💚💚 💚 Understanding RabbitMQ Classic Mirrored Queues and Quorum  Queues 💚💚 💚   I understood RabbitMQ only after I understood why Classic Mirrored Queues were replaced . When I first started learning RabbitMQ, I kept hearing: Classic Queues Classic Mirrored Queues Quorum Queues Raft Consensus Everyone said:  "Use Quorum Queues." But I couldn't understand why. To understand Quorum Queues , I first had to understand how Classic Mirrored Queues worked.