[zeromq-dev] Lost message with PUSH/PULL

Doron Somech somdoron at gmail.com
Fri Jul 1 18:21:33 CEST 2016


So it is a confirmed bug, solving it might be complicated. I will take a
look tomorrow.

On Fri, Jul 1, 2016 at 5:53 PM, KIU Shueng Chuan <nixchuan at gmail.com> wrote:

> I have attached some minimal code here where doing a TCP connect to
> the PUSH bind socket makes the latter writable.
>
> Tested on 4.1.4
>
> On 30 June 2016 at 23:11, Doron Somech <somdoron at gmail.com> wrote:
> > I think it might be the ZeroMQ behavior (which is probably a bug), once
> the
> > connection is open ZeroMQ start to queue messages for the connection,
> even
> > if handshake is not yet completed, so when you do telnet the message is
> not
> > discarded but queue for the telnet connection.
> >
> > I think only PUSH is affected by this behavior, also fixing it might be
> > hard, it also might be security issue, right now PUSH socket type is not
> > safe for internet use because of this.
> >
> > If you can I suggest you reverse the bind/connection so PUSH will connect
> > and PULL will bind. If not an option try to use ROUTER instead and have
> some
> > kind of handshake.
> >
> > Nice catch, I still want to make sure that is really what happen and see
> if
> > it possible to fix this easily..
> >
> > On Thu, Jun 30, 2016 at 11:32 AM, 王运来 <hnwyllmm at 126.com> wrote:
> >>
> >> Hi every guys:
> >>        I got a problem which ZMQ will lost some messages with PUSH/PULL
> >> ZMQ socket.
> >>        The scene like this:
> >>        A: PUSH socket, bind address "tcp://*.1209"
> >>        B: PULL socket, connect to "tcp://localhost:1209"
> >>
> >>        Run the command "telnet localhost 1209" while A sending message
> to
> >> B.
> >>
> >>        The result is B will miss  messages even if I set the option of
> >> ZMQ_IMMEDIATE to 1 like this:
> >>            int immediate = 1;
> >>    zmq_setsockopt(pSock, ZMQ_IMMEDIATE, &immediate, sizeof(immediate));
> >>
> >>       Is it right in this scene or is it should be?
> >>
> >>
> >>
> >>
> >>
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> >
> >
> >
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