[zeromq-dev] PAIR pattern doesn't reconnects when client restarted

Sergey Gavruk svgavruk at gmail.com
Mon Jul 8 11:27:23 CEST 2013


Hi, Pieter.

Thanks for your answer, I am just leaning zmq and trying different patterns.

I'm reading your book and later after my question I found that:

"Principally, nodes come and go whereas threads are usually static. PAIR
sockets do not automatically reconnect if the remote node goes away and
comes back." (http://zguide.zeromq.org/page:all#Node-Coordination)

It is a documented feature. And for thread sync that works okay. But I
haven't found this info anywhere except your book.


On Mon, Jul 8, 2013 at 11:52 AM, Pieter Hintjens <ph at imatix.com> wrote:

> Hi Sergey,
>
> This is a fault in the implementation of PAIR sockets, something I
> wanted to fix at some stage. As a workaround you can replace PAIR with
> DEALER and it will work as intended.
>
> -Pieter
>
> On Sun, Jul 7, 2013 at 4:38 PM, Sergey Gavruk <svgavruk at gmail.com> wrote:
> > Hello.
> >
> > If I disconnect my client in zmq (pub/sub, req/rep) and then connect
> again,
> > it will continue to receive messages. But with PAIR pattern i faced a
> > problem:
> > I am using this example
> >
> https://learning-0mq-with-pyzmq.readthedocs.org/en/latest/pyzmq/patterns/pair.html
> > and I found that if I have both client and server running, then I
> stop-start
> > server, 2 sockets will continue send and receive messages. But if I
> > stop-start client - nothing will be printed to the terminal. Messages
> will
> > not be sent and received.
> >
> > Here is my code:
> > server.py
> > http://pastebin.com/3bU93vSc
> > client.py
> > http://pastebin.com/2zdGXPCG
> >
> > So, I wonder: this is a bug or I am doing this wrong?
> > pyzmq==13.1.0
> > zeromq==3.2.3
> >
> > Thanks.
> > --
> > Best regards,
> > Sergey Gavruk
> >
> > _______________________________________________
> > zeromq-dev mailing list
> > zeromq-dev at lists.zeromq.org
> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >
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-- 
Best regards,
Sergey Gavruk
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