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From "Andrey Zavodnik (JIRA)" <>
Subject [jira] [Updated] (AMQ-4683) Scheduler discards overdue messages on startup
Date Wed, 14 Aug 2013 14:10:49 GMT


Andrey Zavodnik updated AMQ-4683:


Test case. As the issue affected by race condition, the test may not fail every time, but
it does fail often
> Scheduler discards overdue messages on startup
> ----------------------------------------------
>                 Key: AMQ-4683
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.8.0
>         Environment: Windows 7 64bit, JDK 1.6.0_26
>            Reporter: Andrey Zavodnik
>            Priority: Critical
>              Labels: scheduler
>         Attachments:
> When message is scheduled for a delivery (using AMQ_SCHEDULED_PERIOD property) it is
not posted to the queue, but saved to the scheduler’s repository instead. If Broker instance
is shut down at the time for which the message is scheduled for a delivery, the scheduler
will try to process the message at the next time broker is started up. Due to a bug in the
scheduler implementation such messages may be dismissed rather than posted to the queue depending
on the racing conditions inside the JVM.
> Actual bug resides in
> This method first calls JobSchedulerStoreImpl. getJobScheduler(String name) method which
in turn creates an instance of runnable JobSchedulerImpl class and starts it.
> Then SchedulerBroker registers itselfas a listener of the newly created JobSchedulerImpl.
> Unfortunately this may happen after the JobSchedulerImpl have dismissed all the “missed”
tasks as “fired” as there were no listeners configured.

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