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From "Remo Gloor (JIRA)" <>
Subject [jira] [Created] (AMQ-4878) Message can be acknowledged succesfully it two different transactions
Date Tue, 12 Nov 2013 15:16:17 GMT
Remo Gloor created AMQ-4878:

             Summary: Message can be acknowledged succesfully it two different transactions
                 Key: AMQ-4878
             Project: ActiveMQ
          Issue Type: Bug
            Reporter: Remo Gloor

- Two clients are connected to AMQ listening on the same queue. 
- When a message is sent to that queue it is processed and acknowledged by one of these clients
in a transaction. After processing it does a 2 phase commit. 
- The connection is lost right after prepare is sent. The failover now reconnects and replays
these messages and sends a commit later.

- After the connection is lost AMQ sends the same message to the other client due to the connection
loss (most likely because the prepare did not arrive). This client creates another transaction,
processes and acknowledges the message. The transaction is now prepared and commit.

The problem is that the same message is processed in two clients succesfully. Both were able
to acknowledge the message in two different transactions. I'd expect that just one (the first?)
prepare that arrives at the server is succesful. The other must fail so that all the work
done on that client (e.g. DB modifications and sent messages) is reverted by this second transaction.

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