Re: Out Of Memory Error while running TopicPublisher/TopicListener

[Rob Davies]

Which version ?
On 16 Sep 2008, at 17:33, Badri wrote:

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.
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