When recovering messages on startup - execution of Store.getMessage is executed
as many times as many subscribers to this destination there are
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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
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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