Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/945#discussion_r14792414
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/RateLimiter.scala
---
@@ -0,0 +1,68 @@
+/*
+ * 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
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.streaming.receiver
+
+import org.apache.spark.{Logging, SparkConf}
+import java.util.concurrent.TimeUnit._
+
+/** Provides waitToPush() method to limit the rate at which receivers
consume data.
+ *
+ * waitToPush method will block the thread if too many messages have been
pushed too quickly, and only return when a
+ * new message has been pushed. It assumes that only one message is
pushed at a time.
+ *
+ * The spark configuration spark.streaming.receiver.maxRate gives the
maximum number of messages per second that each
+ * receiver will accept.
+ *
+ * @param conf spark configuration
+ */
+abstract class RateLimiter(conf: SparkConf) extends Logging {
--- End diff --
make this `private[receiver]`
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