Absolutely Everything You Always Wanted to Know About Watermarks in Apache Flink - Part 1: Apache Flink
Summary
This Confluent blog post provides a deep dive into Apache Flink watermarks, covering what watermarks are, how they are generated at Kafka sources, and how they propagate through the Flink dataflow. It discusses idle partition detection, watermark alignment, and the relationship between watermarks and checkpoints, plus non-determinism considerations. Part 2 will cover Confluent Cloud extensions.