Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/21758#discussion_r204236923 --- Diff: core/src/test/scala/org/apache/spark/rdd/RDDBarrierSuite.scala --- @@ -0,0 +1,43 @@ +/* + * 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.rdd + +import org.apache.spark.{SharedSparkContext, SparkFunSuite} + +class RDDBarrierSuite extends SparkFunSuite with SharedSparkContext { + + test("create an RDDBarrier") { + val rdd = sc.parallelize(1 to 10, 4) + assert(rdd.isBarrier() === false) + + val rdd2 = rdd.barrier().mapPartitions((iter, context) => iter) + assert(rdd2.isBarrier() === true) + } + + test("create an RDDBarrier in the middle of a chain of RDDs") { --- End diff -- IIUC, an RDDBarrier is created at the first of a chain of RDDs instead of the middle.
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