This is an implementation of "Hokusai - Sketching Streams in Real Time" by Sergiy Matusevych, Alex Smola, Amr Ahmed
It maintains a time-series of count-min sketches, using aggregations to reduce the space (and accuracy) used by older sketches.
This paper is available on-line: http://www.auai.org/uai2012/papers/231.pdf
Alex Smola has given a number of lectures covering the ideas from the paper. Here is one recording: https://www.youtube.com/watch?v=FQoJV88ve0g
The 'sketch' library has all the algorithms from the paper. This is more or less complete. I've tested it (by 'inspection') during development. Proper tests and test data are at the top of my list of things to do.
The 'hokud' package is a simple server that exposes the sketch API. This is where development will focus, so there's an actual deployable solution instead of a package full of math.
This package relies heavily on https://github.com/dustin/go-probably for the count-min sketch implementation. The algorithms from the paper which depended on the internals of the count-min sketch implementation were added to go-probably instead of here.