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Exactly-once Semantics is Possible: Here's How Apache Kafka Does it

Confluent Blog · published 26 September 2026

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What Is Apache Kafka®? Architecture, Use Cases, and How It Works Read at the source ↗

confluent.io

https://kafka.apache.org/downloads

kafka.apache.org

https://www.confluent.io/download

confluent.io

Transactions in Apache Kafka Read at the source ↗

confluent.io

https://docs.confluent.io/platform/current/streams/introduction.html

docs.confluent.io

Distributed Systems: An Introduction Read at the source ↗

confluent.io

Publish-Subscribe - Intro to Pub-Sub Messaging Read at the source ↗

confluent.io

Apache Kafka® Broker Failures & Other Outages Read at the source ↗

confluent.io

https://kafka-tutorials.confluent.io/message-ordering/kafka.html

kafka-tutorials.confluent.io

https://gist.github.com/nehanarkhede/6dd6f482c2091f36d2d55bd027ca6fc0

gist.github.com

Stream Processing: An Introduction Read at the source ↗

confluent.io

https://docs.google.com/document/d/11Jqy_GjUGtdXJK94XGsEIK7CP1SnQGdp2eF0wSw9ra8/edit

docs.google.com

https://issues.apache.org/jira/browse/KAFKA-5494

issues.apache.org

https://docs.google.com/spreadsheets/d/1dHY6M7qCiX-NFvsgvaE0YoVdNq26uA8608XIh_DUpI4/edit

docs.google.com

https://kafka.apache.org/documentation/

kafka.apache.org

Start for free on Confluent Cloud Read at the source ↗

confluent.io

Try Free Confluent: Managed Kafka on Any Cloud Read at the source ↗

confluent.io

https://cwiki.apache.org/confluence/display/KAFKA/KIP-98+-+Exactly+Once+Delivery+and+Transactional+Messaging

cwiki.apache.org

https://cwiki.apache.org/confluence/display/KAFKA/KIP-129%3A+Streams+Exactly-Once+Semantics

cwiki.apache.org

https://docs.google.com/document/d/1pGZ8xtOOyGwDYgH5vA6h19zOMMaduFK1DAB8_gBYA2c/edit

docs.google.com

Exactly-once Stream Processing with Kafka Streams Read at the source ↗

confluent.io