[zeromq-dev] Reliability question

Martin Sustrik sustrik at 250bpm.com
Mon Aug 2 09:55:56 CEST 2010

Steven McCoy wrote:

>     The main problem here is that with fully reliable multicast a single
>     hung up subscriber can cause hang-up of the whole system (by consuming
>     all the resources on the publisher node and thus bringing it to
>     standstill).
> I'll get OpenPGM there in a bit so it doesn't. 

Sure. The reason is that PGM is not fully reliable -- hung-up/slow 
consumer will be disconnected ultimately and thus start loosing messages.

If you think of reliability as "never loose messages" you end up with 
global standstill as a result of slow/hung-up consumer.


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