Yes, you can have exactly-once delivery - https://news.ycombinator.com/item?id=41598006 - Sept 2024 (133 comments)
Also. Others?
You cannot have exactly-once delivery (2015) - https://news.ycombinator.com/item?id=34986691 - March 2023 (217 comments)
Show HN: Exactly-once delivery counter using Watermill messaging library - https://news.ycombinator.com/item?id=26888303 - April 2021 (9 comments)
High-performance, exactly-once, failure-oblivious distributed programming (2018) - https://news.ycombinator.com/item?id=20562733 - July 2019 (26 comments)
Exactly-once Semantics: How Kafka Does it - https://news.ycombinator.com/item?id=14670801 - June 2017 (39 comments)
Delivering Billions of Messages Exactly Once - https://news.ycombinator.com/item?id=14664405 - June 2017 (133 comments)
You Cannot Have Exactly-Once Delivery - https://news.ycombinator.com/item?id=9266725 - March 2015 (55 comments)
Exactly-Once Messaging in Kafka - https://news.ycombinator.com/item?id=8880612 - Jan 2015 (8 comments)
Exactly-Once Delivery May Not Be What You Want - https://news.ycombinator.com/item?id=8614264 - Nov 2014 (10 comments)
Yes, you can have exactly-once delivery - https://news.ycombinator.com/item?id=41598006 - Sept 2024 (133 comments)
Also. Others?
You cannot have exactly-once delivery (2015) - https://news.ycombinator.com/item?id=34986691 - March 2023 (217 comments)
Show HN: Exactly-once delivery counter using Watermill messaging library - https://news.ycombinator.com/item?id=26888303 - April 2021 (9 comments)
High-performance, exactly-once, failure-oblivious distributed programming (2018) - https://news.ycombinator.com/item?id=20562733 - July 2019 (26 comments)
Exactly-once Semantics: How Kafka Does it - https://news.ycombinator.com/item?id=14670801 - June 2017 (39 comments)
Delivering Billions of Messages Exactly Once - https://news.ycombinator.com/item?id=14664405 - June 2017 (133 comments)
You Cannot Have Exactly-Once Delivery - https://news.ycombinator.com/item?id=9266725 - March 2015 (55 comments)
Exactly-Once Messaging in Kafka - https://news.ycombinator.com/item?id=8880612 - Jan 2015 (8 comments)
Exactly-Once Delivery May Not Be What You Want - https://news.ycombinator.com/item?id=8614264 - Nov 2014 (10 comments)