controller: Reduce the frequency of printing logs (#8160) (#8190)

close #8159

Signed-off-by: nolouch <nolouch@gmail.com>

Co-authored-by: nolouch <nolouch@gmail.com>

client/resource_group/controller/limiter.go

@@ -330,6 +330,8 @@ func (lim *Limiter) AvailableTokens(now time.Time) float64 {
 	return tokens
 }
 
+const reserveWarnLogInterval = 10 * time.Millisecond
+
 // reserveN is a helper method for Reserve.
 // maxFutureReserve specifies the maximum reservation wait duration allowed.
 // reserveN returns Reservation, not *Reservation.
@@ -376,16 +378,19 @@ func (lim *Limiter) reserveN(now time.Time, n float64, maxFutureReserve time.Dur
 		lim.tokens = tokens
 		lim.maybeNotify()
 	} else {
-		log.Warn("[resource group controller] cannot reserve enough tokens",
-			zap.Duration("need-wait-duration", waitDuration),
-			zap.Duration("max-wait-duration", maxFutureReserve),
-			zap.Float64("current-ltb-tokens", lim.tokens),
-			zap.Float64("current-ltb-rate", float64(lim.limit)),
-			zap.Float64("request-tokens", n),
-			zap.Float64("notify-threshold", lim.notifyThreshold),
-			zap.Bool("is-low-process", lim.isLowProcess),
-			zap.Int64("burst", lim.burst),
-			zap.Int("remaining-notify-times", lim.remainingNotifyTimes))
+		// print log if the limiter cannot reserve for a while.
+		if time.Since(lim.last) > reserveWarnLogInterval {
+			log.Warn("[resource group controller] cannot reserve enough tokens",
+				zap.Duration("need-wait-duration", waitDuration),
+				zap.Duration("max-wait-duration", maxFutureReserve),
+				zap.Float64("current-ltb-tokens", lim.tokens),
+				zap.Float64("current-ltb-rate", float64(lim.limit)),
+				zap.Float64("request-tokens", n),
+				zap.Float64("notify-threshold", lim.notifyThreshold),
+				zap.Bool("is-low-process", lim.isLowProcess),
+				zap.Int64("burst", lim.burst),
+				zap.Int("remaining-notify-times", lim.remainingNotifyTimes))
+		}
 		lim.last = last
 		if lim.limit == 0 {
 			lim.notify()