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From drvillo <f.viv...@gmail.com>
Subject Re: Another deadlock showing up
Date Sat, 23 Dec 2006 18:41:43 GMT

If it can help, it happens when a consumer start sending a pretty 
high volume of messages (~100k) back into the beginning of a 
pipelined system, i.e there is recursion of still uncommitted transaction.

Cheers
Francesco


rajdavies wrote:
> 
> I've created a jira issue for this:  http://issues.apache.org/ 
> activemq/browse/AMQ-1108
> 
> cheers,
> 
> Rob
> On 23 Dec 2006, at 10:44, drvillo wrote:
> 
>> Found one Java-level deadlock:
>> =============================
>> "ActiveMQ Task":
>>   waiting to lock monitor 0x080e4f3c (object 0x92b60db0, a
>> java.util.LinkedList),
>>   which is held by "ActiveMQ Transport: tcp:///127.0.0.1:37496"
>> "ActiveMQ Transport: tcp:///127.0.0.1:37496":
>>   waiting to lock monitor 0x080e4f7c (object 0x92b60d98, a
>> org.apache.activemq.broker.region.cursors.VMPendingMessageCursor),
>>   which is held by "ActiveMQ Task"
>>
>> Java stack information for the threads listed above:
>> ===================================================
>> "ActiveMQ Task":
>>         at
>> org.apache.activemq.broker.region.PrefetchSubscription.dispatch 
>> (PrefetchSubscription.java:414)
>>         - waiting to lock <0x92b60db0> (a java.util.LinkedList)
>>         at
>> org.apache.activemq.broker.region.QueueSubscription.dispatch 
>> (QueueSubscription.java:172)
>>         at
>> org.apache.activemq.broker.region.PrefetchSubscription.dispatchMatched 
>> (PrefetchSubscription.java:397)
>>         - locked <0x92b60d98> (a
>> org.apache.activemq.broker.region.cursors.VMPendingMessageCursor)
>>         at
>> org.apache.activemq.broker.region.PrefetchSubscription.onDispatch 
>> (PrefetchSubscription.java:451)
>>         at
>> org.apache.activemq.broker.region.QueueSubscription.onDispatch 
>> (QueueSubscription.java:192)
>>         at
>> org.apache.activemq.broker.region.PrefetchSubscription$3.run 
>> (PrefetchSubscription.java:429)
>>         at
>> org.apache.activemq.broker.TransportConnection.processDispatch 
>> (TransportConnection.java:778)
>>         at
>> org.apache.activemq.broker.TransportConnection.iterate 
>> (TransportConnection.java:791)
>>         at
>> org.apache.activemq.thread.PooledTaskRunner.runTask 
>> (PooledTaskRunner.java:111)
>>         at
>> org.apache.activemq.thread.PooledTaskRunner.access$100 
>> (PooledTaskRunner.java:26)
>>         at
>> org.apache.activemq.thread.PooledTaskRunner$1.run 
>> (PooledTaskRunner.java:44)
>>         at
>> java.util.concurrent.ThreadPoolExecutor$Worker.runTask 
>> (ThreadPoolExecutor.java:650)
>>         at
>> java.util.concurrent.ThreadPoolExecutor$Worker.run 
>> (ThreadPoolExecutor.java:675)
>>         at java.lang.Thread.run(Thread.java:595)
>> "ActiveMQ Transport: tcp:///127.0.0.1:37496":
>>         at
>> org.apache.activemq.broker.region.PrefetchSubscription.dispatchMatched 
>> (PrefetchSubscription.java:383)
>>         - waiting to lock <0x92b60d98> (a
>> org.apache.activemq.broker.region.cursors.VMPendingMessageCursor)
>>         at
>> org.apache.activemq.broker.region.PrefetchSubscription.acknowledge 
>> (PrefetchSubscription.java:219)
>>         - locked <0x92b60db0> (a java.util.LinkedList)
>>         at
>> org.apache.activemq.broker.region.AbstractRegion.acknowledge 
>> (AbstractRegion.java:299)
>>         at
>> org.apache.activemq.broker.region.RegionBroker.acknowledge 
>> (RegionBroker.java:397)
>>         at
>> org.apache.activemq.broker.TransactionBroker.acknowledge 
>> (TransactionBroker.java:177)
>>         at
>> org.apache.activemq.broker.BrokerFilter.acknowledge 
>> (BrokerFilter.java:74)
>>         at
>> org.apache.activemq.broker.BrokerFilter.acknowledge 
>> (BrokerFilter.java:74)
>>         at
>> org.apache.activemq.broker.MutableBrokerFilter.acknowledge 
>> (MutableBrokerFilter.java:88)
>>         at
>> org.apache.activemq.broker.TransportConnection.processMessageAck 
>> (TransportConnection.java:491)
>>         at org.apache.activemq.command.MessageAck.visit 
>> (MessageAck.java:179)
>>         at
>> org.apache.activemq.broker.TransportConnection.service 
>> (TransportConnection.java:287)
>>         at
>> org.apache.activemq.broker.TransportConnection$1.onCommand 
>> (TransportConnection.java:178)
>>         at
>> org.apache.activemq.transport.TransportFilter.onCommand 
>> (TransportFilter.java:65)
>>         at
>> org.apache.activemq.transport.WireFormatNegotiator.onCommand 
>> (WireFormatNegotiator.java:133)
>>         at
>> org.apache.activemq.transport.InactivityMonitor.onCommand 
>> (InactivityMonitor.java:122)
>>         at
>> org.apache.activemq.transport.TransportSupport.doConsume 
>> (TransportSupport.java:84)
>>         at
>> org.apache.activemq.transport.tcp.TcpTransport.run 
>> (TcpTransport.java:137)
>>         at java.lang.Thread.run(Thread.java:595)
>>
>> Found 1 deadlock.
>>
> 
> 
> 

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