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From "Nikolai Penkov (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-878) JMX Exception: "Destination already created" when recovering gigantic queues from database
Date Wed, 13 Sep 2006 11:07:23 GMT
     [ 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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