Message priority is not always handled correctly
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Key: AMQ-2949
URL: https://issues.apache.org/activemq/browse/AMQ-2949
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.4.1
Reporter: Mathieu Baril
Hi,
I'm trying to use ActiveMQ version 5.4.1 with priority.
The new features seems to work well when I left the prefetch size of my
consumer equal to the default value (1000) but is not working as I'm expecting
when I set the prefetch size to 1.
Here is the output of the attached unint test when the prefetch size equal to
1000:
2010-09-21 09:37:06,937 - JMS broker started
2010-09-21 09:37:10,087 - Sent 1(P=3)
2010-09-21 09:37:11,111 - Sent 2(P=9)
2010-09-21 09:37:12,140 - Sent 3(P=3)
2010-09-21 09:37:13,162 - Sent 4(P=3)
2010-09-21 09:37:14,189 - Sent 5(P=9)
2010-09-21 09:37:14,194 - Creating message consumer.
2010-09-21 09:37:14,241 - *Consumer's pefetch size=1000*
2010-09-21 09:37:14,289 - Received 2(P=9)
2010-09-21 09:37:15,276 - Sent 6(P=3)
2010-09-21 09:37:16,326 - Received 5(P=9)
2010-09-21 09:37:16,333 - Sent 7(P=9)
2010-09-21 09:37:17,354 - Sent 8(P=3)
2010-09-21 09:37:18,332 - Received 7(P=9)
2010-09-21 09:37:18,374 - Sent 9(P=3)
2010-09-21 09:37:19,396 - Sent 10(P=9)
2010-09-21 09:37:20,338 - Received 10(P=9)
2010-09-21 09:37:22,345 - Received 1(P=3)
2010-09-21 09:37:24,351 - Received 3(P=3)
2010-09-21 09:37:26,358 - Received 4(P=3)
2010-09-21 09:37:28,365 - Received 6(P=3)
2010-09-21 09:37:30,371 - Received 8(P=3)
2010-09-21 09:37:32,380 - Received 9(P=3)
2010-09-21 09:37:34,387 - Expected result : [2(P=9), 5(P=9), 7(P=9), 10(P=9),
1(P=3), 3(P=3), 4(P=3), 6(P=3), 8(P=3), 9(P=3)]
2010-09-21 09:37:34,387 - Result : [2(P=9), 5(P=9), 7(P=9), 10(P=9), 1(P=3),
3(P=3), 4(P=3), 6(P=3), 8(P=3), 9(P=3)]
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 33.851 sec
Running the same test with a prefetch value of 1 give me a different result:
2010-09-21 09:39:13,096 - JMS broker started
2010-09-21 09:39:16,293 - Sent 1(P=3)
2010-09-21 09:39:17,338 - Sent 2(P=9)
2010-09-21 09:39:18,368 - Sent 3(P=3)
2010-09-21 09:39:19,413 - Sent 4(P=3)
2010-09-21 09:39:20,443 - Sent 5(P=9)
2010-09-21 09:39:20,443 - Creating message consumer.
2010-09-21 09:39:20,489 - *Consumer's pefetch size=1*
2010-09-21 09:39:20,536 - Received 2(P=9)
2010-09-21 09:39:21,511 - Sent 6(P=3)
2010-09-21 09:39:22,550 - Received 5(P=9)
2010-09-21 09:39:22,559 - *Sent 7(P=9)*
2010-09-21 09:39:23,620 - Sent 8(P=3)
2010-09-21 09:39:24,587 - *Received 1(P=3)*
2010-09-21 09:39:24,650 - Sent 9(P=3)
2010-09-21 09:39:25,640 - Sent 10(P=9)
2010-09-21 09:39:26,590 - *Received 3(P=3) *
2010-09-21 09:39:28,567 - *Received 4(P=3) *
2010-09-21 09:39:30,574 - Received 7(P=9)
2010-09-21 09:39:32,610 - Received 10(P=9)
2010-09-21 09:39:34,622 - Received 6(P=3)
2010-09-21 09:39:36,634 - Received 8(P=3)
2010-09-21 09:39:38,616 - Received 9(P=3)
2010-09-21 09:39:40,660 - Expected result : [2(P=9), 5(P=9), 7(P=9), 10(P=9),
1(P=3), 3(P=3), 4(P=3), 6(P=3), 8(P=3), 9(P=3)]
2010-09-21 09:39:40,660 - Result : [2(P=9), 5(P=9), 1(P=3), 3(P=3), 4(P=3),
7(P=9), 10(P=9), 6(P=3), 8(P=3), 9(P=3)]
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 32.08 sec <<<
FAILURE!
As you can see, depending of the prefetch value, the message delivery order is
not the same. When the prefetch is 1, the message delivery order is not correct
(messages 1,3 and 4 are received before message 7). If you look the timestamp,
the message 7 is received by the JMS broker before message 1 is sent to the
consumer.
To run the attached unit test, you need to have maven installed and run the
following command:
mvn test -DargLine="-DprefetchSize=<prefetch_size_value> -Dactivemq.port=61616"
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