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https://issues.apache.org/jira/browse/AMQ-5942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14708119#comment-14708119
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Ben O'Day commented on AMQ-5942:
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that said, after looking at the CachedMessageGroupMapFactory a little further,
I can see that its using an LRUMap, so I suppose its not a hard limit...
either way, we were seeing some concurrency issues when using the default map,
switching to the simple map seems to have resolved the issue...
> make SimpleMessageGroupMapFactory the default
> ---------------------------------------------
>
> Key: AMQ-5942
> URL: https://issues.apache.org/jira/browse/AMQ-5942
> Project: ActiveMQ
> Issue Type: Improvement
> Reporter: Ben O'Day
> Priority: Trivial
>
> the current default factory is the CachedMessageGroupMapFactory and has with
> a limit of 1024 keys by default.
> Any reason the SimpleMessageGroupMapFactory can't be the default instead
> since it doesn't have a size limit?
> per http://scott.cranton.com/2010/09/activemq-message-groups.html
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