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From "Rajani Chennamaneni (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2009) Problem with message dispatch after a while
Date Thu, 20 Nov 2008 23:59:05 GMT
Problem with message dispatch after a while
-------------------------------------------

                 Key: AMQ-2009
                 URL: https://issues.apache.org/activemq/browse/AMQ-2009
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.2.0, 5.1.0
            Reporter: Rajani Chennamaneni
            Priority: Blocker
         Attachments: DispatchMultipleConsumersTest.java

Messages are not getting dispatched after a while (although it accepts new incoming messages)
until restart of the broker. This problem is described in several posts.

http://www.nabble.com/Pending-Messages-are-shown-in-ActiveMQ-td20241332.html

http://www.nabble.com/Consumer-Listener-stop-receving-message-until-ActiveMQ-restart-td20355247.html

http://www.nabble.com/Stuck-messages---Dispatch-issues-td20467949.html

There was also an issue opened in Spring project for this thinking it was Spring problem.

http://jira.springframework.org/browse/SPR-5110

I am not able to reproduce with Junit test case having BrokerService started with in the test
case. I guess I am not hitting the right stress conditions this way. But when I run the test
case against an externally running ActiveMQ instance backed with oracle database persistence,
it is reproducible most of the times. This is not a every time failure situation, it takes
more time once than the other.

I was able to hit this situation of stuck messages on queue using following scenario most
of the times:

1) Start 2 concurrent consumers for the queue using Spring's DefaultMessageListenerContainer
using cacheLevelName as CACHE_CONSUMER
2) Send messages using JMETER 2.3.2 to the queue on ActiveMQ stand alone broker instance with
50 threads looping 20 times.
3) After a while, you will notice that Spring logs that no messages are being received but
the messages are shown jconsole of ActiveMQ and the database backing it for persistence.

But in 5.2 RC3, the problem is that it dispatches duplicate messages and does not remove them
from broker's database after acknowledge properly.

Attached test case might help to reproduce when run against externally running stand alone
ActiveMQ broker. Another way to see the problem is that try to load test using JMETER by sending
messages to a queue with a camel route that moves messages from this queue to another and
you will notice that it stops moving after while or copied duplicates in case of 5.2 RC3.

Sorry about such a huge description but it is a real problem! A different team at our company
are having this issue in production with 5.1. They are using it as an embedded broker with
derby for persistence.



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