7.2 Redis Streams vs Kafka vs SQS

What happens to a message after a consumer has processed it? In Kafka, the message stays: it is a record in a replicated log on disk, and any other reader can still read it later. In SQS, the message disappears: it is a task, and the consumer deletes it once the work is done. In Redis Streams, the message also stays until it is trimmed, but it is a log entry in memory, with consumer-group bookkeeping added on top.

All three move messages from producers to consumers with some durability, and all three let several consumers share the work