What exactly is Uber running in its clusters? - Route Optimization - Demand Forecasting - Rider Hotspot Prediction This post doesn't exactly tell us the tru

What exactly is Uber running in its clusters? - Route Optimization - Demand Forecasting - Rider Hotspot Prediction This post doesn't exactly tell us the true nature of their workloads (other than the crude categorization - batch, stateful, stateless), nor does it talk about the inflection points where off-the-shelf solutions don't cut it anymore and such customization is required. I mean some before & after numbers / graphs on resource utilization would have really helped.