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That is part of it but there is also a general purpose transaction feature that lets you link together updates, state journalling and consumption all in a single transaction. This enables correct stream processing on top of Kafka and is arguably the more technically sophisticated aspect.

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This comment in tech crunch article is misleading and you may want to clarify on that. I agree that this is a nice feature for kafka streams or applications having consume-transform-produce loop. I as user/dev like kafka because of the design choices taken to keep things simple and much effective for users.

https://techcrunch.com/2017/06/30/confluent-achieves-holy-gr...

“It’s kind of insane. It’s been an open problem for so many years and Kafka has solved it — but how do we know it actually works?” she asked echoing the doubts of the community.

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