On Sun, Apr 18, 2010 at 12:54:12PM +0200, Martin Sustrik wrote: > >The API docs don't make it clear what happens if you call zmq_connect > >multiple times on the same socket. > > Yes, you pretty much right. > > You can connect your client to multiple instances of a service: > > zmq_connect (c, "tcp://svr001.example.com:5555"); > zmq_connect (c, "tcp://svr002.example.com:5555"); > zmq_connect (c, "tcp://svr003.example.com:5555"); > > What happens is that the requests are load balanced among the servers.
I see - so rather than connecting to one of the endpoints, it connects to all of them simultaneously. Thanks. I think there's a use case for the other model too. For very large numbers of clients (N) and servers (M) it could scale better if each client picked one endpoint. Each server would only have to handle N/M connections on average. OTOH, unless there is sufficient churn in the client base, once a server has gone down and come back up again it may take a long time before it picks up its share of the load again. Churn can be forced server-side if necessary, by booting off clients after a certain number of messages or a certain amount of time. Regards, Brian. _______________________________________________ zeromq-dev mailing list zeromq-dev@lists.zeromq.org http://lists.zeromq.org/mailman/listinfo/zeromq-dev
