| /* |
| * 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.livy.examples; |
| |
| import java.io.File; |
| import java.net.URI; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.spark.api.java.function.Function; |
| import org.apache.spark.api.java.function.Function2; |
| |
| import org.apache.livy.*; |
| |
| class PiJob implements |
| Job<Double>, |
| Function<Integer, Integer>, |
| Function2<Integer, Integer, Integer> { |
| |
| private final int slices; |
| private final int samples; |
| |
| public PiJob(int slices) { |
| this.slices = slices; |
| this.samples = (int) Math.min(100000L * slices, Integer.MAX_VALUE); |
| } |
| |
| @Override |
| public Double call(JobContext ctx) throws Exception { |
| List<Integer> sampleList = new ArrayList<>(); |
| for (int i = 0; i < samples; i++) { |
| sampleList.add(i); |
| } |
| |
| return 4.0d * ctx.sc().parallelize(sampleList, slices).map(this).reduce(this) / samples; |
| } |
| |
| @Override |
| public Integer call(Integer v1) { |
| double x = Math.random() * 2 - 1; |
| double y = Math.random() * 2 - 1; |
| return (x * x + y * y < 1) ? 1 : 0; |
| } |
| |
| @Override |
| public Integer call(Integer v1, Integer v2) { |
| return v1 + v2; |
| } |
| } |
| |
| /** |
| * Example execution: |
| * java -cp /pathTo/spark-core_2.11-*version*.jar:/pathTo/livy-api-*version*.jar: |
| * /pathTo/livy-client-http-*version*.jar:/pathTo/livy-examples-*version*.jar |
| * org.apache.livy.examples.PiApp http://livy-host:8998 2 |
| */ |
| public class PiApp { |
| public static void main(String[] args) throws Exception { |
| if (args.length != 2) { |
| System.err.println("Usage: PiJob <livy url> <slices>"); |
| System.exit(-1); |
| } |
| |
| LivyClient client = new LivyClientBuilder() |
| .setURI(new URI(args[0])) |
| .build(); |
| |
| try { |
| System.out.println("Uploading livy-example jar to the SparkContext..."); |
| for (String s : System.getProperty("java.class.path").split(File.pathSeparator)) { |
| if (new File(s).getName().startsWith("livy-examples")) { |
| client.uploadJar(new File(s)).get(); |
| break; |
| } |
| } |
| |
| final int slices = Integer.parseInt(args[1]); |
| double pi = client.submit(new PiJob(slices)).get(); |
| |
| System.out.println("Pi is roughly " + pi); |
| } finally { |
| client.stop(true); |
| } |
| } |
| } |
| |