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https://issues.apache.org/activemq/browse/AMQ-2356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=53669#action_53669
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Mats Henrikson commented on AMQ-2356:
-------------------------------------
I just downloaded the latest 5.3-SNAPSHOT dated Mon Aug 17 18:51:55 GMT+00:00
2009 and I can repro the deadlock.
> 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.obj...@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.queu...@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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