[zeromq-dev] Discard old messages on XPUB before transmission

[Cem Karan]

On Jul 18, 2013, at 7:07 PM, Steven McCoy wrote:

> On 18 July 2013 16:12, Diego Duclos <diego.duclos at gmail.com> wrote:
>> I would have use for some of this stuff as well.
>> However, I don't think it really feels at home in zmq itself ? What about a middleware layer between zmq and user apps that takes care of this ?
> 
> 
> There is a cost on the send side, you would probably want to implement a watermark a factor of the network latency and desired lifetime and still gain some benefit from network batching.
> 
> It is technically feasible with PGM to kill the messages in the transmit window such that NAKs will be denied and late joiners will not ask for them.

I second Steve; this is something that is best inside of ZMQ as ZMQ really knows when it is about to send a message out. 

Killing the messages in the transmit window is EXACTLY what I was thinking about!  Steve, would this be easy to implement in OpenPGM?  I'm willing to look at this, but since I don't know the codebase, I'm not sure where to start.

Thanks,
Cem Karan
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