: Martin Sustrik <sustrik@xxxxxxxxxx>
- Date: Fri, 18 Jan 2013 16:37:43 +0100 (CET)
Hi Martin,
----- Original Message -----
> On 16/01/13 23:22, Holger Winkelmann wrote:
>
> > This just reminds me about subscription forwarding in nanomsg, is this
> > already available?
>
> Not yet. Still to be done.
OK, good to know....
> In any case, I would like to base it on the system implemented in
> crossroads (different subscription types: prefixes, regexps, even custom
> filtering) rather that the fixed-filtering-algorithm (prefix matching)
> as in ZeroMQ.
I agree on that.
> One thing that may be of interest to you is that in this system the
> filtering in intermediate devices (e.g. in the router) may not be
> perfect (some messages that don't match may get through the filter just
> to be filtered out at the terminal subscriber). This, in turn, allows
> for effective and memory-bounded filtering algorithms (using hash tables
> and such) suitable to be implemented in hardware.
Sounds OK. But whats the difference of the Subscriber Filter algorithm
at subscriber compared to the router? I suspect the Router need to combine
the Filter of all Subscribers which have messages passing the router? And this
will either lead to huge tables or to a algorithm which may is not perfect,
right? My question would be: has this any consequences to the behavior or is
it "just" adding some costs for the transport and bandwidth?
Thanks,
Holger
>
> Martin
>
--
Holger Winkelmann
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