Streams and Stuff Sirish and Sam and Mike.

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Streams and Stuff Sirish and Sam and Mike

Streaming Considerations Lifetime: Instantaneous vs. Standing Delivery: All-the-time, periodic, on-demand (deltas?) Append Only With windows Units: tuples, time, or punctuations Endpoints: fixed, moving, or both? “NOW” keyword: relative to when? Update-in-place Do time windows make sense? Sensor “knobs” OK to combine values from different epochs? CONTROL: prioritize groups, sensors. Interactivity Accuracy (e.g. confidence intervals, counts, percentages)

The Telegraph Engine CACQ PSoup Sensors All-the-time delivery Output window Left edge fixed at time of query Therefore, results never invalidated Right edge sliding, = NOW Band Joins PSoup On demand delivery Endpoints sliding or fixed Band Joins in Main Memory Implementation Sensors On-demand (instantaneous) or periodic delivery Sample rate = GCD of delivery rates Combine Values from Different Epochs