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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