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From math_baril <mathba...@gmail.com>
Subject Message priority
Date Tue, 28 Sep 2010 20:25:32 GMT

Hi,

I'm trying to use ActiveMQ version 5.4.0 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 set 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!

I cannot explain why 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.
Is it a bug in ActiveMq or something that I misunderstand?

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"

http://activemq.2283324.n4.nabble.com/file/n2717868/activemq-priority-testing.zip
activemq-priority-testing.zip 
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