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clarify

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Signed-off-by: Dieter Plaetinck <dieter@grafana.com>
This commit is contained in:
Dieter Plaetinck 2021-07-02 18:37:40 +03:00
parent 2b2f838a56
commit bef872bf3c
1 changed files with 12 additions and 0 deletions
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12
pkg/histogram/sparse_histogram.go
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@ -17,6 +17,18 @@ import (
"math" "math"
) )
// SparseHistogram encodes a sparse histogram
// full details: https://docs.google.com/document/d/1cLNv3aufPZb3fNfaJgdaRBZsInZKKIHo9E6HinJVbpM/edit#
// the most tricky bit is how bucket indices represent real bucket boundaries
//
// an example for schema 0 (which doubles the size of consecutive buckets):
//
// buckets syntax (LE,GE) (-2,-1) (-1,-0.5) (-0.5,-0.25) ... (-0.001-0.001) ... (0.25-0.5)(0.5-1) (1-2) ....
// ^
// zero bucket (here width a width of 0.001) ZB
// pos bucket idx ... -1 0 1 2 3
// neg bucket idx 3 2 1 0 -1 ...
// actively used bucket indices themselves are represented by the spans
type SparseHistogram struct { type SparseHistogram struct {
Count, ZeroCount uint64 Count, ZeroCount uint64
Sum, ZeroThreshold float64 Sum, ZeroThreshold float64