[zeromq-dev] Publish / Subscribe vs Multicast

gonzalo diethelm gdiethelm at dcv.cl
Tue Feb 16 14:58:16 CET 2010


Gerente Desarrollo de Sistemas / CDO
Apoquindo 4001 piso 12, Santiago, Chile
+56 2 393-9073
gdiethelm at dcv.cl / www.dcv.cl


> -----Original Message-----
> From: Martin Sustrik [mailto:sustrik at 250bpm.com]
> Sent: Tuesday, 16 February, 2010 10:03
> To: gonzalo diethelm
> Cc: ellisonbg at gmail.com; zeromq-dev at lists.zeromq.org
> Subject: Re: [zeromq-dev] Publish / Subscribe vs Multicast
> 
> Hi Gonzalo,
> 
> > Martin, all I see in the attached PNG is seven white squares on a
black
> > background, with no other markings.
> 
> It corresponds to the diagram in butterfly example that I've linked
you
> to originally:
> 
> http://www.zeromq.org/tutorials:butterfly#toc7
> 
> > Yesterday, driving home, I convinced myself that what I am doing is
not
> > going to work (which probably means that I will have to convince
myself
> > later that I was wrong about it not working...). Anyway, from what I
> > know about TCP/IP, you can bind only one socket to a given IP
address /
> > port, right? Therefore, how would it be possible to have several
> > instances of component1, all bound to the same endpoint, running at
the
> > same time?
> 
> That's what 0MQ does for you. Single 0MQ socket handles arbitrary
number
> of unerlying TCP sockets.
> 
> > Furthermore, let's say this multiple binding is made possible by
zmq.
> > When send_requests sends a request, how will it know there are two,
> > three or N instances of component1, all bound to the same
destination
> > endpoint, so that send_requests will round-robin between them?
> 
> It knows because component1 instances connects to send_requests.
> 
> Maybe reading the article published recently at LWN would help you to
> get soume background?
> 
> http://lwn.net/Articles/370307/
> 
> Martin


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