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HADOOP-5850. Fixes a problem to do with not being able to jobs with 0…
… maps/reduces. Contributed by Vinod K V. git-svn-id: https://svn.eu.apache.org/repos/asf/hadoop/core/branches/branch-0.20@777575 13f79535-47bb-0310-9956-ffa450edef68
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Devaraj Das
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May 22, 2009
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| /** | ||
| * 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.mapred; | ||
|
|
||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.net.URI; | ||
|
|
||
| import junit.framework.TestCase; | ||
|
|
||
| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
| import org.apache.hadoop.fs.FileStatus; | ||
| import org.apache.hadoop.fs.FileSystem; | ||
| import org.apache.hadoop.fs.Path; | ||
| import org.apache.hadoop.io.IntWritable; | ||
| import org.apache.hadoop.io.Text; | ||
| import org.apache.hadoop.mapred.lib.IdentityMapper; | ||
| import org.apache.hadoop.mapred.lib.IdentityReducer; | ||
|
|
||
| /** | ||
| * A JUnit test to test Map-Reduce empty jobs. | ||
| */ | ||
| public class TestEmptyJob extends TestCase { | ||
| private static final Log LOG = | ||
| LogFactory.getLog(TestEmptyJob.class.getName()); | ||
|
|
||
| private static String TEST_ROOT_DIR = | ||
| new File(System.getProperty("test.build.data", "/tmp")).toURI() | ||
| .toString().replace(' ', '+'); | ||
|
|
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| MiniMRCluster mr = null; | ||
|
|
||
| /** | ||
| * Simple method running a MapReduce job with no input data. Used to test that | ||
| * such a job is successful. | ||
| * | ||
| * @param fileSys | ||
| * @param numMaps | ||
| * @param numReduces | ||
| * @return true if the MR job is successful, otherwise false | ||
| * @throws IOException | ||
| */ | ||
| private boolean launchEmptyJob(URI fileSys, int numMaps, int numReduces) | ||
| throws IOException { | ||
| // create an empty input dir | ||
| final Path inDir = new Path(TEST_ROOT_DIR, "testing/empty/input"); | ||
| final Path outDir = new Path(TEST_ROOT_DIR, "testing/empty/output"); | ||
| JobConf conf = mr.createJobConf(); | ||
| FileSystem fs = FileSystem.get(fileSys, conf); | ||
| fs.delete(outDir, true); | ||
| if (!fs.mkdirs(inDir)) { | ||
| LOG.warn("Can't create " + inDir); | ||
| return false; | ||
| } | ||
|
|
||
| // use WordCount example | ||
| FileSystem.setDefaultUri(conf, fileSys); | ||
| conf.setJobName("empty"); | ||
| // use an InputFormat which returns no split | ||
| conf.setInputFormat(EmptyInputFormat.class); | ||
| conf.setOutputKeyClass(Text.class); | ||
| conf.setOutputValueClass(IntWritable.class); | ||
| conf.setMapperClass(IdentityMapper.class); | ||
| conf.setReducerClass(IdentityReducer.class); | ||
| FileInputFormat.setInputPaths(conf, inDir); | ||
| FileOutputFormat.setOutputPath(conf, outDir); | ||
| conf.setNumMapTasks(numMaps); | ||
| conf.setNumReduceTasks(numReduces); | ||
|
|
||
| // run job and wait for completion | ||
| JobClient jc = new JobClient(conf); | ||
| RunningJob runningJob = jc.submitJob(conf); | ||
| while (true) { | ||
| try { | ||
| Thread.sleep(100); | ||
| } catch (InterruptedException e) { | ||
| } | ||
| if (runningJob.isComplete()) { | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| assertTrue(runningJob.isComplete()); | ||
| assertTrue(runningJob.isSuccessful()); | ||
| JobID jobID = runningJob.getID(); | ||
|
|
||
| TaskReport[] jobSetupTasks = jc.getSetupTaskReports(jobID); | ||
| assertTrue("Number of job-setup tips is not 2!", jobSetupTasks.length == 2); | ||
| assertTrue("Setup progress is " + runningJob.setupProgress() | ||
| + " and not 1.0", runningJob.setupProgress() == 1.0); | ||
| assertTrue("Setup task is not finished!", mr.getJobTrackerRunner() | ||
| .getJobTracker().getJob(jobID).isSetupFinished()); | ||
|
|
||
| assertTrue("Number of maps is not zero!", jc.getMapTaskReports(runningJob | ||
| .getID()).length == 0); | ||
| assertTrue( | ||
| "Map progress is " + runningJob.mapProgress() + " and not 1.0!", | ||
| runningJob.mapProgress() == 1.0); | ||
|
|
||
| assertTrue("Reduce progress is " + runningJob.reduceProgress() | ||
| + " and not 1.0!", runningJob.reduceProgress() == 1.0); | ||
| assertTrue("Number of reduces is not " + numReduces, jc | ||
| .getReduceTaskReports(runningJob.getID()).length == numReduces); | ||
|
|
||
| TaskReport[] jobCleanupTasks = jc.getCleanupTaskReports(jobID); | ||
| assertTrue("Number of job-cleanup tips is not 2!", | ||
| jobCleanupTasks.length == 2); | ||
| assertTrue("Cleanup progress is " + runningJob.cleanupProgress() | ||
| + " and not 1.0", runningJob.cleanupProgress() == 1.0); | ||
|
|
||
| assertTrue("Job output directory doesn't exit!", fs.exists(outDir)); | ||
| FileStatus[] list = fs.listStatus(outDir, new OutputLogFilter()); | ||
| assertTrue("Number of part-files is " + list.length + " and not " | ||
| + numReduces, list.length == numReduces); | ||
|
|
||
| // cleanup | ||
| fs.delete(outDir, true); | ||
|
|
||
| // return job result | ||
| LOG.info("job is complete: " + runningJob.isSuccessful()); | ||
| return (runningJob.isSuccessful()); | ||
| } | ||
|
|
||
| /** | ||
| * Test that a job with no input data (and thus with no input split and no map | ||
| * task to execute) is successful. | ||
| * | ||
| * @throws IOException | ||
| */ | ||
| public void testEmptyJob() | ||
| throws IOException { | ||
| FileSystem fileSys = null; | ||
| try { | ||
| final int taskTrackers = 1; | ||
| JobConf conf = new JobConf(); | ||
| fileSys = FileSystem.get(conf); | ||
|
|
||
| conf.set("mapred.job.tracker.handler.count", "1"); | ||
| conf.set("mapred.job.tracker", "127.0.0.1:0"); | ||
| conf.set("mapred.job.tracker.http.address", "127.0.0.1:0"); | ||
| conf.set("mapred.task.tracker.http.address", "127.0.0.1:0"); | ||
|
|
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| mr = | ||
| new MiniMRCluster(taskTrackers, fileSys.getUri().toString(), 1, | ||
| null, null, conf); | ||
|
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| assertTrue(launchEmptyJob(fileSys.getUri(), 3, 1)); | ||
| assertTrue(launchEmptyJob(fileSys.getUri(), 0, 0)); | ||
| } finally { | ||
| if (fileSys != null) { | ||
| fileSys.close(); | ||
| } | ||
| if (mr != null) { | ||
| mr.shutdown(); | ||
| } | ||
| } | ||
| } | ||
| } |
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