[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 | |
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| 19 | package org.apache.hadoop.mapred; |
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| 20 | |
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| 21 | import java.io.File; |
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| 22 | import java.io.IOException; |
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| 23 | import java.net.URI; |
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| 24 | |
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| 25 | import junit.framework.TestCase; |
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| 26 | |
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| 27 | import org.apache.commons.logging.Log; |
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| 28 | import org.apache.commons.logging.LogFactory; |
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| 29 | import org.apache.hadoop.conf.Configuration; |
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| 30 | import org.apache.hadoop.fs.FileStatus; |
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| 31 | import org.apache.hadoop.fs.FileSystem; |
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| 32 | import org.apache.hadoop.fs.Path; |
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| 33 | import org.apache.hadoop.io.IntWritable; |
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| 34 | import org.apache.hadoop.io.Text; |
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| 35 | import org.apache.hadoop.mapred.lib.IdentityMapper; |
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| 36 | import org.apache.hadoop.mapred.lib.IdentityReducer; |
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| 37 | |
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| 38 | /** |
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| 39 | * A JUnit test to test Map-Reduce empty jobs. |
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| 40 | */ |
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| 41 | public class TestEmptyJob extends TestCase { |
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| 42 | private static final Log LOG = |
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| 43 | LogFactory.getLog(TestEmptyJob.class.getName()); |
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| 44 | |
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| 45 | private static String TEST_ROOT_DIR = |
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| 46 | new File(System.getProperty("test.build.data", "/tmp")).toURI() |
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| 47 | .toString().replace(' ', '+'); |
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| 48 | |
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| 49 | MiniMRCluster mr = null; |
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| 50 | |
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| 51 | /** Committer with cleanup waiting on a signal |
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| 52 | */ |
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| 53 | static class CommitterWithDelayCleanup extends FileOutputCommitter { |
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| 54 | @Override |
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| 55 | public void cleanupJob(JobContext context) throws IOException { |
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| 56 | Configuration conf = context.getConfiguration(); |
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| 57 | Path share = new Path(conf.get("share")); |
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| 58 | FileSystem fs = FileSystem.get(conf); |
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| 59 | |
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| 60 | |
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| 61 | while (true) { |
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| 62 | if (fs.exists(share)) { |
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| 63 | break; |
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| 64 | } |
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| 65 | UtilsForTests.waitFor(100); |
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| 66 | } |
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| 67 | super.cleanupJob(context); |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | /** |
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| 72 | * Simple method running a MapReduce job with no input data. Used to test that |
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| 73 | * such a job is successful. |
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| 74 | * |
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| 75 | * @param fileSys |
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| 76 | * @param numMaps |
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| 77 | * @param numReduces |
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| 78 | * @return true if the MR job is successful, otherwise false |
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| 79 | * @throws IOException |
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| 80 | */ |
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| 81 | private boolean launchEmptyJob(URI fileSys, int numMaps, int numReduces) |
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| 82 | throws IOException { |
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| 83 | // create an empty input dir |
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| 84 | final Path inDir = new Path(TEST_ROOT_DIR, "testing/empty/input"); |
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| 85 | final Path outDir = new Path(TEST_ROOT_DIR, "testing/empty/output"); |
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| 86 | final Path inDir2 = new Path(TEST_ROOT_DIR, "testing/dummy/input"); |
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| 87 | final Path outDir2 = new Path(TEST_ROOT_DIR, "testing/dummy/output"); |
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| 88 | final Path share = new Path(TEST_ROOT_DIR, "share"); |
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| 89 | |
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| 90 | JobConf conf = mr.createJobConf(); |
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| 91 | FileSystem fs = FileSystem.get(fileSys, conf); |
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| 92 | fs.delete(new Path(TEST_ROOT_DIR), true); |
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| 93 | fs.delete(outDir, true); |
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| 94 | if (!fs.mkdirs(inDir)) { |
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| 95 | LOG.warn("Can't create " + inDir); |
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| 96 | return false; |
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| 97 | } |
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| 98 | |
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| 99 | // use WordCount example |
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| 100 | FileSystem.setDefaultUri(conf, fileSys); |
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| 101 | conf.setJobName("empty"); |
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| 102 | // use an InputFormat which returns no split |
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| 103 | conf.setInputFormat(EmptyInputFormat.class); |
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| 104 | conf.setOutputCommitter(CommitterWithDelayCleanup.class); |
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| 105 | conf.setOutputKeyClass(Text.class); |
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| 106 | conf.setOutputValueClass(IntWritable.class); |
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| 107 | conf.setMapperClass(IdentityMapper.class); |
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| 108 | conf.setReducerClass(IdentityReducer.class); |
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| 109 | FileInputFormat.setInputPaths(conf, inDir); |
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| 110 | FileOutputFormat.setOutputPath(conf, outDir); |
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| 111 | conf.setNumMapTasks(numMaps); |
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| 112 | conf.setNumReduceTasks(numReduces); |
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| 113 | conf.set("share", share.toString()); |
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| 114 | |
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| 115 | // run job and wait for completion |
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| 116 | JobClient jc = new JobClient(conf); |
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| 117 | RunningJob runningJob = jc.submitJob(conf); |
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| 118 | JobInProgress job = mr.getJobTrackerRunner().getJobTracker().getJob(runningJob.getID()); |
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| 119 | |
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| 120 | while (true) { |
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| 121 | if (job.isCleanupLaunched()) { |
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| 122 | LOG.info("Waiting for cleanup to be launched for job " |
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| 123 | + runningJob.getID()); |
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| 124 | break; |
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| 125 | } |
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| 126 | UtilsForTests.waitFor(100); |
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| 127 | } |
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| 128 | |
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| 129 | // submit another job so that the map load increases and scheduling happens |
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| 130 | LOG.info("Launching dummy job "); |
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| 131 | RunningJob dJob = null; |
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| 132 | try { |
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| 133 | JobConf dConf = new JobConf(conf); |
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| 134 | dConf.setOutputCommitter(FileOutputCommitter.class); |
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| 135 | dJob = UtilsForTests.runJob(dConf, inDir2, outDir2, 2, 0); |
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| 136 | } catch (Exception e) { |
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| 137 | LOG.info("Exception ", e); |
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| 138 | throw new IOException(e); |
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| 139 | } |
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| 140 | |
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| 141 | while (true) { |
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| 142 | LOG.info("Waiting for job " + dJob.getID() + " to complete"); |
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| 143 | try { |
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| 144 | Thread.sleep(100); |
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| 145 | } catch (InterruptedException e) { |
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| 146 | } |
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| 147 | if (dJob.isComplete()) { |
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| 148 | break; |
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| 149 | } |
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| 150 | } |
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| 151 | |
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| 152 | // check if the second job is successful |
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| 153 | assertTrue(dJob.isSuccessful()); |
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| 154 | |
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| 155 | // signal the cleanup |
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| 156 | fs.create(share).close(); |
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| 157 | |
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| 158 | while (true) { |
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| 159 | LOG.info("Waiting for job " + runningJob.getID() + " to complete"); |
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| 160 | try { |
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| 161 | Thread.sleep(100); |
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| 162 | } catch (InterruptedException e) { |
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| 163 | } |
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| 164 | if (runningJob.isComplete()) { |
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| 165 | break; |
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| 166 | } |
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| 167 | } |
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| 168 | |
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| 169 | assertTrue(runningJob.isComplete()); |
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| 170 | assertTrue(runningJob.isSuccessful()); |
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| 171 | JobID jobID = runningJob.getID(); |
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| 172 | |
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| 173 | TaskReport[] jobSetupTasks = jc.getSetupTaskReports(jobID); |
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| 174 | assertTrue("Number of job-setup tips is not 2!", jobSetupTasks.length == 2); |
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| 175 | assertTrue("Setup progress is " + runningJob.setupProgress() |
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| 176 | + " and not 1.0", runningJob.setupProgress() == 1.0); |
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| 177 | assertTrue("Setup task is not finished!", mr.getJobTrackerRunner() |
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| 178 | .getJobTracker().getJob(jobID).isSetupFinished()); |
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| 179 | |
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| 180 | assertTrue("Number of maps is not zero!", jc.getMapTaskReports(runningJob |
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| 181 | .getID()).length == 0); |
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| 182 | assertTrue( |
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| 183 | "Map progress is " + runningJob.mapProgress() + " and not 1.0!", |
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| 184 | runningJob.mapProgress() == 1.0); |
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| 185 | |
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| 186 | assertTrue("Reduce progress is " + runningJob.reduceProgress() |
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| 187 | + " and not 1.0!", runningJob.reduceProgress() == 1.0); |
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| 188 | assertTrue("Number of reduces is not " + numReduces, jc |
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| 189 | .getReduceTaskReports(runningJob.getID()).length == numReduces); |
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| 190 | |
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| 191 | TaskReport[] jobCleanupTasks = jc.getCleanupTaskReports(jobID); |
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| 192 | assertTrue("Number of job-cleanup tips is not 2!", |
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| 193 | jobCleanupTasks.length == 2); |
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| 194 | assertTrue("Cleanup progress is " + runningJob.cleanupProgress() |
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| 195 | + " and not 1.0", runningJob.cleanupProgress() == 1.0); |
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| 196 | |
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| 197 | assertTrue("Job output directory doesn't exit!", fs.exists(outDir)); |
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| 198 | FileStatus[] list = fs.listStatus(outDir, new OutputLogFilter()); |
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| 199 | assertTrue("Number of part-files is " + list.length + " and not " |
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| 200 | + numReduces, list.length == numReduces); |
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| 201 | |
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| 202 | // cleanup |
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| 203 | fs.delete(outDir, true); |
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| 204 | |
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| 205 | // return job result |
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| 206 | LOG.info("job is complete: " + runningJob.isSuccessful()); |
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| 207 | return (runningJob.isSuccessful()); |
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| 208 | } |
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| 209 | |
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| 210 | /** |
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| 211 | * Test that a job with no input data (and thus with no input split and no map |
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| 212 | * task to execute) is successful. |
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| 213 | * |
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| 214 | * @throws IOException |
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| 215 | */ |
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| 216 | public void testEmptyJob() |
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| 217 | throws IOException { |
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| 218 | FileSystem fileSys = null; |
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| 219 | try { |
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| 220 | final int taskTrackers = 2; |
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| 221 | JobConf conf = new JobConf(); |
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| 222 | fileSys = FileSystem.get(conf); |
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| 223 | |
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| 224 | conf.set("mapred.job.tracker.handler.count", "1"); |
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| 225 | conf.set("mapred.job.tracker", "127.0.0.1:0"); |
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| 226 | conf.set("mapred.job.tracker.http.address", "127.0.0.1:0"); |
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| 227 | conf.set("mapred.task.tracker.http.address", "127.0.0.1:0"); |
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| 228 | |
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| 229 | mr = |
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| 230 | new MiniMRCluster(taskTrackers, fileSys.getUri().toString(), 1, |
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| 231 | null, null, conf); |
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| 232 | |
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| 233 | assertTrue(launchEmptyJob(fileSys.getUri(), 3, 1)); |
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| 234 | assertTrue(launchEmptyJob(fileSys.getUri(), 0, 0)); |
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| 235 | } finally { |
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| 236 | if (fileSys != null) { |
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| 237 | fileSys.close(); |
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| 238 | } |
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| 239 | if (mr != null) { |
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| 240 | mr.shutdown(); |
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| 241 | } |
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| 242 | } |
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| 243 | } |
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| 244 | } |
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