Decrease default MQTT mailbox_soft_limit #7234
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Let's decrease the mailbox_soft_limit from 1000 to 200. Obviously, both values are a bit arbitrary. However, MQTT workloads usually do not have high throughput patterns for a single MQTT connection. The only valid scenario where an MQTT connections' process mailbox could have many messages is in large fan-in scenarios where many MQTT devices sending messages at once to a single MQTT device - which is rather unusual. It makes more sense to protect against cluster wide memory alarms by decreasing the mailbox_soft_limit.
The queue type being created for MQTT connections is solely determined by the rabbitmq_mqtt plugin, not by per vhost defaults. If the per vhost default queue type is configured to be a quorum queue, we still want to create classic queues for MQTT connections.
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Let's decrease the mailbox_soft_limit from 1000 to 200.
Obviously, both values are a bit arbitrary.
However, MQTT workloads usually do not have high throughput patterns for
a single MQTT connection. The only valid scenario where an MQTT
connections' process mailbox could have many messages is in large fan-in
scenarios where many MQTT devices sending messages at once to a single MQTT
device - which is rather unusual.
It makes more sense to protect against cluster wide memory alarms by
decreasing the mailbox_soft_limit.