/* * 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.examples import java.util.Random import org.apache.spark.{SparkConf, SparkContext} import org.apache.spark.SparkContext._ /** * Usage: GroupByTest [numMappers] [numKVPairs] [KeySize] [numReducers] */ object GroupByTest { def main(args: Array[String]) { val sparkConf = new SparkConf().setAppName("GroupBy Test") var numMappers = if (args.length > 0) args(0).toInt else 2 var numKVPairs = if (args.length > 1) args(1).toInt else 1000 var valSize = if (args.length > 2) args(2).toInt else 1000 var numReducers = if (args.length > 3) args(3).toInt else numMappers val sc = new SparkContext(sparkConf) val pairs1 = sc.parallelize(0 until numMappers, numMappers).flatMap { p => val ranGen = new Random var arr1 = new Array[(Int, Array[Byte])](numKVPairs) for (i <- 0 until numKVPairs) { val byteArr = new Array[Byte](valSize) ranGen.nextBytes(byteArr) arr1(i) = (ranGen.nextInt(Int.MaxValue), byteArr) } arr1 }.cache() // Enforce that everything has been calculated and in cache pairs1.count() println(pairs1.groupByKey(numReducers).count()) sc.stop() } }