Adam Zyzak created ARTEMIS-5121:
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Summary: Improve performance of SUBSCRIPTION_IDENTIFIER fetching
from MQTT session state
Key: ARTEMIS-5121
URL: https://issues.apache.org/jira/browse/ARTEMIS-5121
Project: ActiveMQ Artemis
Issue Type: Improvement
Components: MQTT
Affects Versions: 2.37.0
Reporter: Adam Zyzak
Recently I performed stress test of a system using Artemis as a message broker
for MQTT and STOMP protocols. I noticed huge difference in performance and CPU
usage between these protocols.
I made some jstacks and it shown that majority of time is spent in method
org.apache.activemq.artemis.core.protocol.mqtt.MQTTSessionState#getMatchingSubscriptionIdentifiers
compiling regular expressions.
It would be helpful if performance of this method was improved, especially
since it is executed on every publish, either by caching compiled patterns,
adding special cases for simpler topic names (topic names without special
characters may be compared using equality, # subscriptions can be always added
and topic names having # at the end can be compared using startsWith) or just
adding option to configuration allowing to skip adding SUBSCRIPTION_IDENTIFIER
to publish message.
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