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Flink Watermarks Are a Hidden Hyperparameter in Real-Time ML

TL;DR — A watermark in a Kafka and Flink pipeline decides how much of the world a real-time feature has seen when the model reads it. Training on a batch replay sees a more complete world than production did, which creates a directional, systematic skew. Treat lateness policy as a versioned model p…

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  1. 2026-11-10 14:15 · DEV Community — Machine Learning
    Flink Watermarks Are a Hidden Hyperparameter in Real-Time ML

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