What type of ordering does RabbitMQ offer?
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In RabbitMQ, messages are delivered to consumers in a FIFO pattern. However, with multiple consumers, the order of processing isn’t guaranteed. FIFO is also not guaranteed for sharded or priority queues.
Memphis Approach
Memphis supports a publisher-subscriber model that handles numerous message stream stored in a queue that stores messages in order of arrival. In other words, the queue follows FIFO – First In First Out. Ordering is only guaranteed when working with one consumer group. All consumer groups will receive the messages present on the station.