[zeromq-dev] "Broadcast" messages for PUSH-PULL sockets?

[Andrew Hume]

i use the scheme of having the workers report status back via a PUSH-PULL to the
source (or control process). then pump down no-op data until all workers report no-ops.

On Mar 14, 2011, at 8:10 AM, Timothy Shead wrote:

> When streaming a fixed quantity of data through a pipeline via PUSH-PULL 
> sockets, I find myself wanting to signal all of the downstream workers 
> when the input data has been exhausted.  To do that, I have to send my 
> "finished" message multiple times, which means that each upstream PUSHer 
> must be explicitly configured to know how many downstream PULLers there 
> will be, which spreads-around knowledge of the pipeline topology and 
> introduces lots of complexity, e.g. waiting for every PULLer to connect, 
> etc.  Is there an easier way to "broadcast" a message to every PULL 
> socket connected to a PUSH?  Using a separate PUB-SUB connection seems 
> equally problematic - I'm assuming that there's no guarantee that a 
> published "finished" message would arrive after the last data message in 
> the PUSH-PULL connection.
> 
> Thanks in advance,
> Tim
> 
> -- 
> Timothy M. Shead
> Sandia National Laboratories
> 1461, Scalable Analysis and Visualization
> 
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------------------
Andrew Hume  (best -> Telework) +1 623-551-2845
andrew at research.att.com  (Work) +1 973-236-2014
AT&T Labs - Research; member of USENIX and LOPSA




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