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https://bravenewgeek.com/you-cannot-have-exactly-once-delivery/
Mar 25, 2015 · You Cannot Have Exactly-Once Delivery. I’m often surprised that people continually have fundamental misconceptions about how distributed systems behave. I myself shared many of these misconceptions, so I try not to demean or dismiss but rather educate and enlighten, hopefully while sounding less preachy than that just did. ...
https://www.confluent.io/blog/exactly-once-semantics-are-possible-heres-how-apache-kafka-does-it/
Jun 30, 2017 · While some have outright said that exactly-once delivery is probably impossible! Now, I don’t deny that introducing exactly-once delivery semantics — and supporting exactly-once stream processing — is a truly hard problem to solve.
https://www.baeldung.com/kafka-exactly-once
Nov 06, 2018 · But, if it always delivers all messages without duplication, that is exactly-once; Initially, Kafka only supported at-most-once and at-least-once message delivery. However, the introduction of Transactions between Kafka brokers and client applications ensures exactly-once delivery in Kafka. To understand it better, let's quickly review the ...
https://supergloo.com/kafka/kafka-architecture-delivery/
Kafka Delivery Conclusion. By default, Kafka provides at-least-once delivery guarantees. Users may implement at-most-once and exactly once semantics by customizing offset location recording. In any case, Kafka offers you the option for choosing which delivery semantics you strive to achieve.
https://stackoverflow.com/questions/13484845/what-is-a-good-practice-to-achieve-the-exactly-once-delivery-behavior-with-ama
Amazon SQS is engineered to provide “at least once” delivery of all messages in its queues. Although most of the time each message will be delivered to your application exactly once, you should design your system so that processing a message more than once does not create any errors or inconsistencies.
https://docs.microsoft.com/en-us/stream-analytics-query/event-delivery-guarantees-azure-stream-analytics
Dec 17, 2018 · Exactly-once delivery guarantee means all outputs from exactly-once processing are delivered to the output sink exactly once, so there is no duplicate output. This requires transactional capabilities on the output adaptor to be achieved. Azure Stream Analytics guarantes at-least-once delivery to output sinks, which guarantees that all results ...
https://medium.com/@jaykreps/exactly-once-one-more-time-901181d592f9
Jul 29, 2017 · First he addresses the meaning of the word “delivery” in exactly-once delivery and asserts that it must be an application defined thing and can’t be purely supplied by the message transport ...
https://medium.com/@jaykreps/exactly-once-support-in-apache-kafka-55e1fdd0a35f
Jul 02, 2017 · Exactly-once Support in Apache Kafka ... To my mind this is what people mean by exactly-once delivery in the context of pub/sub messaging: namely that you can publish messages and they will be ...
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