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From "Mathieu Baril (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2949) Message priority is not always handled correctly
Date Wed, 29 Sep 2010 12:35:44 GMT
Message priority is not always handled correctly
------------------------------------------------

                 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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