Github user franz1981 commented on the issue:
https://github.com/apache/activemq-artemis/pull/1477
@clebertsuconic
Here:
https://github.com/apache/activemq-artemis/blob/e81c8c26d02f156e75fe03cb8cc8ad92e4bca30e/artemis-server/src/main/java/org/apache/activemq/artemis/core/protocol/core/ServerSessionPacketHandler.java#L231
On each first ThreadLocal::get call from a different thread, the
ThreadLocal allocates and cache (locally to the thread) a new AtomicBoolean.
In addition, the AtomicBoolean::get and AtomicBoolean::set operations can
be avoided to "mark" the handler thread...
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