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https://issues.apache.org/jira/browse/AMQ-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587208#comment-13587208
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Gary Tully commented on AMQ-3353:
---------------------------------
There is a test case that simulates a very flaky network by randomly closing
the socket locally. It uses a tcpfaulty://.. transport.
see: org.apache.activemq.usecases.MulticastDiscoveryOnFaultyNetworkTest
Maybe you can use some variant of that to reproduce in a unit test.
When the network cable is unpluged, there is a delay in getting socket feedback
that depends on the tcp stack settings for timeouts and retries. So from a java
app perspective, connections that are half closed can appear valid for some
period. Whatever the case, the broker should be able to deal with it though,
and once the tcp stack reports the real state of the network, things should
come back to normal.
> Durable subscribers on durable topics don't receive messages after network
> disconnect
> -------------------------------------------------------------------------------------
>
> Key: AMQ-3353
> URL: https://issues.apache.org/jira/browse/AMQ-3353
> 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
> Assignee: Gary Tully
> Fix For: 5.6.0
>
> Attachments: DurableSubscriberWithNetworkDisconnectTest.java,
> DurableSubscriberWithNetworkDisconnectTest.java,
> DurableSubscriberWithNetworkDisconnectTest.java, embedded1.xml,
> embedded2.xml, example.tar.gz, instructions.txt, standalone1.xml,
> standalone2.xml,
> TEST-org.apache.activemq.usecases.DurableSubscriberWithNetworkDisconnectTest.xml,
>
> TEST-org.apache.activemq.usecases.DurableSubscriberWithNetworkDisconnectTest.xml,
> test-results.ods
>
>
> 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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