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From "Mike Forrest (JIRA)" <>
Subject [jira] Created: (AMQ-1661) Duplicate messages and extra network traffic with duplex connections
Date Thu, 10 Apr 2008 20:21:43 GMT
Duplicate messages and extra network traffic with duplex connections

                 Key: AMQ-1661
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker, Connector
    Affects Versions: 5.1.0
            Reporter: Mike Forrest
         Attachments: duplex.png

(see attached diagram)

I have two brokers A and B, where A establishes a connection to B with the options: 
duplex="true" networkTTL="3" dynamicOnly="true" 

I have two clients connecting to broker A, and one to B.  One of the clients on A is subscribing
to a queue, the other is publishing to it.  The client on B is not using that queue at all.
 When the publishing client sends a message, the subscriber receives it as expected.  But
if I watch the network with a sniffer, I can see the message being sent to broker B and back

I also set up a topic that all of the clients subscribe to.  If a client on A sends a message
to the topic, the client on B receives it normally, but the two clients on A receive the message
twice.  I can see with the sniffer that the message is being sent from A to B and back. 

If I change the connection so that it's not duplex (i.e. I set up matching simplex connections
on both brokers) all of this unexpected behavior goes away.  In the first example, the messages
are no longer forwarded to B since there are no subscribers on that broker.  In the second
example, the message is received once by every subscriber. 

I have tested on various 5.1 snapshots up through 4/8/08.

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