Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/22011#discussion_r208068968
--- Diff:
core/src/main/scala/org/apache/spark/api/java/JavaRDDBarrier.scala ---
@@ -0,0 +1,57 @@
+/*
+ * 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.api.java
+
+import scala.reflect.ClassTag
+
+import org.apache.spark.BarrierTaskContext
+import org.apache.spark.TaskContext
+import org.apache.spark.annotation.{Experimental, Since}
+import org.apache.spark.rdd.MapPartitionsRDD
+
+/**
+ * A Java-friendly version of [[org.apache.spark.rdd.RDDBarrier]] that
returns
+ * [[org.apache.spark.api.java.JavaRDD]]s.
+ *
+ * An RDD barrier turns an RDD into a barrier RDD, which forces Spark to
launch tasks of the stage
+ * contains this RDD together.
+ */
+class JavaRDDBarrier[T: ClassTag](javaRdd: JavaRDD[T]) {
--- End diff --
This is not necessary to implement Python support.
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