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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2572) Timing issue on consumer close can lead to unconsumed messages being inadvertently marked as duplicates and not getting delivered
Date Mon, 18 Jan 2010 09:48:43 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2572.
-----------------------------

    Resolution: Fixed

resolved in r900317

> Timing issue on consumer close can lead to unconsumed messages being inadvertently marked
as duplicates and not getting delivered  
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2572
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2572
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.3.1, 5.4.0
>
>
> Intermittent failure of activemq-core/src/test/java/org/apache/activemq/bugs/AMQ2102Test.java
on Linux. Tracking this failure down, the problem of the hung test was missing messages, part
of the prefetch that were delivered while the consumer was closing. A timing issue between
the audit rollback of  unconsumed messages and the delivery of messages meant that some messages
were not rolledback on close.
> The use case has consumers that connect, consume a batch of 10 messages in individual
transactions and close. These operations complete before the prefetch(1000) messages haven
been delivered so there was concurrent delivery and closure happing which sometimes resulted
in the problem.
> The fix is to ensure the consumer is removed from the session and closed prior to doing
the audit rollback on unconsumed messages.

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