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From "Rob Davies (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-921) When recovering messages on startup - execution of Store.getMessage is executed as many times as many subscribers to this destination there are
Date Wed, 09 Apr 2008 18:49:33 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rob Davies resolved AMQ-921.
----------------------------

    Fix Version/s: 5.1.0
                       (was: 5.2.0)
       Resolution: Fixed

> When recovering messages on startup - execution of Store.getMessage is executed as many
times as many subscribers to this destination there are
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-921
>                 URL: https://issues.apache.org/activemq/browse/AMQ-921
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 4.1.0
>         Environment: Any
>            Reporter: Nikolai Penkov
>            Assignee: Rob Davies
>            Priority: Minor
>             Fix For: 5.1.0
>
>
> Fix of issue https://issues.apache.org/activemq/browse/AMQ-878 (when recovering gigantic
queues) come to a new performance problem. - When recovering messages on startup - execution
of Store.getMessage (from IndirectMessageRefference.incrementReferenceCount)  is executed
as many times as many subscribers to this destination there are. E.g.
> 1. Start of broker with a queue A with a lot of messages
> 2. Queue is recovered from database by creation of IndirectMessageRefferences
> 3. 2 Subscribers connect to recovered queue  with two different message selectors.
> 4. Messages are loaded from database (IndirectMessageRefference.incrementReferenceCount
-> destinationStore.getMessage) twice - for 2 subscribers...

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