Message Groups fail to preserve exclusivity when a new consumer is added.
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Key: AMQ-2082
URL: https://issues.apache.org/activemq/browse/AMQ-2082
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.2.0
Environment: Cent5; Java 6u11; ActiveMQ 5.2;
Reporter: Gordon Hopper
Attachments: MessageGroupNewConsumerTest.java
If a new consumer is added to a running system, the exclusive property of a
message group can be temporarily violated.
Uploading a new unit test. An excerpt of the test results is below, which shows
that the message groups GrA and GrB are being handled by both consumers
simultaneously.
15:11:58,498 INFO GroupNewConsumerTest - Con2 got message GrA-5
15:11:58,560 INFO GroupNewConsumerTest - Con2 got message GrB-5
15:11:58,560 INFO GroupNewConsumerTest - Con1 got message GrB-3
15:11:58,623 INFO GroupNewConsumerTest - Con1 got message GrA-4
15:11:58,623 INFO GroupNewConsumerTest - Con2 got message GrA-6
15:11:58,685 INFO GroupNewConsumerTest - Con1 got message GrB-4
15:11:58,685 INFO GroupNewConsumerTest - Con2 got message GrB-6
15:11:58,748 INFO GroupNewConsumerTest - Con1 got message GrB-7
15:11:58,748 INFO GroupNewConsumerTest - Con2 got message GrA-7
15:11:58,810 INFO GroupNewConsumerTest - Con1 got message GrB-8
15:11:58,810 INFO GroupNewConsumerTest - Con2 got message GrA-8
15:11:58,873 INFO GroupNewConsumerTest - Con2 got message GrA-9
15:11:58,935 INFO GroupNewConsumerTest - Con2 got message GrB-9
This may be the same issue described in:
http://www.nabble.com/Message-groups-not-working-when-consuming-existing-messages-td18445237.html#a18445237
Note that setting the prefetch to 1 made reproducing the issue much easier.
(See the unit test)
keywords: JMSXGroup JMSXGroupID JMSXGroupSeq
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