Top‑K at Scale: Why Pre‑Aggregation Beats “Compute on Demand” in Interviews

Top‑K at Scale: Why Pre‑Aggregation Beats “Compute on Demand” When you design a Top‑K system for very high ingestion rates (e.g., 10M events/min), the key interview-worthy insight is simple: don't compute Top‑K at query time. Instead, pre‑aggregate i...