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From "Joe Shisei Niski (JIRA)" <>
Subject [jira] [Commented] (AMQ-3353) Durable subscribers on durable topics don't receive messages after network disconnect
Date Thu, 23 Jun 2011 16:07:47 GMT


Joe Shisei Niski commented on AMQ-3353:

i also have this problem on AMQ 5.3.2 (in production), and in our AMQ 5.4.2 test environment.

We have a store & forward network of brokers, much like the back-office/retail store example
in ActiveMQ in Action. i use a duplexed networkConnector on the subscribers, with durable
topic subscriptions. Queues and topics are defined as <dynamicallyIncludedDestinations>
in the <networkConnector> configuration.

After a disconnect, i can see the brokers reconnecting in both the publisher's and subscribers'
logs. Also, the AMQ web console on the publisher continues to show the durable ssubscriptions
as on-line. But topic messages published during/after the outage aren't picked up unless i
restart the subscriber broker.

Furthermore, queue messages *do* flow successfully between the two brokers after the reconnect.

i've added "keepAlive=true" and "useExponentialBackoff=false" to the URIs for my openwire
and ssl transportConnectors, but neither setting has made any difference in the problem behavior.

Our current work-around is to monitor the message counts on publisher's and subscriber's topics,
send an alert to our sysadmin team when they get out of synch, and manually restart the subscriber.

It's a relief to know that i'm not the only one...

> Durable subscribers on durable topics don't receive messages after network disconnect
> -------------------------------------------------------------------------------------
>                 Key: AMQ-3353
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.1, 5.5.0
>         Environment: Windows & Linux
> JDK 1.6
>            Reporter: Syed Faraz Ali
> I've set up a durable topic with the default (persistent) delivery mode on one machine
that is publishing a simple text message every 5 seconds. I created a durable subscriber that
consumes messages published to the above topic on another machine. I am using broker to broker
communication between the two machines.
> I start up the two programs on either machine and see the messages coming through to
the subscriber. If I then pull the network cable to disconnect the network between the two
machines, wait for a minute and then plug it back in, my subscriber doesn't receive the messages
any more. I can see from the output that the publisher is still publishing them (Temporary
topics, non-durable queues all continue to sync up in our production environment, it is only
the durable topics that don't work after network reconnect)
> If I were to tweak a setting on the publisher's broker (that was introduced only in 5.5.0),
suppressDuplicateTopicSubscriptions=false, then the topics work correctly after network reconnect.
But this may have other unintended consequences and I was hoping to get a better idea of:
> - is this a known issue ? if so, then are there any specific challenges that have caused
it not to be fixed?
> - are other people out there using durable topics and subscribers without a failover
option that have run into this problem? What have they done to work around?
> Here is how my subscriber and publisher are set up:
> Topic Publisher (Machine 1)
>         publisherConnection = connFactory.createConnection();
>         publisherConnection.setClientID( "ProducerCliID" );
>         publisherConnection.start();
>         session = publisherConnection.createSession( true, -1 );
>         Destination producerTopic = session.createTopic( TEST_TOPIC_NAME );
>         producer = session.createProducer( (Topic)producerTopic );
> ....
> ....
> ....
>     // On a timer, keep sending this out every 5 seconds
>                  String text = "HELLO " + count++;
>                 TextMessage msg = session.createTextMessage( text );
>                 System.out.println( "Sending TextMessage = " + msg.getText() );
>                 producer.send( msg );
>                 session.commit();
> Subscriber ( Machine 2):
>         Connection clientConnection = connFactory.createConnection();
>         clientConnection.setClientID("cliID");
>         clientConnection.start();
>         Session session = clientConnection.createSession( false, Session.AUTO_ACKNOWLEDGE
>         Destination topic = session.createTopic( topicName );
>         MessageConsumer subscriber = session.createDurableSubscriber( (Topic)topic, "subName"
>         TestMessageListener msgListener = new TestMessageListener( 1000 );
>         subscriber.setMessageListener( msgListener );
> .....
> .....
>          // TestMessageListener's onMessage method simply outputs the message:
>         public void onMessage(Message message)
>         {
>             if ( message instanceof TextMessage )
>             {
>                 System.out.println( "Message received = " + ((TextMessage)message) );
>             }
>         }
> I can provide the jars for you to run the program if need be.

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