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fix data race when accessing h.sum during histogram marshaling

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This commit is contained in:
Aliaksandr Valialkin 2020-03-13 12:36:02 +02:00
parent 93f7956e2a
commit f6ff0f32a2
1 changed files with 11 additions and 3 deletions
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14
histogram.go
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@ -246,14 +246,22 @@ func (h *Histogram) marshalTo(prefix string, w io.Writer) {
return
}
name, filters := splitMetricName(prefix)
if float64(int64(h.sum)) == h.sum {
fmt.Fprintf(w, "%s_sum%s %d\n", name, filters, int64(h.sum))
sum := h.getSum()
if float64(int64(sum)) == sum {
fmt.Fprintf(w, "%s_sum%s %d\n", name, filters, int64(sum))
} else {
fmt.Fprintf(w, "%s_sum%s %g\n", name, filters, h.sum)
fmt.Fprintf(w, "%s_sum%s %g\n", name, filters, sum)
}
fmt.Fprintf(w, "%s_count%s %d\n", name, filters, countTotal)
}
func (h *Histogram) getSum() float64 {
h.mu.Lock()
sum := h.sum
h.mu.Unlock()
return sum
}
func getBucketIdxAndOffset(v float64) (int, uint) {
if v < 0 {
panic(fmt.Errorf("BUG: v must be positive; got %g", v))