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From "Andreas Calvo (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (AMQ-3353) Durable subscribers on durable topics don't receive messages after network disconnect
Date Wed, 13 Jun 2012 10:39:44 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294334#comment-13294334
] 

Andreas Calvo edited comment on AMQ-3353 at 6/13/12 10:39 AM:
--------------------------------------------------------------

To discard a bad implementation of the process, I've reproduced the problem using the examples
provided in the stable release.
I've had to modify the java code for both the ConsumerTool and ProducerTool to add a string
property with the sender string.
I am reusing the producerClientId parameter to set the sender name.
The file example.tar.gz contains the example directory from ActiveMQ-5.6 stable release with
the modified files.

The instructions.txt contains a detailed description of the process used.
                
      was (Author: acalvo):
    To discard a bad implementation of the process, I've reproduced the problem using the
examples provided in the stable release.
I've had to modify the java code for both the ConsumerTool and ProducerTool to add a string
property with the sender string.
I am reusing the producerClientId parameter to set the sender name.

The instructions.txt contains a detailed description of the process used.
                  
> 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, TEST-org.apache.activemq.usecases.DurableSubscriberWithNetworkDisconnectTest.xml,
TEST-org.apache.activemq.usecases.DurableSubscriberWithNetworkDisconnectTest.xml, embedded1.xml,
embedded2.xml, example.tar.gz, instructions.txt, standalone1.xml, standalone2.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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