How Flink+Kafka implements end-to-end consistent semantics

This article shows you how Flink+Kafka implements end-to-end consistent semantics. The content is concise and easy to understand, and it will definitely make your eyes shine. I hope you can get something through the detailed introduction of this article.

Apache Flink Community version 1.4 officially introduced a landmark feature: two-phase commit Sink, or TwoPhaseCommitSinkFunction.

The SinkFunction extracts and encapsulates the common logic in the two-phase commit protocol, making it possible for Flink to build precise one-time processing semantics (exactly-once semantics) applications with specific Source and Sink. As an abstract class, TwoPhaseCommitSinkFunction provides an abstraction layer for users to implement specific methods to support Exactly-Once semantics.

Next, let's take a closer look at this feature of flink:

The role of Flink's checkpoints in ensuring exactly-once semantics

How does Flink guarantee exactly-once semantics from data source to data output through two-phase commit protocol

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