Big Data Technology & Architecture

Feb 15, 2020 · Big Data

Understanding Event Time and Watermarks in Apache Flink

This article explains how Apache Flink uses event‑time timestamps and watermarks to handle out‑of‑order and late data, describes the assignTimestampsAndWatermarks API with periodic and punctuated watermark assigners, and provides practical code examples for window lateness and side‑output handling.