PithorAcademy Presents: Deep Dive

S7E12 | Apache Kafka Delivery Semantics: At Most Once, At Least Once & Exactly Once Explained


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In this episode of PithorAcademy Presents: Deep Dive, we break down Kafka Delivery Semantics—the rules that define how reliably messages are delivered in Apache Kafka. Choosing the wrong delivery guarantee can mean lost data, duplicates, or system failures.

We cover:

  • At-Most-Once Delivery – fastest but may drop messages

  • At-Least-Once Delivery – reliable but may cause duplicates

  • Exactly-Once Delivery (EOS) – strongest guarantee with trade-offs

  • Real-World Analogy – simplifying concepts with email delivery

By the end, you’ll clearly understand how Kafka ensures data consistency, fault tolerance, and business-critical reliability—and when to use each delivery mode in real-world systems.

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PithorAcademy Presents: Deep DiveBy PithorAcademy