What happens when a node runs out of message memory? Does the node fall over?
The RabbitMQ server has the ability to write messages to disk and forget them from memory should memory pressure occur. This allows RabbitMQ to store vastly more messages than can fit in RAM. Because of the fact that hard discs are slower than RAM, there are occasions where RabbitMQ will block producers when absolutely necessary to allow it to write out messages to disk in order to free up RAM.
