[ 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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