merlimat commented on a change in pull request #634: PIP-3 : Introduce 
message-dispatch rate limiting

 File path: 
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+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.common.util;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import static;
+ * 
+ * A Rate Limiter that distributes permits at a configurable rate. Each {@link 
#acquire()} blocks if necessary until a
+ * permit is available, and then takes it. Each {@link #tryAcquire()} tries to 
acquire permits from available permits,
+ * it returns true if it succeed else returns false. Rate limiter release 
configured permits at every configured rate
+ * time, so, on next ticket new fresh permits will be available.
+ * <p>
+ * For example: if RateLimiter is configured to release 10 permits at every 1 
second then RateLimiter will allow to
+ * acquire 10 permits at any time with in that 1 second.
+ *
+ */
+public class RateLimiter {
 Review comment:
   How is this class different from Guava rate limiter?
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