hllpp

hllpp is an implementation of the HyperLogLog++ cardinality estimation algorithm in go. It optimizes for memory usage over CPU usage. It implements all the HyperLogLog optimizations introduced in the HyperLogLog++ paper (http://goo.gl/Z5Sqgu). Some notable features include:

• marshaling so you can serialize to your datastore
• extra space savings by only using 5 bits per register when possible
• built-in non-streaming murmur3 implementation for fast hashing of input data

Usage

h := hllpp.New()

h.Add([]byte("barclay"))
h.Add([]byte("reginald"))
h.Add([]byte("barclay"))
h.Add([]byte("broccoli"))

fmt.Println(h.Count())
// Output: 3

See the godocs for documentation and more examples.