ZOOKEEPER-4933: Fixed the issue where all connections were rejected when there were no requests for a long time

Author: 九尘

zookeeper-server/src/main/java/org/apache/zookeeper/server/BlueThrottle.java

@@ -323,6 +323,7 @@ public synchronized boolean checkLimit(int need) {
 
         long now = Time.currentElapsedTime();
         long diff = now - lastTime;
+        diff = Math.min((long) maxTokens * fillTime / fillCount, diff);
 
         if (diff > fillTime) {
             int refill = (int) (diff * fillCount / fillTime);