Another observation is:
If I comment Thread.sleep(1000); the error does not appear. Everything works
fine.
I have 3 command prompts: 1 running the broker, another TopicPublisher & 3rd
TopicListener.
My PC is having 2GB of memory & I am currently not running many
applications.
James.Strachan wrote:
>
> The broker is a separate process to the slow consumer right?
>
> 2008/9/16 Badri <[EMAIL PROTECTED]>:
>>
>> Hi
>>
>> I am trying to simulate slow consumer using the classes
>> (TopicPublisher/TopicListener) provided in examples.
>>
>> I wanted to see if Web Console prints the Advisory topic for Slow
>> Consumer.
>> But I am facing Out Of Memory Error & the consumer stops abruptly.
>>
>> Following are changes I did:
>>
>> activemq.xml:
>>
>> <transportConnectors>
>> <transportConnector name="openwire"
>> uri="tcp://localhost:61616?maxInactivityDuration=-1"/>
>> </transportConnectors>
>>
>>
>> TopicListener: I added a sleep of 1000 to induce some slowness.
>> if (++count % 1000 == 0) {
>> System.out.println("Received " + count + " messages.");
>> try
>> {
>> Thread.sleep(1000);
>> }
>> catch (Exception e)
>> {
>>
>> }
>> }
>>
>> I give java -Xmx256m -Xms128m when using TopicListener.
>> After maybe 5 minutes it crashes. After receiving anywhere between 15-20
>> batches of 1000 messages, it crashes.
>>
>> Exception:
>> Received 9000 messages.
>> Received 10000 messages.
>> javax.jms.JMSException: Unexpected error occured
>> at
>> org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSuppo
>> rt.java:62)
>> at
>> org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnect
>> ion.java:1255)
>> at
>> org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1659)
>> at
>> org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProdu
>> cer.java:227)
>> at
>> org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessa
>> geProducerSupport.java:241)
>> at TopicListener.onMessage(TopicListener.java:96)
>> at
>> org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageC
>> onsumer.java:983)
>> at
>> org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionE
>> xecutor.java:122)
>> at
>> org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionEx
>> ecutor.java:192)
>> at
>> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.
>> java:122)
>> at
>> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.ja
>> va:43)
>> at
>> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
>> utor.java:885)
>> at
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
>> .java:907)
>> at java.lang.Thread.run(Thread.java:619)
>> Caused by: java.io.IOException: Unexpected error occured
>> at
>> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:
>> 191)
>> ... 1 more
>> Caused by: java.lang.OutOfMemoryError: Java heap space
>> at
>> org.apache.activemq.openwire.v3.BaseDataStreamMarshaller.tightUnmarsh
>> alByteSequence(BaseDataStreamMarshaller.java:440)
>> at
>> org.apache.activemq.openwire.v3.MessageMarshaller.tightUnmarshal(Mess
>> ageMarshaller.java:68)
>> at
>> org.apache.activemq.openwire.v3.ActiveMQMessageMarshaller.tightUnmars
>> hal(ActiveMQMessageMarshaller.java:67)
>> at
>> org.apache.activemq.openwire.v3.ActiveMQBytesMessageMarshaller.tightU
>> nmarshal(ActiveMQBytesMessageMarshaller.java:67)
>> at
>> org.apache.activemq.openwire.OpenWireFormat.tightUnmarshalNestedObjec
>> t(OpenWireFormat.java:453)
>> at
>> org.apache.activemq.openwire.v3.BaseDataStreamMarshaller.tightUnmarsa
>> lNestedObject(BaseDataStreamMarshaller.java:126)
>> at
>> org.apache.activemq.openwire.v3.MessageDispatchMarshaller.tightUnmars
>> hal(MessageDispatchMarshaller.java:72)
>> at
>> org.apache.activemq.openwire.OpenWireFormat.doUnmarshal(OpenWireForma
>> t.java:362)
>> at
>> org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.
>> java:276)
>> at
>> org.apache.activemq.transport.tcp.TcpTransport.readCommand(TcpTranspo
>> rt.java:209)
>> at
>> org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.jav
>> a:201)
>> at
>> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:
>> 184)
>> ... 1 more
>> Received 1000 messages.
>> Received 2000 messages.
>>
>> TopicPublisher:
>> private long batch(int msgCount) throws Exception {
>> // Commented out call to waitForCompletion
>> // waitForCompletion();
>> }
>>
>> QN 1) I just want to know if I am configuring something wrong. Or should
>> I
>> increase -Xmx512m when running TopicListener to get rid of OOME?
>>
>> QN 2) Will the advisory topic:
>> ActiveMQ.Advisory.SlowConsumer.Topic.topictest.messages appear only if
>> the
>> consumer starts discarding messages? What is the basis for this topic to
>> appear in Web console?
>>
>> Thanks for your time & reply.
>> --
>> View this message in context:
>> http://www.nabble.com/Out-Of-Memory-Error-while-running-TopicPublisher-TopicListener-tp19515522p19515522.html
>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>
>>
>
>
>
> --
> James
> -------
> http://macstrac.blogspot.com/
>
> Open Source Integration
> http://open.iona.com
>
>
--
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