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https://issues.apache.org/jira/browse/AMQ-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Swen Moczarski updated AMQ-3140:
--------------------------------

    Attachment: AMQ3140.patch
                AMQ3140Test.patch

Unit test and patch attached. To get the needed concurrency in the test, I have 
disable the debug log for the scheduling component (see modification in 
log4j.properties file).

> Lost messages when scheduling messages concurrently
> ---------------------------------------------------
>
>                 Key: AMQ-3140
>                 URL: https://issues.apache.org/jira/browse/AMQ-3140
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.4.2
>            Reporter: Swen Moczarski
>         Attachments: AMQ3140.patch, AMQ3140Test.patch
>
>
> We observed some problems with the scheduler component. One issue is, that 
> the kaha db files from the scheduler won't be removed. On further 
> investigation I found a potential cause which could be exposed by a test. 
> When messages are send concurrently delayed by the scheduler, messages will 
> be lost. It seems that the schedule method on JobSchedulerImpl should be 
> synchronized.

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