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hyperloglog_demo.go
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/
hyperloglog_demo.go
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package main
import (
"fmt"
"strconv"
"github.com/axiomhq/hyperloglog"
"github.com/influxdata/influxdb/pkg/estimator/hll"
)
func estimateError(got, exp uint64) float64 {
var delta uint64
if got > exp {
delta = got - exp
} else {
delta = exp - got
}
return float64(delta) / float64(exp)
}
func main() {
axiom := hyperloglog.New16()
influx, err := hll.NewPlus(14)
if err != nil {
panic(err)
}
step := 10
unique := map[string]bool{}
for i := 1; len(unique) <= 10000000; i++ {
str := "stream-" + strconv.Itoa(i)
axiom.Insert([]byte(str))
influx.Add([]byte(str))
unique[str] = true
if len(unique)%step == 0 || len(unique) == 10000000 {
step *= 5
exact := uint64(len(unique))
res := axiom.Estimate()
ratio := 100 * estimateError(res, exact)
res2 := influx.Count()
ratio2 := 100 * estimateError(res2, exact)
fmt.Printf("Exact %d, got:\n\t axiom HLL %d (%.4f%% off)\n\tinflux HLL++ %d (%.4f%% off)\n", exact, res, ratio, res2, ratio2)
}
}
data1, err := influx.MarshalBinary()
if err != nil {
panic(err)
}
data2, err := axiom.MarshalBinary()
if err != nil {
panic(err)
}
fmt.Println("AxiomHQ HLL total size:\t", len(data2))
fmt.Println("InfluxData HLL++ total size:\t", len(data1))
}