[zeromq-dev] best way to guarantee delivery of large message and to be warned of network issues?

Pieter Hintjens ph at imatix.com
Tue Sep 23 12:48:31 CEST 2014

Please read the Guide and follow the examples, and learn how the
ZeroMQ semantics work.

On Tue, Sep 23, 2014 at 4:19 AM, Kenton Garner <kenton.garner at gmail.com> wrote:
> I am using jeroMQ and starting to like it, but...
> For the life of me,  I can not get past the abstraction from the socket
> layer.
> 1.) The lack of feedback on socket issues is worrisome.  I have added a
> second thread just to ping(pong) the server to insure that the connection is
> kept alive, but without some feedback when do I know whether to cycle the
> connections?   I see  that it does throw some unchecked exceptions (why
> unchecked - what a pain in the ass) - but I have never seen any thrown no
> matter what I do to the server or connection.
> 2) When I have a large message to transfer and it takes a while, I have no
> alternative but to put a huge timeout value on the poll before returning.
> This means that I may wait a couple minutes for a tiny message ( when the
> server is not running ) just so I can be sure that my large messages have a
> sufficient timeout value.  I have acknowledgment messages returning so I
> know if it was received, but it is not acceptable to block on the recv()
> call because zeromq does not warn me if there are any socket issues ( has
> not so far ).  I could block for ever without a clue.
> I understand that when I send a message it is just put on an internal queue
> and then sent later, however in my case, I would prefer not to queue.  I
> want to block on the send until the data is actually sent, then I can have a
> reasonable time-out waiting for the server to respond.
> 3.) Do the smoke and mirrors behind the zmq_proxy() handle cycling
> connection if necessary - or does it just die?
> Thanks for any help I would appreciate it.
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