Exactly-once Support in Apache Kafka

On Thursday we released a new version of Apache Kafka that dramatically strengthens the semantic guarantees it provides. This release came at the tail end of several years of thinking through how to do reliable stream processing in a way that is fast, practical, and correct. The implementation effort itself was on the order of about a year, including an extended period in which about a hundred pag

[legoboku]

"Exactly Once Delivery/Semantics is mathematically impossible."

[kimutansk]

さすが素晴らしい解説。結局の所、Producerからの重複投入防止と、Kafkaに対する複数のアクセスをアトミックに出来た結果、これまでのKafkaの機能群と併せてストリーム処理の選択肢が増えるのが実際と。