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From "Mark Gellings (JIRA)" <>
Subject [jira] Created: (AMQNET-243) failover causes duplicate messages
Date Mon, 15 Mar 2010 17:33:45 GMT
failover causes duplicate messages

                 Key: AMQNET-243
             Project: ActiveMQ .Net
          Issue Type: Bug
          Components: NMS
    Affects Versions: 1.1.0
            Reporter: Mark Gellings
            Assignee: Jim Gomes

Reference 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.




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