[zeromq-dev] Knowing when a client is full

Martin Sustrik sustrik at 250bpm.com
Mon Sep 26 12:12:09 CEST 2011

On 09/23/2011 09:24 AM, Andrew Davey wrote:

> Our concern is what happens when one of our Clients is unable to
> receive their messages. We can't decide if the documentation is saying
> that ZMQ_ROUTER sockets only drop when the HWM is reached for all
> peers or if messages are dropped if just one peer/Client has reached
> the HWM. Could someone clarify?

It's per peer. Each underlying connection has its own buffer and its own 

> Secondly, is there a better way to achieve our goals? Ideally we would
> like a Worker to be able to determine if a Client has reached a HWM
> and then register a callback to be called once things are good again.
> Failing callbacks, the ability to poll a Client that it's good would
> be great.

This can't be done with existing ROUTER socket unfortunately. There's a 
new design of ROUTER socket in the development trunk that would allow 
for that kind of thing but it would have to be backported to the stable 
versions of 0MQ.


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