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Streams and Stuff

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?

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Streams and Stuff

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  1. Streams and Stuff Sirish and Sam and Mike

  2. 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)

  3. The Telegraph Engine • CACQ • 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 • Output window • 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

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