Java tutorial
/** * 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.hadoop.mapreduce.v2; import java.io.DataOutputStream; import java.io.File; import java.io.IOException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.CustomOutputCommitter; import org.apache.hadoop.FailMapper; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.fs.permission.FsPermission; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapred.FileInputFormat; import org.apache.hadoop.mapred.FileOutputFormat; import org.apache.hadoop.mapred.JobClient; import org.apache.hadoop.mapred.JobConf; import org.apache.hadoop.mapred.RunningJob; import org.apache.hadoop.mapred.TextInputFormat; import org.apache.hadoop.mapred.lib.IdentityMapper; import org.apache.hadoop.mapred.lib.IdentityReducer; import org.apache.hadoop.mapreduce.MRJobConfig; import org.apache.hadoop.mapreduce.filecache.DistributedCache; import org.junit.AfterClass; import org.junit.Assert; import org.junit.BeforeClass; import org.junit.Test; public class TestMROldApiJobs { private static final Log LOG = LogFactory.getLog(TestMROldApiJobs.class); protected static MiniMRYarnCluster mrCluster; private static Configuration conf = new Configuration(); private static FileSystem localFs; static { try { localFs = FileSystem.getLocal(conf); } catch (IOException io) { throw new RuntimeException("problem getting local fs", io); } } @BeforeClass public static void setup() throws IOException { if (!(new File(MiniMRYarnCluster.APPJAR)).exists()) { LOG.info("MRAppJar " + MiniMRYarnCluster.APPJAR + " not found. Not running test."); return; } if (mrCluster == null) { mrCluster = new MiniMRYarnCluster(TestMROldApiJobs.class.getName()); mrCluster.init(new Configuration()); mrCluster.start(); } // TestMRJobs is for testing non-uberized operation only; see TestUberAM // for corresponding uberized tests. mrCluster.getConfig().setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false); // Copy MRAppJar and make it private. TODO: FIXME. This is a hack to // workaround the absent public discache. localFs.copyFromLocalFile(new Path(MiniMRYarnCluster.APPJAR), TestMRJobs.APP_JAR); localFs.setPermission(TestMRJobs.APP_JAR, new FsPermission("700")); } @AfterClass public static void tearDown() { if (mrCluster != null) { mrCluster.stop(); mrCluster = null; } } @Test public void testJobSucceed() throws IOException, InterruptedException, ClassNotFoundException { LOG.info("\n\n\nStarting testJobSucceed()."); if (!(new File(MiniMRYarnCluster.APPJAR)).exists()) { LOG.info("MRAppJar " + MiniMRYarnCluster.APPJAR + " not found. Not running test."); return; } JobConf conf = new JobConf(mrCluster.getConfig()); Path in = new Path(mrCluster.getTestWorkDir().getAbsolutePath(), "in"); Path out = new Path(mrCluster.getTestWorkDir().getAbsolutePath(), "out"); runJobSucceed(conf, in, out); FileSystem fs = FileSystem.get(conf); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.JOB_SETUP_FILE_NAME))); Assert.assertFalse(fs.exists(new Path(out, CustomOutputCommitter.JOB_ABORT_FILE_NAME))); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.JOB_COMMIT_FILE_NAME))); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.TASK_SETUP_FILE_NAME))); Assert.assertFalse(fs.exists(new Path(out, CustomOutputCommitter.TASK_ABORT_FILE_NAME))); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.TASK_COMMIT_FILE_NAME))); } @Test public void testJobFail() throws IOException, InterruptedException, ClassNotFoundException { LOG.info("\n\n\nStarting testJobFail()."); if (!(new File(MiniMRYarnCluster.APPJAR)).exists()) { LOG.info("MRAppJar " + MiniMRYarnCluster.APPJAR + " not found. Not running test."); return; } JobConf conf = new JobConf(mrCluster.getConfig()); Path in = new Path(mrCluster.getTestWorkDir().getAbsolutePath(), "fail-in"); Path out = new Path(mrCluster.getTestWorkDir().getAbsolutePath(), "fail-out"); runJobFail(conf, in, out); FileSystem fs = FileSystem.get(conf); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.JOB_SETUP_FILE_NAME))); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.JOB_ABORT_FILE_NAME))); Assert.assertFalse(fs.exists(new Path(out, CustomOutputCommitter.JOB_COMMIT_FILE_NAME))); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.TASK_SETUP_FILE_NAME))); Assert.assertTrue(fs.exists(new Path(out, CustomOutputCommitter.TASK_ABORT_FILE_NAME))); Assert.assertFalse(fs.exists(new Path(out, CustomOutputCommitter.TASK_COMMIT_FILE_NAME))); } //Run a job that will be failed and wait until it completes public static void runJobFail(JobConf conf, Path inDir, Path outDir) throws IOException, InterruptedException { conf.setJobName("test-job-fail"); conf.setMapperClass(FailMapper.class); conf.setJarByClass(FailMapper.class); conf.setReducerClass(IdentityReducer.class); conf.setMaxMapAttempts(1); boolean success = runJob(conf, inDir, outDir, 1, 0); Assert.assertFalse("Job expected to fail succeeded", success); } //Run a job that will be succeeded and wait until it completes public static void runJobSucceed(JobConf conf, Path inDir, Path outDir) throws IOException, InterruptedException { conf.setJobName("test-job-succeed"); conf.setMapperClass(IdentityMapper.class); //conf.setJar(new File(MiniMRYarnCluster.APPJAR).getAbsolutePath()); conf.setReducerClass(IdentityReducer.class); boolean success = runJob(conf, inDir, outDir, 1, 1); Assert.assertTrue("Job expected to succeed failed", success); } static boolean runJob(JobConf conf, Path inDir, Path outDir, int numMaps, int numReds) throws IOException, InterruptedException { FileSystem fs = FileSystem.get(conf); if (fs.exists(outDir)) { fs.delete(outDir, true); } if (!fs.exists(inDir)) { fs.mkdirs(inDir); } String input = "The quick brown fox\n" + "has many silly\n" + "red fox sox\n"; for (int i = 0; i < numMaps; ++i) { DataOutputStream file = fs.create(new Path(inDir, "part-" + i)); file.writeBytes(input); file.close(); } DistributedCache.addFileToClassPath(TestMRJobs.APP_JAR, conf, fs); conf.setOutputCommitter(CustomOutputCommitter.class); conf.setInputFormat(TextInputFormat.class); conf.setOutputKeyClass(LongWritable.class); conf.setOutputValueClass(Text.class); FileInputFormat.setInputPaths(conf, inDir); FileOutputFormat.setOutputPath(conf, outDir); conf.setNumMapTasks(numMaps); conf.setNumReduceTasks(numReds); JobClient jobClient = new JobClient(conf); RunningJob job = jobClient.submitJob(conf); return jobClient.monitorAndPrintJob(conf, job); } }