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https://issues.apache.org/jira/browse/ARTEMIS-2844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168840#comment-17168840
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ASF subversion and git services commented on ARTEMIS-2844:
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Commit 0db13ee8ab60a07aa0f90cdfcf4158d0c5b00d38 in activemq-artemis's branch
refs/heads/master from Francesco Nigro
[ https://gitbox.apache.org/repos/asf?p=activemq-artemis.git;h=0db13ee ]
ARTEMIS-2844 Use writeAndFlush with voidPromise to reduce GC pressure
> Improve MQTT subscribe/unsubscribe topic performance
> ----------------------------------------------------
>
> Key: ARTEMIS-2844
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2844
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker, MQTT
> Affects Versions: 2.14.0
> Reporter: Francesco Nigro
> Priority: Major
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> MQTT (and not only) is severely effected on its performance while
> subscribing/unsubscribing when many topics are existing because:
> * SimpleAddressManager::getMatchingBindings/getDirectBindings are performing
> a linear search on all the existing Bindings
> * the results of the previous matches are saved into a Bindings instance even
> if not necessary (note: Bindings perform atomic operations while saving the
> matching Binding)
> * All the MQTT operations are performed in the Netty event loop
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