[
https://issues.apache.org/jira/browse/QPID-572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621765#action_12621765
]
Rob Godfrey commented on QPID-572:
----------------------------------
As described in QPID-950, the subscriber now uses a pointer to the strictly
ordered queue and will only attempt delivery from the queue - it cannot be
"short-circuited". On message arrival a fast-path is used if it is detected
that the message would be the next one that a subscription would consider
delivering. See the description of QPID-950 for an overview of the design of
the new queuing model.
> 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
> Assignee: Rob Godfrey
> Fix For: M3
>
> Attachments: QPID-572-testcase.patch
>
>
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
