er - we need to update the xsd ;)
5.2 has not been released yet - Gary Tully who was doing the release
is on vacation for a two weeks - but I think we'll need a new RC
cheers,
Rob
On 17 Sep 2008, at 15:51, Badri wrote:
Thanks Rob for info.
Does the tag advisoryForSlowConsumers be used in policyEntry?
I could see 2 tags for advisory - advisorySupport &
sendAdvisoryIfNoConsumers in the activemq-core-5.2.xsd. I just
referred to
activemq-core-5.2-SNAPSHOT.xsd & did not find tag
advisoryForSlowConsumers.
Not sure if I am looking at wrong place.
Where can I find the xsd & source files?
All mirror sites were giving me 404 when I wanted to download the 5.2
source.
http://www.apache.org/dist/activemq/apache-activemq/ does not have 5.2
branch. I am guessing that the 5.2 has not yet been promoted.
rajdavies wrote:
Your client is running foul of the topic prefetch - either use more
memory (as you've suggested) - or use a smaller prefetch - see
http://activemq.apache.org/what-is-the-prefetch-limit-for.html.
The slow consumer advisory will be generated from the broker when
this
limit is reached - but only if enabled (its off by default)
To enable it - use a DestinationPolicy - see
http://activemq.apache.org/per-destination-policies.html
The documentation here needs updating - but the property you need to
set is advisoryForSlowConsumers
cheers,
Rob
Rob Davies
http://rajdavies.blogspot.com/
On 16 Sep 2008, at 22:01, Badri wrote:
I am running broker, publisher, consumer all in Windows.
I have not tried this in Linux.
The broker & publisher are working fine. It's the consumer which is
crashing. Removing Thread.sleep(1000), consumer works fine. It did
not crash
for a good amount of time before I manually stopped the
TopicListener.
Windows XP Professional with SP2, 2GB RAM.
Java: 1.6.0_06
Of course this was my first test to simulate slow consumer & also
see if the
advisory topic appears in the web console. So I used my desktop &
stumbled
across this memory error. I just felt maybe crash could be due to
using
Windows. I intend to do the same test in Linux.
bsnyder wrote:
On Tue, Sep 16, 2008 at 10:33 AM, Badri
<[EMAIL PROTECTED]> 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?
You shouldn't need to raise the memory at all as there should be
nothing causing memory to grow. I just added the sleep above to the
TopicListener using ActiveMQ 5.2.0 and I've produced and consumed
over
300,000 messages in a matter of moments without any issue
whatsoever.
I'm on MacOS X using Java 1.5.0_13. What OS and Java version are
you
using?
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?
I'm not able to see the *SlowConsumer* topic appear at all. I don't
know if that's because I'm using a dual core Intel processor or
what.
What type of processor does your machine have?
Bruce
--
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unpack("u30","D0G)[EMAIL PROTECTED]&5R\"F)R=6-E+G-N>61E<D\!G;6%I;
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);'
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