Github user franz1981 commented on the issue:
https://github.com/apache/activemq-artemis/pull/1119
@clebertsuconic Hung on AMQP always or only in the 50K case?
If you're experiencing it on the 50K case it is the effect of the
backpressure needed to avoid OOM errors while [streaming huge
messages](https://issues.apache.org/jira/browse/ARTEMIS-1036): it is
configurable using the property -Dio.netty.disable.backpressure=true or
lowering the default -Dio.netty.backpressure.millis=1000.
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