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From spiiff <matthias.ba...@siemens.com>
Subject Re: receiving old messages when restartin embedded broker - problem with persistence/auto_acknowledge?
Date Wed, 24 Oct 2007 13:28:41 GMT

We solved the problem.
I debugged the activeMq code and somewhere deep in the "DefaultJDBCAdapter"
I found a batchedStatements boolean. When I insert the following snippet in
the activemq.xml 
the boolean is set to false and all statements are correctly persisted:

  <bean id="db-adapter"
class="org.apache.activemq.store.jdbc.adapter.DefaultJDBCAdapter"> 
    <property name="batchStatments" value="false" /> 
  </bean>  

Of course, in your persistence adapter you have to reference the db-adapter
bean:

    <persistenceAdapter>
      <journaledJDBC journalLogFiles="5" dataDirectory="../activemq-data"
createTablesOnStartup="true" dataSource="#oracle-ds" adapter="#db-adapter"
/>
    </persistenceAdapter>     


I don't exactly know the effect of turning off batched statements, but for
my testing it is Ok at the moment. Maybe we have lost some performance now..
When we really start to use activeMQ in our system I'll have to investigate
further ..



krv wrote:
> 
> I had encountered the same problem. I had a sender and a receiver which
> were running on Tomcat server. Whenever I restarted the receiver I used to
> get all the messages that I had earlier to the message broker and which
> had been processed.
> 
> The only difference my code has than your code was that I am using a
> MessageListener.onMessage(Message) rather than Consumer.receive().
> 
> After some investigation I found out that  my code had caused the problem.
> When I had called a method in my code it encountered some exception and
> the control never returned to the MessageListener (the receiver) and hence
> the ActiveMQ session never got committed. And hence the message was never
> dequed from the queue.
> 
> I am not sure if your problem is the same, but you can try the following:
>   * Commit the session just after you receive the message
>   * Acknowledge the message: message.acknowledge()
> 
> Let me know how it goes.
> 
> 
> spiiff wrote:
>> 
>> Hello,
>> we are facing a strange problem.
>> I am running an embedded broker in my unit test:
>> 
>> 		URI activemqConfigurationUri = new URI("xbean:conf/activemq.xml");        
>> 	    	brokerService = 		    		 
>> 	    		BrokerFactory.createBroker(activemqConfigurationUri);	    	
>> 	    	brokerService.start();
>> 
>> 
>> I have 2 connections/sessions, from every session I create a customer to
>> a topic:
>> 
>> 		connection1 = connectionFactory.createConnection();
>> 		connection1.setClientID("1stID");	        
>> 		connection1.start();	        
>> 		session1 = connection1.createSession(false,Session.AUTO_ACKNOWLEDGE);	      
>> 		MessageConsumer consumer1 = ((TopicSession)
>> session1).createDurableSubscriber((Topic) destination, subscriberName);
>> 
>>  			
>> 	             connection2 = connectionFactory.createConnection();
>> 		connection2.setClientID("2ndID");	        
>> 		connection2.start();
>> 		session2 = connection2.createSession(false,Session.AUTO_ACKNOWLEDGE);
>> 		MessageConsumer consumer2 = ((TopicSession)
>> session2).createDurableSubscriber(
>> 		  (Topic) destination, subscriberName);
>> 
>> 
>> From a third session I create a producer and send 2 messages to the
>> topic:
>> 
>> 		producerConnection = connectionFactory.createConnection();
>> 	             producerConnection.setClientID("producer");
>> 	             producerConnection.start();	        
>> 		producerSession =
>> producerConnection.createSession(false,Session.AUTO_ACKNOWLEDGE);
>> 
>> 		producer = producerSession.createProducer(destination);
>>                          
>> producer.setDeliveryMode(DeliveryMode.PERSISTENT);
>>                           producer.setTimeToLive(300000);   
>> 
>> 
>> 		javax.jms.Message msg1 = producerSession.createObjectMessage(message1);
>> 		javax.jms.Message msg2 = producerSession.createObjectMessage(message2);			
>> 		producer.send(msg1,DeliveryMode.PERSISTENT , Message.DEFAULT_PRIORITY,
>>                 Message.DEFAULT_TIME_TO_LIVE);
>> 		producer.send(msg2,DeliveryMode.PERSISTENT , Message.DEFAULT_PRIORITY,
>> 	              Message.DEFAULT_TIME_TO_LIVE);
>> 
>> 
>> Then I receive the 2 messages with my consumers (every consumer is
>> receiving 2 messages):
>> 
>> 		Message msg1 = consumer1.receive(3000);
>>     	             while(msg1!=null){
>> 	    		Object object = ((ObjectMessage)msg1).getObject();	    		
>> 	    		msg1 = consumer1.receive(3000);
>> 		}
>> 
>> 		Message msg2 = consumer2.receive(3000);
>>     	             while(msg2!=null){
>> 	    		Object object = ((ObjectMessage)msg2).getObject();
>> 	    		msg2 = consumer2.receive(3000);
>>     	             }
>> 
>> 
>> 
>> I close the consumers:
>> 
>> 		consumer1.close();
>> 		consumer2.close();
>> 
>> And again I send 2 messages.
>> I close all connections and the embedded broker.
>> The next time I run the unittest the first consumer gets 4 messages, as
>> expected.
>> The second consumer gets 6 messages! It gets all messages that were
>> produced, all the time.
>> We're using activemq 4.1.1 
>> 
>> When we are not running an embedded broker but an standalone broker, a
>> separate process, everything 
>> is Ok as long we don't stop and restart the broker. After restarting the
>> second consumer again receives all the messages 
>> the first time it calls consumer.receive(). Then the second time it
>> receives 4 messages.
>> I guess there is something wrong with the persistence to the database.
>> When we're using our oracle I can query ACTIVMQ_ACKS.
>> There my 2 CLIENT_IDs are listed. And the LAST_ACKED_ID only changes for
>> one of the CLIENT_IDs.
>> 
>> Can anybody help me?
>> 
>> I didn't find the same problem in the forum, only alike problems:
>> http://www.nabble.com/-activemq-user--Re%3A-receiving-old-messages-again-after-restart-tf95738s2354.html#a265691
>> 
>> Regards,
>> Matthias
>> 
>> 
> 
> 

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