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From "james strachan (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (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 Tue, 26 Sep 2006 11:43:23 GMT
     [ https://issues.apache.org/activemq/browse/AMQ-921?page=all ]

james strachan reassigned AMQ-921:
----------------------------------

    Assignee: Hiram Chirino

> 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
>         Environment: Any
>            Reporter: Nikolai Penkov
>         Assigned To: Hiram Chirino
>            Priority: Minor
>
> 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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