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https://issues.apache.org/activemq/browse/AMQNET-243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=58275#action_58275
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Timothy Bish commented on AMQNET-243:
-------------------------------------
I'd recommend you take a look at the Java client code. There we have some
auditing built into the framework to suppress duplicate messages that prevents
this from happening as often, there's no such support built into the NMS
framework currently.
> failover causes duplicate messages
> ----------------------------------
>
> Key: AMQNET-243
> URL: https://issues.apache.org/activemq/browse/AMQNET-243
> Project: ActiveMQ .Net
> Issue Type: Bug
> Components: NMS
> Affects Versions: 1.1.0
> Reporter: Mark Gellings
> Assignee: Jim Gomes
>
> Reference https://issues.apache.org/activemq/browse/AMQ-2627 for specifics on
> problem.
> Attached to that issue is a zip file which is password protected with
> password "fridaytest".
> We're using ActiveMQ v5.2, jdbc master/slave MSSQL 2008. Attached is an NMS
> v1.2 RC4 consumer with a transacted session as well as activemq.xml.
> To replicate:
> 1) Work through the console prompts and produce 50 msgs.
> 2) Restart console and start consuming those 50 msgs.
> 3) In the middle of the consumer processing, restart broker
> 4) The last message consumer was processing will be resent and not marked as
> redelivered. (this is the idempotent msg problem. Ex. - instead of $500
> getting deposited into your account, $1000 does)
> 5) Then NMS blows up which seems like a different problem?
> From what I understand this shouldn't be the case if you use a transacted
> session, however the attached console app can prove it is a problem.
> Bottomline--I thought this was why the camel idempotent consumer pattern [1]
> existed which can be leveraged by java clients.
> [1] http://fusesource.com/docs/router/1.6/eip/MsgEnd-Idempotent.html
> Regards,
> Mark
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