[zeromq-dev] PUB-SUB filtering question

Martin Sustrik sustrik at 250bpm.com
Fri Aug 13 22:20:15 CEST 2010


> With pub-sub sockets, does the message filtering take place on the 
> subscriber's side or the publisher's side? In other words, does each 
> subscriber get all messages across the network and filter them locally, 
> or does the publisher only send to each subscriber the topics they are 
> subscribed to? This difference seems significant if there is a high 
> volume of traffic coming from the PUB.

As for now, it's done on subscribers side. See the ongoing thread about 
migration of the filtering to the publisher.

> Also, am I correct in assuming that you are not limited to ascii 
> character message topics? ie, can I subscribe to messages starting with 
> the 4 non-printable characters 0xDE 0xAD 0xBE 0xEF?

Yes. It's binary.


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