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 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