Durable subscribers on durable topics don't receive messages after network
disconnect
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Key: AMQ-3353
URL: https://issues.apache.org/jira/browse/AMQ-3353
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.5.0, 5.3.1
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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