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From "Rafael H. Schloming (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Created: (QPID-572) broker delivers messages out of order
Date Tue, 04 Sep 2007 18:14:45 GMT
broker delivers messages out of order
-------------------------------------

                 Key: QPID-572
                 URL: https://issues.apache.org/jira/browse/QPID-572
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker
            Reporter: Rafael H. Schloming


ConcurrentSelectorDeliveryManager will sometimes deliver messages out of order. This is caused
by the code in deliver(...) that attempts to short-circuit message queuing when there is an
available subscription. This code can result in the currently published message skipping ahead
of queued messages causing out of order delivery. Although unrelated to transactions, I have
observed this failure occuring in TransactedTest both in testCommit and testRollback. Normally
it does not happen very frequently, however placing a Thread.sleep(500) in the async delivery
thread will cause the failure to occur almost all the time.

I tried fixing the problem by only attempting synchronous delivery when there are no queued
messages, however this appears to break other tests that use selectors. This makes me suspect
that the selector implementation is somehow incorrectly coupled to synchronous delivery.

I have only verfied this issue on the trunk, however I believe it effects M2 as well.

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