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 | |
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19 | package org.apache.hadoop.mapred; |
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20 | |
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21 | import junit.framework.TestCase; |
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22 | import java.io.IOException; |
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23 | |
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24 | import org.apache.commons.logging.Log; |
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25 | import org.apache.commons.logging.LogFactory; |
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26 | import org.apache.hadoop.conf.Configuration; |
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27 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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28 | import org.apache.hadoop.examples.PiEstimator; |
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29 | import org.apache.hadoop.fs.FileSystem; |
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30 | |
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31 | import org.apache.commons.logging.impl.Log4JLogger; |
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32 | import org.apache.log4j.Level; |
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33 | |
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34 | /** |
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35 | * A JUnit test to test configired task limits. |
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36 | */ |
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37 | public class TestTaskLimits extends TestCase { |
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38 | |
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39 | { |
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40 | ((Log4JLogger)JobInProgress.LOG).getLogger().setLevel(Level.ALL); |
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41 | } |
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42 | |
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43 | private static final Log LOG = |
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44 | LogFactory.getLog(TestMiniMRWithDFS.class.getName()); |
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45 | |
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46 | static final int NUM_MAPS = 5; |
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47 | static final int NUM_SAMPLES = 100; |
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48 | |
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49 | public static class TestResult { |
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50 | public String output; |
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51 | public RunningJob job; |
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52 | TestResult(RunningJob job, String output) { |
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53 | this.job = job; |
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54 | this.output = output; |
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55 | } |
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56 | } |
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57 | |
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58 | static void runPI(MiniMRCluster mr, JobConf jobconf) throws IOException { |
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59 | LOG.info("runPI"); |
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60 | double estimate = PiEstimator.estimate(NUM_MAPS, NUM_SAMPLES, jobconf).doubleValue(); |
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61 | double error = Math.abs(Math.PI - estimate); |
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62 | System.out.println("PI estimation " + error); |
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63 | } |
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64 | |
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65 | /** |
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66 | * Run the pi test with a specifix value of |
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67 | * mapred.jobtracker.maxtasks.per.job. Returns true if the job succeeded. |
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68 | */ |
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69 | private boolean runOneTest(int maxTasks) throws IOException { |
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70 | MiniDFSCluster dfs = null; |
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71 | MiniMRCluster mr = null; |
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72 | FileSystem fileSys = null; |
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73 | boolean success = false; |
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74 | try { |
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75 | final int taskTrackers = 2; |
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76 | |
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77 | Configuration conf = new Configuration(); |
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78 | conf.setInt("mapred.jobtracker.maxtasks.per.job", maxTasks); |
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79 | dfs = new MiniDFSCluster(conf, 4, true, null); |
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80 | fileSys = dfs.getFileSystem(); |
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81 | JobConf jconf = new JobConf(conf); |
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82 | mr = new MiniMRCluster(0, 0, taskTrackers, fileSys.getUri().toString(), 1, |
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83 | null, null, null, jconf); |
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84 | |
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85 | JobConf jc = mr.createJobConf(); |
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86 | try { |
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87 | runPI(mr, jc); |
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88 | success = true; |
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89 | } catch (IOException e) { |
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90 | success = false; |
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91 | } |
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92 | } finally { |
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93 | if (dfs != null) { dfs.shutdown(); } |
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94 | if (mr != null) { mr.shutdown(); } |
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95 | } |
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96 | return success; |
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97 | } |
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98 | |
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99 | public void testTaskLimits() throws IOException { |
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100 | |
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101 | System.out.println("Job 1 running with max set to 2"); |
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102 | boolean status = runOneTest(2); |
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103 | assertTrue(status == false); |
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104 | System.out.println("Job 1 failed as expected."); |
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105 | |
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106 | // verify that checking this limit works well. The job |
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107 | // needs 5 mappers and we set the limit to 7. |
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108 | System.out.println("Job 2 running with max set to 7."); |
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109 | status = runOneTest(7); |
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110 | assertTrue(status == true); |
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111 | System.out.println("Job 2 succeeded as expected."); |
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112 | |
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113 | System.out.println("Job 3 running with max disabled."); |
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114 | status = runOneTest(-1); |
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115 | assertTrue(status == true); |
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116 | System.out.println("Job 3 succeeded as expected."); |
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117 | } |
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118 | } |
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