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From "ashwini kuntamukkala (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2918) ActiveMQMapMessage stay in memory causing leaks
Date Tue, 14 Sep 2010 20:17:40 GMT
ActiveMQMapMessage stay in memory causing leaks
-----------------------------------------------

                 Key: AMQ-2918
                 URL: https://issues.apache.org/activemq/browse/AMQ-2918
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.4.0
         Environment: Windows XP
            Reporter: ashwini kuntamukkala


I am running embedded broker in a spring container. During a volume test, I forward messages
to a  dead letter queue. ActiveMQMapMessage that are being redirected to dead letter queue
stay in memory. So, if I forward 15000 messages to dead letter queue, all 15000 messages will
be in memory. These are persistent messages. 
I want to have a smaller memory footprint. Why are the activemqmapmessages staying in memory.
the ones that were successfully processed get deleted just fine. 

This is jmap -histo output
  14:         19826        3647984  org.apache.activemq.command.ActiveMQMapMessage
  28:         19791         791640  org.apache.activemq.command.ActiveMQQueue

total of 19K+ activeMqMapMessages and  ActiveMQQueue instances...

Since these are dead letter messages, why does ActiveMQ need to hold references to these messages
in memory??

----------------------------------

I tried using the filequeuecursor: after a while the broker stopped responding because of
the following error. 

org.apache.activemq.broker.TransportConnection.Service.serviceException() 294 : Async error
occurred: java.lang.RuntimeException: java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
	at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:228)
	at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.addMessageLast(FilePendingMessageCursor.java:192)
	at org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1601)
	at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:707)
	at org.apache.activemq.broker.region.Queue.send(Queue.java:646)
	at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:365)
	at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:494)
	at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129)
	at org.apache.activemq.broker.scheduler.SchedulerBroker.send(SchedulerBroker.java:136)
	at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129)
	at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
	at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:230)
	at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
	at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:460)
	at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:663)
	at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309)
	at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185)
	at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
	at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69)
	at org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:218)
	at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)
	at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:176)
	at org.apache.activemq.store.kahadb.plist.PList$2.execute(PList.java:163)
	at org.apache.kahadb.page.Transaction.execute(Transaction.java:728)
	at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:161)
	at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:221)
	... 24 more


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