Tweak backoff

internal/internal.go

@@ -6,20 +6,17 @@ import (
 	"golang.org/x/exp/rand"
 )
 
-// Retry backoff with jitter sleep to prevent overloaded conditions during intervals
-// https://www.awsarchitectureblog.com/2015/03/backoff.html
 func RetryBackoff(retry int, minBackoff, maxBackoff time.Duration) time.Duration {
 	if retry < 0 {
-		retry = 0
+		panic("not reached")
 	}
 
-	backoff := minBackoff << uint(retry)
-	if backoff > maxBackoff || backoff < minBackoff {
-		backoff = maxBackoff
+	d := minBackoff << uint(retry)
+	d = minBackoff + time.Duration(rand.Int63n(int64(d)))
+
+	if d > maxBackoff || d < minBackoff {
+		d = maxBackoff
 	}
 
-	if backoff == 0 {
-		return 0
-	}
-	return time.Duration(rand.Int63n(int64(backoff)))
+	return d
 }