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https://issues.apache.org/activemq/browse/AMQNET-194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=54674#action_54674
]
Mark Gellings commented on AMQNET-194:
--------------------------------------
The exception is "An item with the same key has already been added."
It's adding a command.CommandId of 7 as the key, and that key is used in the
first position of the requestMap dictionary.
Tracked tracked = stateTracker.track(command);
lock(((ICollection) requestMap).SyncRoot)
{
if(tracked != null && tracked.WaitingForResponse)
{
--->>> requestMap.Add(command.CommandId, tracked);
}
else if(tracked == null && command.ResponseRequired)
{
requestMap.Add(command.CommandId, command);
}
}
This causes the handleTransportFailure method to be fired and the
connectedTransport set to null (ITransport transport =
connectedTransport.GetAndSet(null);). The iterate() method on FailoverTask then
issues doConnect():
parent.backupMutex.WaitOne();
if(parent.ConnectedTransport == null && doReconnect)
{
result = parent.doConnect();
buildBackup = false;
}
And then the restoreTransport method is called which seems to reissue all the
commands for the 65365 messages already processed. It seems like there's two
things potentially problematic, 1) the commandId of 7 is being created again
which triggers the error 2) the restore Transport method resends all the
commands it already sent commands for those 65535 messages.
Another question is how come the messages are tracked? I know it has something
to do with the failover protocol/transport but seems wrong to be
storing/tracking all the messages that the broker has already deleted from the
queue.
Perhaps this is fixed in NMS trunk but this is the official 1.1 version so I
imagine a lot of folks are using this. I guess my next step is figuring out how
those commandIds are generated and why it is reset back to a value of 7? Any
help/thoughts appreciated...
> Async error occurred: javax.jms.JMSException: Unmatched acknowledege when
> Acknowledgemode of Transactional used
> ---------------------------------------------------------------------------------------------------------------
>
> Key: AMQNET-194
> URL: https://issues.apache.org/activemq/browse/AMQNET-194
> Project: ActiveMQ .Net
> Issue Type: Bug
> Components: ActiveMQ, NMS
> Affects Versions: 1.0.0, 1.1.0
> Environment: ActiveMQ 5.2 as Windows Service on Windows Server 2008
> 64-bit. Client producer and consumer on Windows XP
> Reporter: Mark Gellings
> Assignee: Timothy Bish
> Fix For: 1.2.0
>
> Attachments: activemq.xml, NativeNMSConsumerAndProducer.zip
>
>
> See
> http://www.nabble.com/Async-error-occurred--%3E-ActiveMQ-5.2-and-NMS-td25474605.html
> for a primer to this issue.
> After troubleshooting this, it appears that if a producer sends 65535+
> messages to the broker that the consumer gets into an infinite loop after
> consuming 65535 messages.
> I will be attaching a test case for this. Run a producer and a consumer,
> send 100,000 messages and the test case fails at 65535 messages consumed
> exactly.
> What appears to be happening is that the NMS provider (or ActiveMQ 5.2) is
> hitting the upper bound of a ushort and then starting all back over again
> sending message acknowledgements from message #1. This message was already
> dispatched though and the broker lot shows an error that the message is not
> in the dispatched-list .
> The consumer shows a message acknowledgement going out.
> These errors repeat infinitely it seems. Once the 65535th message errors out
> then it starts all over again at the 1st message.
> Notice the ProducerSequenceId growing beyond 65535. I can't seem to avoid
> this error, even if I reinstantiate the producer sporadically.
> At the beginning of the source code I have included a loop which shows the
> behavior of incrementing a ushort beyond 65535. The variable resets to the
> lower bound as expected.
> [DEBUG] Apache.NMS.Tracer - Sending Ack: MessageAck[
> Destination=queue://testmonday150 TransactionId=LocalTransactionId[
> Value=30558 ConnectionId=ConnectionId[
> Value=2b6ae5a1-c0e1-4523-8d9c-4143cc9d74e8 ] ] ConsumerId=ConsumerId[
> ConnectionId=2b6ae5a1-c0e1-4523-8d9c-4143cc9d74e8 SessionId=1 Value=1 ]
> AckType=2 FirstMessageId=MessageId[ ProducerId=ProducerId[
> ConnectionId=9e256437-df18-44e5-9cb2-b7f3feaebcfd Value=1 SessionId=1 ]
> ProducerSequenceId=30558 BrokerSequenceId=80280 ] LastMessageId=MessageId[
> ProducerId=ProducerId[ ConnectionId=9e256437-df18-44e5-9cb2-b7f3feaebcfd
> Value=1 SessionId=1 ] ProducerSequenceId=30558 BrokerSequenceId=80280 ]
> MessageCount=1 ]
> ERROR Service -
> Async error occurred: javax.jms.JMSException: Unmatched acknowledege:
> MessageAc
> k {commandId = 26140, responseRequired = false, ackType = 2, consumerId =
> 41b092
> 97-da4b-4d11-9ed7-09d344825740:1:1, firstMessageId =
> 4128971e-c69b-4892-8be5-d99
> 868045881:1:1:30558, lastMessageId =
> 4128971e-c69b-4892-8be5-d99868045881:1:1:30
> 558, destination = queue://testwed924, transactionId =
> TX:41b09297-da4b-4d11-9ed
> 7-09d344825740:30558, messageCount = 1}; Could not find Message-ID
> 4128971e-c69b
> -4892-8be5-d99868045881:1:1:30558 in dispatched-list (start of ack)
> INFO | jvm 1 | 2009/10/07 14:03:27 | javax.jms.JMSException: Unmatched
> ackn
> owledege: MessageAck {commandId = 26140, responseRequired = false, ackType =
> 2,
> consumerId = 41b09297-da4b-4d11-9ed7-09d344825740:1:1, firstMessageId =
> 4128971e
> -c69b-4892-8be5-d99868045881:1:1:30558, lastMessageId =
> 4128971e-c69b-4892-8be5-
> d99868045881:1:1:30558, destination = queue://testwed924, transactionId =
> TX:41b
> 09297-da4b-4d11-9ed7-09d344825740:30558, messageCount = 1}; Could not find
> Messa
> ge-ID 4128971e-c69b-4892-8be5-d99868045881:1:1:30558 in dispatched-list
> (start o
> f ack)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.re
> gion.PrefetchSubscription.assertAckMatchesDispatched(PrefetchSubscription.java:4
> 38)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.re
> gion.PrefetchSubscription.acknowledge(PrefetchSubscription.java:188)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.re
> gion.AbstractRegion.acknowledge(AbstractRegion.java:373)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.re
> gion.RegionBroker.acknowledge(RegionBroker.java:462)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Tr
> ansactionBroker.acknowledge(TransactionBroker.java:194)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Br
> okerFilter.acknowledge(BrokerFilter.java:74)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Br
> okerFilter.acknowledge(BrokerFilter.java:74)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Br
> okerFilter.acknowledge(BrokerFilter.java:74)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Br
> okerFilter.acknowledge(BrokerFilter.java:74)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Mu
> tableBrokerFilter.acknowledge(MutableBrokerFilter.java:85)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Tr
> ansportConnection.processMessageAck(TransportConnection.java:456)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.command.M
> essageAck.visit(MessageAck.java:205)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Tr
> ansportConnection.service(TransportConnection.java:305)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.broker.Tr
> ansportConnection$1.onCommand(TransportConnection.java:179)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.transport
> .TransportFilter.onCommand(TransportFilter.java:68)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.transport
> .WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.transport
> .InactivityMonitor.onCommand(InactivityMonitor.java:206)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.transport
> .TransportSupport.doConsume(TransportSupport.java:84)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.transport
> .tcp.TcpTransport.doRun(TcpTransport.java:203)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> org.apache.activemq.transport
> .tcp.TcpTransport.run(TcpTransport.java:185)
> INFO | jvm 1 | 2009/10/07 14:03:27 | at
> java.lang.Thread.run(Unknown
> Source)
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