COURSE 21 OF 22
Streaming and Event Time
Handle late events, replay, and the difference between a fast answer and a final answer.
Background reading
Introduction to Streaming and Event Time
A courier completes a delivery at 10:01, loses signal, and uploads the event at 10:08. The delivery belongs to the 10:01 business window even though the system receives it later.
Event time describes when something happened. Processing time describes when your system handles it. Streaming design starts by deciding which one the business question needs.
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