[zeromq-dev] possible for XSUB to receive a message prior to XPUB getting subscription message?

[John Muehlhausen]

It has been long enough since I worked with XPUB that I forgot all about
that!

Thank you, hopefully VERBOSE does the trick...

On Sat, Apr 9, 2016 at 2:49 AM, Doron Somech <somdoron at gmail.com> wrote:

> If verbose is set to false (default) you only get subscription the first
> time it arrives, so it might be that.
> On Apr 9, 2016 06:36, "John Muehlhausen" <jgm at jgm.org> wrote:
>
>> I have a process running zmq_poll on an XPUB socket as well as a bunch of
>> (very busy) non-zeromq fds.  zmq_init was called for '1' thread.  The
>> number and rate of XPUB outbound (published) messages is relatively low.
>>
>> I'm pretty sure I observed the subscriber getting a published message
>> well before the zmq_poll notification (on the publisher side) that the
>> subscription message could be read.
>>
>> Does this make sense?  What can go wrong on the XPUB side?  If other
>> clients have disappeared can this block reception of the next client's
>> subscription message?  Do I need to use the zmq_ctx_set method to increase
>> the priority of the zmq thread pool?  Does zmq_poll in any way prioritize
>> non-zmq fds in a way that would skip over ready zmq sockets?
>>
>> Thanks for any thoughts or tips.
>> -John
>>
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