Stream Processing Semantics: Time, State, and What Exactly-Once Actually Covers
In streaming, a number is never simply right. It is right as of a boundary you chose, over data that had arrived by then, and it may change tomorrow.
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Stream Windowing
A window is a group selected by event time, not a moment when something runs. Which shape you pick decides whether the numbers can be added up at all.
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Modeling Time: Three Clocks, History, and Corrections
“What was true then” and “what did we believe then” are different questions. See which clocks a model needs, and how corrections keep both answerable.