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https://issues.apache.org/activemq/browse/AMQ-1896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Torsten Mielke updated AMQ-1896:
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Attachment: AMQ-1896-JUnit.zip
Attaching testcase in JUnit format. Follow instructions in README.txt.
> >1 transactional and exclusive consumers receiving messages at the same time.
> -----------------------------------------------------------------------------
>
> Key: AMQ-1896
> URL: https://issues.apache.org/activemq/browse/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
> * using SESSION.AUTO_ACKNOWLEDGE
> Reporter: Torsten Mielke
> Priority: Critical
> Fix For: 5.3.0
>
> Attachments: AMQ-1896-JUnit.zip, HelloWorldJMS_ART-1896.zip
>
>
> 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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