[ https://issues.apache.org/activemq/browse/AMQ-878?page=all ]
Nikolai Penkov resolved AMQ-878.
--------------------------------
Fix Version/s: 4.1
Resolution: Fixed
Tested in ebbeded broker (JBoss 4.0.4.GA) with 20K+ (10k+ size each) messages
in Queue on startup. 2 Subscribers and 1 producer Connected on startup.
(Compiled with JDK1.5+)
> JMX Exception: "Destination already created" when recovering gigantic queues
> from database
> ------------------------------------------------------------------------------------------
>
> 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
> Assigned To: Hiram Chirino
> Fix For: 4.1
>
> 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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