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

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Here is the source code for org.apache.hadoop.mapred.TestLocalModeWithNewApis.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 static org.junit.Assert.*;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Random;
import java.util.StringTokenizer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.MRConfig;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestLocalModeWithNewApis {

    public static final Log LOG = LogFactory.getLog(TestLocalModeWithNewApis.class);

    Configuration conf;

    @Before
    public void setUp() throws Exception {
        conf = new Configuration();
        conf.set(MRConfig.FRAMEWORK_NAME, MRConfig.LOCAL_FRAMEWORK_NAME);
    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void testNewApis() throws Exception {
        Random r = new Random(System.currentTimeMillis());
        Path tmpBaseDir = new Path("/tmp/wc-" + r.nextInt());
        final Path inDir = new Path(tmpBaseDir, "input");
        final Path outDir = new Path(tmpBaseDir, "output");
        String input = "The quick brown fox\nhas many silly\nred fox sox\n";
        FileSystem inFs = inDir.getFileSystem(conf);
        FileSystem outFs = outDir.getFileSystem(conf);
        outFs.delete(outDir, true);
        if (!inFs.mkdirs(inDir)) {
            throw new IOException("Mkdirs failed to create " + inDir.toString());
        }
        {
            DataOutputStream file = inFs.create(new Path(inDir, "part-0"));
            file.writeBytes(input);
            file.close();
        }

        Job job = Job.getInstance(conf, "word count");
        job.setJarByClass(TestLocalModeWithNewApis.class);
        job.setMapperClass(TokenizerMapper.class);
        job.setCombinerClass(IntSumReducer.class);
        job.setReducerClass(IntSumReducer.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);
        FileInputFormat.addInputPath(job, inDir);
        FileOutputFormat.setOutputPath(job, outDir);
        assertEquals(job.waitForCompletion(true), true);

        String output = readOutput(outDir, conf);
        assertEquals("The\t1\nbrown\t1\nfox\t2\nhas\t1\nmany\t1\n" + "quick\t1\nred\t1\nsilly\t1\nsox\t1\n",
                output);

        outFs.delete(tmpBaseDir, true);
    }

    static String readOutput(Path outDir, Configuration conf) throws IOException {
        FileSystem fs = outDir.getFileSystem(conf);
        StringBuffer result = new StringBuffer();

        Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir, new Utils.OutputFileUtils.OutputFilesFilter()));
        for (Path outputFile : fileList) {
            LOG.info("Path" + ": " + outputFile);
            BufferedReader file = new BufferedReader(new InputStreamReader(fs.open(outputFile)));
            String line = file.readLine();
            while (line != null) {
                result.append(line);
                result.append("\n");
                line = file.readLine();
            }
            file.close();
        }
        return result.toString();
    }

    public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> {

        private final static IntWritable one = new IntWritable(1);
        private Text word = new Text();

        public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
            StringTokenizer itr = new StringTokenizer(value.toString());
            while (itr.hasMoreTokens()) {
                word.set(itr.nextToken());
                context.write(word, one);
            }
        }
    }

    public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
        private IntWritable result = new IntWritable();

        public void reduce(Text key, Iterable<IntWritable> values, Context context)
                throws IOException, InterruptedException {
            int sum = 0;
            for (IntWritable val : values) {
                sum += val.get();
            }
            result.set(sum);
            context.write(key, result);
        }
    }

}