[jboss-jira] [JBoss JIRA] Created: (JBMESSAGING-1885) Duplicated message delivery in closing a connection while a transaction is committing

[Yong Hao Gao (JIRA)]

Duplicated message delivery in closing a connection while a transaction is committing
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                 Key: JBMESSAGING-1885
                 URL: https://issues.jboss.org/browse/JBMESSAGING-1885
             Project: JBoss Messaging
          Issue Type: Bug
          Components: Messaging Core
    Affects Versions: 1.4.8.SP1, 1.4.0.SP3.CP13
            Reporter: Yong Hao Gao
            Assignee: Yong Hao Gao
             Fix For: 1.4.0.SP3.CP14, 1.4.8.SP2


A message may be delivered twice when the following events happens in order:

1. A client receives a message in a transaction and is committing it. In the meantime the connection is closed (by, for example, user shut down the client application) in another thread.
2. At the server side, the connection closing will cause the message (not prepared) to be cancelled back to queue. In the meantime the committing will remove the message. Both actions are performed concurrently.
3. If the committing happens before the connection closing, transaction commit successfully and message won't get cancelled. But if the committing happens after connection closing, there is a chance the message is cancelled back to queue and  yet the transaction is committed successfully. So the message will be delivered twice.


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