>1 transactional and exclusive consumer receiving messages at the same time.
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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
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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