[zeromq-dev] Any way to get info on subscribers?

[Brian Granger]

On Sat, Jul 24, 2010 at 6:06 AM, Pieter Hintjens <ph at imatix.com> wrote:
> Yes, we already know that we need heartbeating for any health monitoring
> scenario.

As an aside we have been able to implement request/reply heartbeats
using the standard 0MQ devices with great success.  Basically new code
is required.  You just have to pick the right device and socket types.

Cheers,

Brian

> -Pieter
>
> Sent from my Android mobile phone.
>
> On Jul 24, 2010 2:21 PM, "Martin Lucina" <mato at kotelna.sk> wrote:
>
> ph at imatix.com said:
>> Knowing the number of subscribers also lets a publisher take votes, e.g.
>> to
>> ...
>
> The mere *presence* of a TCP connection to a peer does not indicate that
> peer is active in any way.
>
> Therefore, assuming the naive case where the underlying transport is
> exclusively TCP, and you have a PUB socket with X SUBs connected to it,
> implementing a 0MQ socket option to return X on the PUB side would in no
> way help you with "detecting network failures".
>
> It may of course help you to do "other fun things" :-)
>
> -mato
>
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-- 
Brian E. Granger, Ph.D.
Assistant Professor of Physics
Cal Poly State University, San Luis Obispo
bgranger at calpoly.edu
ellisonbg at gmail.com