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https://supergloo.com/kafka/kafka-architecture-delivery/
Kafka Delivery Guarantee Considerations Simply put, there are costs and considerations with each of the processing options. Considerations include additional performance burdens which increase latency, the additional complexity of your implementation which may make your design more brittle, etc.
https://jack-vanlightly.com/blog/2017/12/15/rabbitmq-vs-kafka-part-4-message-delivery-semantics-and-guarantees
Dec 26, 2017 · Both have guarantees regarding the order of message delivery. Kafka offers real transaction support, with the primary use case being read-process-write. Care needs to be taken to avoid impacting throughput. With Kafka, if a consumer does not process some messages due to a failure and a poor use of offset tracking,...
https://dzone.com/articles/does-kafka-really-guarantee-the-order-of-messages
Since Kafka 2.1.0 when a message will not be acknowledged by the broker, then it will be resent again by the producer, by default, at most 2147483647 (MAX_INT) times or until delivery.timeout.ms ...
https://blog.softwaremill.com/does-kafka-really-guarantee-the-order-of-messages-3ca849fd19d2
Aug 27, 2019 · So from our point of view, the most important thing to remember is that Kafka preserves the order of messages within a partition. For some use cases, preserving ordering of messages can be very important from a business point of view. For example, let’s say that you are working on some kind of banking project,...
https://medium.com/@felipedutratine/kafka-ordering-guarantees-99320db8f87f
Feb 02, 2018 · Kafka guarantee the order and it’s one of the reasons for choosing kafka. But to have your messages ordered they are somethings to know. Physically topics are split into partitions.
https://www.baeldung.com/kafka-exactly-once
Nov 06, 2018 · In this tutorial, we'll look at how Kafka ensures exactly-once delivery between producer and consumer applications through the newly introduced Transactional API. Additionally, we'll use this API to implement transactional producers and consumers to achieve end-to-end exactly-once delivery in a WordCount example.
https://www.confluent.io/blog/exactly-once-semantics-are-possible-heres-how-apache-kafka-does-it/
Jun 30, 2017 · Exactly-once semantics in Apache Kafka, explained Prior to 0.11.x, Apache Kafka supported at-least once delivery semantics and in-order delivery per partition. As you can tell from the example above, that means producer retries can cause duplicate messages.
https://www.quora.com/Apache-Kafka-provides-at-least-once-guarantee-Someone-knows-when-support-for-exactly-once-delivery-will-be-available-on-Apache-Kafka
But here is my take: it's kinda hard (not impossible ) to guarantee only at Kafka level. Consider this , What if the producing client feeding Kafka sends duplicates. Kafka purely goes via offsets nothing beyond. Two exactly same message sent to a topic twice will take 2 different offsets and as per your system it's a duplicate but per Kafka no !.
https://kafka.apache.org/documentation/
Kafka Streams is a client library for processing and analyzing data stored in Kafka. It builds upon important stream processing concepts such as properly distinguishing between event time and processing time, windowing support, exactly-once processing semantics and simple yet efficient management of application state.
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