Artem, This is a problem that every network developer faces. Did my message make it to its destination? If I send a message, is it likely to make it to the recipient?
Fortunately, there are patterns to use to increase reliability, but even then there is no way to be 100% sure that when a message is sent, it will flow across the infrastructure and be delivered with 100% certainty without an acknowledgement. You cannot _instantly_ get an indication a server failed — or the associated infrastructure — unless you have a steady stream of bytes going across the wire, and they suddenly stop. If you want to know a node went down, you will need heartbeat messages. There are a few ways to do this. Please look at the paranoid pirate example and this: http://zguide.zeromq.org/page:all#Heartbeating -- Justin Cook On Wednesday, 11 December 2013 at 09:59, artemv zmq wrote: > Okay. Thanks for your thoughts. Again, I read the guide, and I know on > practice what's pub/sub/push/pull/ .. and so on. > > But let me ask one more time very concrete and simple question. I want to > develop a client/server appl. Okay. I pick dealer/router pattern. Fine. Now > my requirement is following: > if server is unaccessible (wrong ip address, server is not online, server was > online and then went offline, etc.) -- in this case I want to get > (_instantly_) some indication that client can't send a message because server > is unaccessible. It's clear? Again, I don't want to await for reply, I want > to know right now that I can't send a message. > > Realistically, this is very classic networking issue :) So, how can ZMQ help > me? Or is it possible/eligible et al to implement transactional (not > batching!) applications on ZMQ? > > > BR > -artemv > > > > > > > 2013/12/11 Bruno D. Rodrigues <bruno.rodrig...@litux.org > (mailto:bruno.rodrig...@litux.org)> > > zeromq.org (http://zeromq.org) - learn the basics - > > http://zeromq.org/intro:read-the-manual - the guide - > > http://zguide.zeromq.org/page:all > > > > I just gave you a short description of how Ømq is solving the network > > problems for me. > > > > On Dec 11, 2013, at 6:59, asif saeed <asif.l...@gmail.com > > (mailto:asif.l...@gmail.com)> wrote: > > > Hi Bruno, > > > > > > On Wed, Dec 11, 2013 at 12:38 AM, Bruno D. Rodrigues > > > <bruno.rodrig...@litux.org (mailto:bruno.rodrig...@litux.org)> wrote: > > > > Xsub xpub for distribution load balancing > > > > > > > > > What is Xsub xpub? Could you please explain these terms or give me a link > > > to an online resource where these terms are explained in detail? > > > > > > Thanks in advance, > > > -Asif > > > > > > > > > > > > > > > > > > _______________________________________________ > > > zeromq-dev mailing list > > > zeromq-dev@lists.zeromq.org (mailto:zeromq-dev@lists.zeromq.org) > > > http://lists.zeromq.org/mailman/listinfo/zeromq-dev > > > > > > > > _______________________________________________ > > zeromq-dev mailing list > > zeromq-dev@lists.zeromq.org (mailto:zeromq-dev@lists.zeromq.org) > > http://lists.zeromq.org/mailman/listinfo/zeromq-dev > > > _______________________________________________ > zeromq-dev mailing list > zeromq-dev@lists.zeromq.org (mailto:zeromq-dev@lists.zeromq.org) > http://lists.zeromq.org/mailman/listinfo/zeromq-dev _______________________________________________ zeromq-dev mailing list zeromq-dev@lists.zeromq.org http://lists.zeromq.org/mailman/listinfo/zeromq-dev
