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From "Nikolai Penkov (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-878) JMX Exception: "Destination already created" when recovering gigantic queues from database
Date Sat, 12 Aug 2006 08:21:28 GMT
JMX Exception: "Destination already created" when recovering gigantic queues from database
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                 Key: AMQ-878
                 URL: https://issues.apache.org/activemq/browse/AMQ-878
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: incubation
         Environment: Embeded broker, Any platform (OS, JDK) - currentlly embeded in JBoss
4.0.4.GA
            Reporter: Nikolai Penkov
         Attachments: async-recovery.patch

I think this issue is described in Hiram's blog: http://blogbucket.blogspot.com/2006/05/scaling-to-gigantic-queues-and-topics.html.

E.g. when broker is stopped with a lot of messages in queue. When started - recovery process
is fired (currently on creation of a queue), and if another subscriber requests queue - it
creates a new one, because previous process hasn't finished.

I think the simpliest solution for that problem is to start recovery process in another thread
with synchronization to sent process(sent process should be suspended till full recovery is
done) and subscriber notification method (every sunscriber should be notified on recovery
of message).

I have attached a patch to activemq-core, which I have tested with my environment - JBoss
4.0.4.GA with Embeded Broker ActiveMQ trunk release, jdbc persistence.

I am not a spec. in threads nor in ActiveMQ design, and I am sure that you will find a more
elegant sollution to what I have provided.

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