[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.mapred; |
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| 19 | |
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| 20 | import org.apache.hadoop.fs.*; |
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| 21 | import org.apache.hadoop.io.*; |
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| 22 | import org.apache.hadoop.mapred.UtilsForTests.RandomInputFormat; |
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| 23 | |
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| 24 | import junit.framework.TestCase; |
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| 25 | import java.io.*; |
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| 26 | import java.util.*; |
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| 27 | |
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| 28 | /** |
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| 29 | * TestCollect checks if the collect can handle simultaneous invocations. |
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| 30 | */ |
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| 31 | public class TestCollect extends TestCase |
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| 32 | { |
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| 33 | final static Path OUTPUT_DIR = new Path("build/test/test.collect.output"); |
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| 34 | static final int NUM_FEEDERS = 10; |
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| 35 | static final int NUM_COLLECTS_PER_THREAD = 1000; |
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| 36 | |
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| 37 | /** |
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| 38 | * Map is a Mapper that spawns threads which simultaneously call collect. |
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| 39 | * Each thread has a specific range to write to the buffer and is unique to |
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| 40 | * the thread. This is a synchronization test for the map's collect. |
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| 41 | */ |
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| 42 | |
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| 43 | static class Map |
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| 44 | implements Mapper<Text, Text, IntWritable, IntWritable> { |
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| 45 | |
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| 46 | public void configure(JobConf job) { |
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| 47 | } |
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| 48 | |
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| 49 | public void map(Text key, Text val, |
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| 50 | final OutputCollector<IntWritable, IntWritable> out, |
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| 51 | Reporter reporter) throws IOException { |
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| 52 | // Class for calling collect in separate threads |
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| 53 | class CollectFeeder extends Thread { |
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| 54 | int id; // id for the thread |
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| 55 | |
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| 56 | public CollectFeeder(int id) { |
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| 57 | this.id = id; |
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| 58 | } |
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| 59 | |
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| 60 | public void run() { |
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| 61 | for (int j = 1; j <= NUM_COLLECTS_PER_THREAD; j++) { |
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| 62 | try { |
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| 63 | out.collect(new IntWritable((id * NUM_COLLECTS_PER_THREAD) + j), |
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| 64 | new IntWritable(0)); |
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| 65 | } catch (IOException ioe) { } |
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| 66 | } |
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| 67 | } |
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| 68 | } |
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| 69 | |
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| 70 | CollectFeeder [] feeders = new CollectFeeder[NUM_FEEDERS]; |
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| 71 | |
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| 72 | // start the feeders |
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| 73 | for (int i = 0; i < NUM_FEEDERS; i++) { |
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| 74 | feeders[i] = new CollectFeeder(i); |
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| 75 | feeders[i].start(); |
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| 76 | } |
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| 77 | // wait for them to finish |
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| 78 | for (int i = 0; i < NUM_FEEDERS; i++) { |
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| 79 | try { |
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| 80 | feeders[i].join(); |
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| 81 | } catch (InterruptedException ie) { |
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| 82 | throw new IOException(ie.toString()); |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | public void close() { |
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| 88 | } |
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| 89 | } |
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| 90 | |
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| 91 | static class Reduce |
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| 92 | implements Reducer<IntWritable, IntWritable, IntWritable, IntWritable> { |
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| 93 | |
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| 94 | static int numSeen; |
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| 95 | static int actualSum; |
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| 96 | public void configure(JobConf job) { } |
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| 97 | |
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| 98 | public void reduce(IntWritable key, Iterator<IntWritable> val, |
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| 99 | OutputCollector<IntWritable, IntWritable> out, |
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| 100 | Reporter reporter) throws IOException { |
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| 101 | actualSum += key.get(); // keep the running count of the seen values |
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| 102 | numSeen++; // number of values seen so far |
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| 103 | |
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| 104 | // using '1+2+3+...n = n*(n+1)/2' to validate |
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| 105 | int expectedSum = numSeen * (numSeen + 1) / 2; |
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| 106 | if (expectedSum != actualSum) { |
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| 107 | throw new IOException("Collect test failed!! Ordering mismatch."); |
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| 108 | } |
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| 109 | } |
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| 110 | |
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| 111 | public void close() { } |
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| 112 | } |
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| 113 | |
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| 114 | public void configure(JobConf conf) throws IOException { |
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| 115 | conf.setJobName("TestCollect"); |
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| 116 | conf.setJarByClass(TestCollect.class); |
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| 117 | |
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| 118 | conf.setInputFormat(RandomInputFormat.class); // for self data generation |
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| 119 | conf.setOutputKeyClass(IntWritable.class); |
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| 120 | conf.setOutputValueClass(IntWritable.class); |
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| 121 | FileOutputFormat.setOutputPath(conf, OUTPUT_DIR); |
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| 122 | |
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| 123 | conf.setMapperClass(Map.class); |
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| 124 | conf.setReducerClass(Reduce.class); |
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| 125 | conf.setNumMapTasks(1); |
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| 126 | conf.setNumReduceTasks(1); |
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| 127 | } |
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| 128 | |
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| 129 | public void testCollect() throws IOException { |
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| 130 | JobConf conf = new JobConf(); |
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| 131 | configure(conf); |
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| 132 | try { |
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| 133 | JobClient.runJob(conf); |
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| 134 | // check if all the values were seen by the reducer |
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| 135 | if (Reduce.numSeen != (NUM_COLLECTS_PER_THREAD * NUM_FEEDERS)) { |
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| 136 | throw new IOException("Collect test failed!! Total does not match."); |
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| 137 | } |
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| 138 | } catch (IOException ioe) { |
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| 139 | throw ioe; |
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| 140 | } finally { |
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| 141 | FileSystem fs = FileSystem.get(conf); |
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| 142 | fs.delete(OUTPUT_DIR, true); |
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| 143 | } |
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| 144 | } |
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| 145 | |
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| 146 | public static void main(String[] args) throws IOException { |
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| 147 | new TestCollect().testCollect(); |
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| 148 | } |
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| 149 | } |
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| 150 | |
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