real time driver heatmap for analytics dashboard. two views: 20 min near-realtime + 24h hourly buckets. ~500k TPS. geohash + redis sorted sets for hot, kafka -> spark structured streaming for the 24h aggregation, parquet on s3 for cold. feedback was lukewarm. tanked the followup on geohash precision tradeoffs

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Uber L5A sys design - aug

real time driver heatmap for analytics dashboard.