[zeromq-dev] PUB doesn't discard msg when no SUB

[Li, Jia]

Hi,

I have multiple PUB sockets and single SUB socket.  The PUBs perform
connect() and the SUB performs bind().

The problem I see is that if the SUB starts after the PUBs, it still
receive all the messages sent before. This seems to contradict to what
the documentation said.

However, if I have only one PUB and one SUB, and I reverse the
connect/bind by having PUB bind() and SUB connect(), I get the
documented behavior in which SUB doesn't receive historical messages.

Here are the code:

SUB
-------
import zmq

context = zmq.Context()
sub = context.socket(zmq.SUB)
sub.setsockopt(zmq.SUBSCRIBE, "")
sub.bind("tcp://127.0.0.1:27888")

while(1):
    msg = sub.recv()
    print msg



PUB
-------
import zmq, time
from datetime import datetime

context = zmq.Context()
pub = context.socket(zmq.PUB)
pub.connect("tcp://127.0.0.1:27888")

while(1):
    msg = datetime.now().strftime('%H:%M:%S.%f')
    print msg
    pub.send(msg)
    time.sleep(1)


Regards,
Jia

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