[zeromq-dev] zmq_msg_send blocks reading from zmq::mailbox_t

[Marcin Romaszewicz]

Send timeouts, using ZMQ_NOBLOCK both fix the problem. The mandatory option
has no effect.

On Thu, Jul 2, 2015 at 11:53 AM, Pieter Hintjens <ph at imatix.com> wrote:

> Could be new code in 4.x misbehaving. Try setting a send timeout,
> and/or not using the mandatory option, maybe.
>
> On Thu, Jul 2, 2015 at 8:19 PM, Marcin Romaszewicz <marcin at brkt.com>
> wrote:
> >
> >
> > On Thu, Jul 2, 2015 at 11:16 AM, Pieter Hintjens <ph at imatix.com> wrote:
> >>
> >> Can you make a minimal test case?
> >>
> >
> > I'm trying, yes, but so far, no luck. Our zmq-based message routers are
> > complex and have many sockets in many states at any given time, and this
> > only happens after some amount of communication has already happened.
> I'll
> > post the minimal test case here if I can come up with one.
> >
> >>
> >> On Thu, Jul 2, 2015 at 2:12 AM, Marcin Romaszewicz <marcin at brkt.com>
> >> wrote:
> >> > Hi Guys,
> >> >
> >> > We had our prod systems running on 3.2.4, and to work around some file
> >> > descriptor leaks, I'm testing 4.1.2 before back-porting jbreams'
> >> > heartbeats
> >> > patch, and testing unmodified 4.1.2 is failing for me in production.
> >> >
> >> > I've got ZMQ_ROUTER sockets wedged in zmq_msg_send, spinning in a
> while
> >> > (True) loop calling recv() on mailbox in zmq::socket_base_t::send().
> >> >
> >> > Before I start chasing the cause of this, is there a known mistake on
> my
> >> > part which could cause this?
> >> >
> >> > The socket is a ZMQ_ROUTER, with all settings at default except for
> >> > ZMQ_LINGER=0 and ZMQ_ROUTER_MANDATORY=1
> >> >
> >> > I'm pretty sure I'm sending stuff to a dead peer, but not 100% certain
> >> > yet.
> >> >
> >> > Any tips on what I should be looking for to diagnose this? The same
> >> > code,
> >> > unmodified, doesn't have this issue against zmq 3.2.4.
> >> >
> >> > Thanks,
> >> > -- Marcin
> >> >
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> >> >
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