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https://issues.apache.org/jira/browse/QPID-572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525760
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Rafael H. Schloming commented on QPID-572:
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As far as I can tell there is no Subscription.getDeliveryQueue() method.
Also, I'm unsure how message selectors are supposed to work for the async
delivery path, and as I said above I'm a bit concerned that turning of the
synchronous delivery path caused selectors to break. Isn't it true that the
synchronous delivery path is just an optimization? Where exactly is the message
filtering performed for the asynchronous delivery path?
> 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
> Affects Versions: M2, M2.1, M3
> 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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