Re: Duplicate message delivered to consumers on queue with kaha persistence

> Do you get the same using AMQ store (the default in 5.0) - its the
> prefered store over kaha in ActiveMQ 5.0
>
>
>
> cheers,
>
> Rob
>
> http://rajdavies.blogspot.com/
>
>
>
> On Oct 3, 2007, at 8:50 AM, David Sitsky wrote:
>
>> I have discovered an issue with the latest activemq 5.0 (revision
>> 581510) which seems to have been present for some time, at least for
>> the last month.
>>
>> I have an application using transactions, and kaha persistence, and
>> two consumers feeding off a queue.
>>
>> I sometimes see the same message being sent to two consumers.  All
>> transactions were committed (no rollbacks), and as you can see by the
>> debug dump, the message has the same message-ID, but was delivered to
>> two separate consumers, running on separate threads, using sync
>> receives with a prefetch of 0, with separate sessions of course.
>>
>> Is this a known problem?  It doesn't always happen - seems to be a
>> race condition.  If I turn off persistence, I don't seem to see it.
>>
>> Here is the message being delivered to consumer 1:
>>
>> 2007-10-03 17:21:37,310 [Worker 060bacd87f4a40a4867113e2e3e553dd]
>> 85475 DEBUG org.apache.activemq.ActiveMQMessageConsumer -
>> ID:tamarama-62436-1191396093006-2:2:3:2 received message:
>> MessageDispatch {commandId = 0, responseRequired = false, consumerId =
>> ID:tamarama-62436-1191396093006-2:2:3:2, destination =
>> queue://worker-items, message = ActiveMQObjectMessage {commandId = 50,
>> responseRequired = false, messageId =
>> ID:tamarama-62436-1191396093006-2:2:1:3:1, originalDestination = null,
>> originalTransactionId = null, producerId =
>> ID:tamarama-62436-1191396093006-2:2:1:3, destination =
>> queue://worker-items, transactionId =
>> TX:ID:tamarama-62436-1191396093006-2:2:5, expiration = 0, timestamp =
>> 1191396097286, arrival = 0, brokerInTime = 1191396097290,
>> brokerOutTime = 1191396097303, correlationId = null, replyTo = null,
>> persistent = true, type = null, priority = 4, groupID = null,
>> groupSequence = 0, targetConsumerId = null, compressed = false, userID
>> = null, content = org.apache.activemq.util.ByteSequence@fa8cbc,
>> marshalledProperties = null, dataStructure = null, redeliveryCounter =
>> 0, size = 0, properties = null, readOnlyProperties = true,
>> readOnlyBody = true, droppable = false}, redeliveryCounter = 0}
>>
>> Here is the same message (check the message ID) being delivered to
>> consumer 2:
>>
>> 2007-10-03 17:21:37,422 [Worker 2c3169d1726b4781a423a239f65c7bd1]
>> 85587 DEBUG org.apache.activemq.ActiveMQMessageConsumer -
>> ID:tamarama-62436-1191396093006-2:2:1:2 received message:
>> MessageDispatch {commandId = 0, responseRequired = false, consumerId =
>> ID:tamarama-62436-1191396093006-2:2:1:2, destination =
>> queue://worker-items, message = ActiveMQObjectMessage {commandId = 50,
>> responseRequired = false, messageId =
>> ID:tamarama-62436-1191396093006-2:2:1:3:1, originalDestination = null,
>> originalTransactionId = null, producerId =
>> ID:tamarama-62436-1191396093006-2:2:1:3, destination =
>> queue://worker-items, transactionId =
>> TX:ID:tamarama-62436-1191396093006-2:2:5, expiration = 0, timestamp =
>> 1191396097286, arrival = 0, brokerInTime = 1191396097290,
>> brokerOutTime = 1191396097417, correlationId = null, replyTo = null,
>> persistent = true, type = null, priority = 4, groupID = null,
>> groupSequence = 0, targetConsumerId = null, compressed = false, userID
>> = null, content = org.apache.activemq.util.ByteSequence@1a881cc,
>> marshalledProperties = null, dataStructure = null, redeliveryCounter =
>> 0, size = 0, properties = null, readOnlyProperties = true,
>> readOnlyBody = true, droppable = false}, redeliveryCounter = 0}
>>
>> I'll need to do more investigations tomorrow, but if anybody has any
>> ideas, I'd appreciate some insights.
>>
>> --
>> Cheers,
>> David
>>
>> Nuix Pty Ltd
>> Suite 79, 89 Jones St, Ultimo NSW 2007, Australia    Ph: +61 2 9280 0699
>> Web: http://www.nuix.com                            Fax: +61 2 9212 6902