[zeromq-dev] SUB socket missing last message if it's large, RCVBUF increases help

[Pieter Hintjens]

Hi John,

Sounds like a bug; can you test against the latest libzmq master, and
create an issue in Jira, thanks?

-Pieter


On Tue, Sep 25, 2012 at 10:53 AM, Iverson, John Robert
<jrivers at sandia.gov> wrote:
> So I've run into an issue with ØMQ 2.2.0.  I'm using C++ bindings on a linux machine.
>
> Basically the last message sent from my PUB socket is never delivered to the SUB socket.  I haven't changed ZMQ_LINGER so it's still set to "forever".  It only happens on larger messages (say, 350kb), and my little repeatable program shows the issue every time.
>
> All except the very last message are delivered fine.  I'm letting the zmq::context_t be destructed (and thus zmq_term be called).
>
> If all the messages are sent by the sender before I start the receiver, the problem goes away.
>
> If I add a sleep(5) to the sender after sending the last message, the problem goes away.
>
> Increasing ZMQ_RCVBUF lets slightly larger messages to through but even-larger ones still have a problem.
>
> Example code is at http://pastebin.com/SnhqKRaa
>
> Does this sound like a bug, or am I most likely just missing something?  Thanks!
>
> Rob
>
>
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