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From "Torsten Mielke (JIRA)" <>
Subject [jira] Created: (AMQ-1896) >1 transactional and exclusive consumer receiving messages at the same time.
Date Tue, 19 Aug 2008 19:57:52 GMT
>1 transactional and exclusive consumer receiving messages at the same time.

                 Key: AMQ-1896
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.1.0
         Environment:   * ActiveMQ 5.1.0
  * one broker using direct jdbc persistence (mysql)
  * transacted producer/consumer
  * 3 consumers but all configured for exclusive consumer
  * 1 producer that publishes msgs faster than consumers 

            Reporter: Torsten Mielke
            Priority: Critical

With an env as described above it is possible to violate the exclusive consumer limitation.
Initially with all three consumers being started and the producer sending messages, the exclusive
consumer feature works fine. 
However if you kill and restart each consumer in a row, allowing another consumer to take
over, you will eventually reach a state where a newly started consumer that should not be
allowed to receive messages (as another active consumer already has the exclusive right) will
also start receiving messages. Typically the msg numbers it receives are of higher numbers
than those to be delivered next (e.g. exclusive consumer receives msg number 500 while new
consumer receives msg number 1500). 
So this bug violates:
- having just one exclusive consumer at any time
- delivering all msgs in order.

I could not reproduce this problem using the default AMQ store. 

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