org.apache.hadoop.mapred.TestSpecialCharactersInOutputPath.java Source code

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Here is the source code for org.apache.hadoop.mapred.TestSpecialCharactersInOutputPath.java

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/**
 * 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.DataOutputStream;
import java.io.IOException;

import junit.framework.TestCase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.lib.IdentityMapper;
import org.apache.hadoop.mapred.lib.IdentityReducer;
import org.apache.hadoop.util.Progressable;

/**
 * A JUnit test to test that jobs' output filenames are not HTML-encoded (cf HADOOP-1795).
 */
public class TestSpecialCharactersInOutputPath extends TestCase {
    private static final Log LOG = LogFactory.getLog(TestSpecialCharactersInOutputPath.class.getName());

    private static final String OUTPUT_FILENAME = "result[0]";

    public static boolean launchJob(String fileSys, String jobTracker, JobConf conf, int numMaps, int numReduces)
            throws IOException {

        final Path inDir = new Path("/testing/input");
        final Path outDir = new Path("/testing/output");
        FileSystem fs = FileSystem.getNamed(fileSys, conf);
        fs.delete(outDir, true);
        if (!fs.mkdirs(inDir)) {
            LOG.warn("Can't create " + inDir);
            return false;
        }
        // generate an input file
        DataOutputStream file = fs.create(new Path(inDir, "part-0"));
        file.writeBytes("foo foo2 foo3");
        file.close();

        // use WordCount example
        FileSystem.setDefaultUri(conf, fileSys);
        conf.set("mapred.job.tracker", jobTracker);
        conf.setJobName("foo");

        conf.setInputFormat(TextInputFormat.class);
        conf.setOutputFormat(SpecialTextOutputFormat.class);
        conf.setOutputKeyClass(LongWritable.class);
        conf.setOutputValueClass(Text.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
        RunningJob runningJob = JobClient.runJob(conf);

        try {
            assertTrue(runningJob.isComplete());
            assertTrue(runningJob.isSuccessful());
            assertTrue("Output folder not found!", fs.exists(new Path("/testing/output/" + OUTPUT_FILENAME)));
        } catch (NullPointerException npe) {
            // This NPE should no more happens
            fail("A NPE should not have happened.");
        }

        // return job result
        LOG.info("job is complete: " + runningJob.isSuccessful());
        return (runningJob.isSuccessful());
    }

    public void testJobWithDFS() throws IOException {
        String namenode = null;
        MiniDFSCluster dfs = null;
        MiniMRCluster mr = null;
        FileSystem fileSys = null;
        try {
            final int taskTrackers = 4;
            final int jobTrackerPort = 60050;
            Configuration conf = new Configuration();
            dfs = new MiniDFSCluster(conf, 1, true, null);
            fileSys = dfs.getFileSystem();
            namenode = fileSys.getName();
            mr = new MiniMRCluster(taskTrackers, namenode, 2);
            final String jobTrackerName = "localhost:" + mr.getJobTrackerPort();
            JobConf jobConf = new JobConf();
            boolean result;
            result = launchJob(namenode, jobTrackerName, jobConf, 3, 1);
            assertTrue(result);

        } finally {
            if (dfs != null) {
                dfs.shutdown();
            }
            if (mr != null) {
                mr.shutdown();
            }
        }
    }

    /** generates output filenames with special characters */
    static class SpecialTextOutputFormat<K, V> extends TextOutputFormat<K, V> {
        @Override
        public RecordWriter<K, V> getRecordWriter(FileSystem ignored, JobConf job, String name,
                Progressable progress) throws IOException {
            return super.getRecordWriter(ignored, job, OUTPUT_FILENAME, progress);
        }
    }
}