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From "Rafael H. Schloming (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Created: (QPID-580) MessageRequeueTest.testTwoCompetingConsumers occasionally fails
Date Wed, 05 Sep 2007 20:39:33 GMT
MessageRequeueTest.testTwoCompetingConsumers occasionally fails
---------------------------------------------------------------

                 Key: QPID-580
                 URL: https://issues.apache.org/jira/browse/QPID-580
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker, Java Client
            Reporter: Rafael H. Schloming


There are a few odd things about this test as it is written. It is called test*Two*CompetingConsumers,
however it actually creates 4 consumers and then only starts 3 out of the 4. Also, the way
the test is constructed, it is theoretically possible for it to fail even though there is
no bug. This is because each competing consumer will exit whenever it takes longer than 3
seconds to retrieve a message. This makes it impossible to tell whether the test is failing
because messages have been lost, or whether it is simply failing because messages remain in
the queue. The former would indicate a real bug, whereas the latter could occasionally occur
spontaneously if the competing threads get starved.

We should probably check the number of messages left in the queue and fail with a different
assertion of messages have actually been lost. This should tell us if the occasional failures
are spurious or not and if so permit us to tune the retrieve timeout in order to avoid them.


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