WaterMarks

Watermarks determine how long the system should wait for out-of-order events.

Watermarks in Apache Flink are calculated from the largest event time that has been seen so far.

• Understanding Watermarks in Apache Flink | by Giannis Polyzos | Medium
• Watermark | Apache Flink
• Event Time and Watermarks | Apache Flink 101 - YouTube
• Windowing and Watermarks in Flink | Flink with Java - YouTube