[zeromq-dev] PUB SUB in zmq 2.1.11

[Doherty, Kevin]

So the scenario is this I think

The SUB   subscribes to say "order"
The pub does a pair of sends as shown.
p.send (topic, ZMQ.SNDMORE);
p.send (data, 0);
The SUB which is doing a pair of recv(0)s, one for the "order" in the topic header of the two part message
and a second for the data,  entirely misses the first message sent.

Now if the subscription is for 'everything"
Ie.an empty byte, the behavior is a bit different.
The header (first part)  is "lost" and then all subsequent "parts" are received.
This throws things off thereafter of course by the amount of the one  "missed" part.
As opposed to the entire first message when there is an actual subscription filter string.

tx


From: zeromq-dev-bounces at lists.zeromq.org [mailto:zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Joshua Foster
Sent: Wednesday, March 21, 2012 9:29 AM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] PUB SUB in zmq 2.1.11

I suspect this is caused by the time required to try reconnecting (it gets progressively longer). Don't put a sleep between the connect and bind, just before the sending first message.

Joshua


On Mar 21, 2012, at 6:56 AM, Doherty, Kevin wrote:



Folks,
       I'm new to the mail list. Has there been any report of an issue with  zmq 2.1.11 where the first message
is lost in a pub-sub  arrangement *but* Not because of the slow  subscriber.

Ie.
when I send my first message it seems to not get delivered Despite a *very* long delay between the following steps.
connect in the sub  - bind in the pub - send first message from the pub
Same issue if I
Bind in pub - connect in sub - send first message from pub
With long delays between all of the above ?

Tx++



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