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Date: Mon, 24 Aug 2009 07:35:50 -0700 (PDT)
From: "Dave Stanley (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Commented: (AMQ-2356) optimizeDispatch=true and
 UseDedicatedTaskRunner=false lead to deadlocked queues
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    [ https://issues.apache.org/activemq/browse/AMQ-2356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=53758#action_53758 ] 

Dave Stanley commented on AMQ-2356:
-----------------------------------

Have you tried with the nio transport?

> optimizeDispatch=true and UseDedicatedTaskRunner=false lead to deadlocked queues
> --------------------------------------------------------------------------------
>
>                 Key: AMQ-2356
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2356
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.2.0
>            Reporter: Mats Henrikson
>
> We have an environment where we have a very large number of destinations. In an effort to reduce the number of threads I have set the options
> -Dorg.apache.activemq.UseDedicatedTaskRunner=false
> and 
> <policyEntry queue=">" optimizedDispatch="true"/>
> Unfortunately this very quickly leads to deadlocked queues.
> My environment is:
> ActiveMQ 5.2
> Ubunty Jaunty kernel 2.6.28-14-generic #47-Ubuntu SMP (although only a single core on my system)
> TCP transportConnector
> To reproduce the bug (which I can do 100% of the time) I connect 5 consumers (AUTO_ACK) to 5 different queues. Then I start 5 producers and pair them up with a consumer on a queue, and they start sending PERSISTENT messages. I've set the producer to send 100 messages and disconnect, and the consumer to receive 100 messages and disconnect. The first pair usually gets through their 100 messages and disconnect, at which point all the other pairs have deadlocked at less than 30 messages each.
> At this point I can connect jconsole and hit the Detect Deadlock button and it finds the 4 deadlocks for me. The 4 deadlocks all have the same stacktraces, one of which looks like this:
> {panel}
> Name: ActiveMQ Transport: tcp:///127.0.0.1:49307
> State: BLOCKED on java.lang.Object@f8828 owned by: ActiveMQ Transport: tcp:///127.0.0.1:48031
> Total blocked: 3  Total waited: 1
> Stack trace: 
> org.apache.activemq.broker.region.PrefetchSubscription.dispatchPending(PrefetchSubscription.java:576)
> org.apache.activemq.broker.region.PrefetchSubscription.add(PrefetchSubscription.java:150)
> org.apache.activemq.broker.region.Queue.doActualDispatch(Queue.java:1266)
> org.apache.activemq.broker.region.Queue.doDispatch(Queue.java:1230)
> org.apache.activemq.broker.region.Queue.pageInMessages(Queue.java:1308)
> org.apache.activemq.broker.region.Queue.iterate(Queue.java:1011)
> org.apache.activemq.broker.region.Queue.wakeup(Queue.java:1146)
> org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1141)
> org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:474)
> org.apache.activemq.broker.region.Queue.send(Queue.java:417)
> org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:350)
> org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:437)
> org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:224)
> org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:126)
> org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:95)
> org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:126)
> ...SpecialAuthorizationBroker.send(DynamicAuthorizationBroker.java:156)
> org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:126)
> org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:133)
> org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:450)
> org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:639)
> org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:305)
> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:179)
> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
> org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
> org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
> org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
> org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:203)
> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
> java.lang.Thread.run(Thread.java:595)
> ----------------------------------------------------------------------------------
> Name: ActiveMQ Transport: tcp:///127.0.0.1:48031
> State: BLOCKED on org.apache.activemq.broker.region.Queue$2@102d82c owned by: ActiveMQ Transport: tcp:///127.0.0.1:49307
> Total blocked: 3  Total waited: 0
> Stack trace: 
> org.apache.activemq.broker.region.Queue.iterate(Queue.java:951)
> org.apache.activemq.broker.region.Queue.wakeup(Queue.java:1146)
> org.apache.activemq.broker.region.Queue.removeMessage(Queue.java:1073)
> org.apache.activemq.broker.region.QueueSubscription.acknowledge(QueueSubscription.java:51)
> org.apache.activemq.broker.region.PrefetchSubscription.acknowledge(PrefetchSubscription.java:238)
> org.apache.activemq.broker.region.AbstractRegion.acknowledge(AbstractRegion.java:373)
> org.apache.activemq.broker.region.RegionBroker.acknowledge(RegionBroker.java:462)
> org.apache.activemq.broker.TransactionBroker.acknowledge(TransactionBroker.java:194)
> org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
> org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
> org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
> org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
> org.apache.activemq.broker.MutableBrokerFilter.acknowledge(MutableBrokerFilter.java:85)
> org.apache.activemq.broker.TransportConnection.processMessageAck(TransportConnection.java:456)
> org.apache.activemq.command.MessageAck.visit(MessageAck.java:205)
> org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:305)
> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:179)
> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
> org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
> org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
> org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
> org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:203)
> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
> java.lang.Thread.run(Thread.java:595)
> {panel}

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