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From "Andrew Boese (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-4550) Allow messages scheduled for retry by the broker to be sent post-restart if the broker is not running at the jobs scheduled time
Date Wed, 22 May 2013 17:27:22 GMT
Andrew Boese created AMQ-4550:
---------------------------------

             Summary: Allow messages scheduled for retry by the broker to be sent post-restart
if the broker is not running at the jobs scheduled time
                 Key: AMQ-4550
                 URL: https://issues.apache.org/jira/browse/AMQ-4550
             Project: ActiveMQ
          Issue Type: New Feature
          Components: Broker
    Affects Versions: 5.8.0
            Reporter: Andrew Boese


In the current implementation, it appears that messages scheduled for retry by the broker
may be lost if the broker is not running at the time the job is scheduled to execute.  If,
for example, a message fails and is scheduled for retry at 1:30, with a 5 minute delay, the
job will be scheduled to execute at 1:35. If the broker is running at 1:35, whether continuously
or after a restart, the job will execute as expected and the message will arrive at the specified
target destination.  However, if the broker is shutdown before the scheduled time and then
started again after that time, say at 1:40, the message appears to be discarded and is not
sent.  The same behavior appears to apply as well to messages sent originally with a delay.

This may result in loss of a message that needed to be processed.  While there may be scenarios
where precise execution time of a job is critical (i.e. a job scheduled for 1:35 should not
run at any time other than 1:35), it is also possible, and in the case of retries probably
likely, that the job should execute regardless.  Message loss is generally "bad" and it would
likely be preferable that the retried message be sent at the scheduled time or the next available
opportunity in the case of a broker that is not running at the scheduled time.



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