Revise · W08 · Day 4Late-Arriving Data and Correctness
5:00
Key ideaDay 4 · 1/10
Event time, not processing time
A purchase made at 14:30 on the subway reaches the server at 15:45, 75 minutes late. Windowed by processing time it lands in 15:00-16:00; by event time it lands in 14:00-15:00, where it happened.
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