hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestTextOutputFormat.java

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

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.compress.DefaultCodec;
import org.apache.hadoop.io.compress.CompressionInputStream;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.LineReader;

public class TestTextOutputFormat {
  private static JobConf defaultConf = new JobConf();

  private static FileSystem localFs = null;
  static {
    try {
      localFs = FileSystem.getLocal(defaultConf);
    } catch (IOException e) {
      throw new RuntimeException("init failure", e);
    }
  }
  // A random task attempt id for testing.
  private static String attempt = "attempt_200707121733_0001_m_000000_0";

  private static Path workDir =
    new Path(new Path(
                      new Path(System.getProperty("test.build.data", "."),
                               "data"),
                      FileOutputCommitter.TEMP_DIR_NAME), "_" + attempt);

  @Test
  public void testFormat() throws Exception {
    JobConf job = new JobConf();
    job.set(JobContext.TASK_ATTEMPT_ID, attempt);
    FileOutputFormat.setOutputPath(job, workDir.getParent().getParent());
    FileOutputFormat.setWorkOutputPath(job, workDir);
    FileSystem fs = workDir.getFileSystem(job);
    if (!fs.mkdirs(workDir)) {
      fail("Failed to create output directory");
    }
    String file = "test_format.txt";

    // A reporter that does nothing
    Reporter reporter = Reporter.NULL;

    TextOutputFormat<Object,Object> theOutputFormat = new TextOutputFormat<Object,Object>();
    RecordWriter<Object,Object> theRecordWriter =
      theOutputFormat.getRecordWriter(localFs, job, file, reporter);

    Text key1 = new Text("key1");
    Text key2 = new Text("key2");
    Text val1 = new Text("val1");
    Text val2 = new Text("val2");
    NullWritable nullWritable = NullWritable.get();

    try {
      theRecordWriter.write(key1, val1);
      theRecordWriter.write(null, nullWritable);
      theRecordWriter.write(null, val1);
      theRecordWriter.write(nullWritable, val2);
      theRecordWriter.write(key2, nullWritable);
      theRecordWriter.write(key1, null);
      theRecordWriter.write(null, null);
      theRecordWriter.write(key2, val2);

    } finally {
      theRecordWriter.close(reporter);
    }
    File expectedFile = new File(new Path(workDir, file).toString());
    StringBuffer expectedOutput = new StringBuffer();
    expectedOutput.append(key1).append('\t').append(val1).append("\n");
    expectedOutput.append(val1).append("\n");
    expectedOutput.append(val2).append("\n");
    expectedOutput.append(key2).append("\n");
    expectedOutput.append(key1).append("\n");
    expectedOutput.append(key2).append('\t').append(val2).append("\n");
    String output = UtilsForTests.slurp(expectedFile);
    assertEquals(expectedOutput.toString(), output);

  }

  @Test
  public void testFormatWithCustomSeparator() throws Exception {
    JobConf job = new JobConf();
    String separator = "\u0001";
    job.set("mapreduce.output.textoutputformat.separator", separator);
    job.set(JobContext.TASK_ATTEMPT_ID, attempt);
    FileOutputFormat.setOutputPath(job, workDir.getParent().getParent());
    FileOutputFormat.setWorkOutputPath(job, workDir);
    FileSystem fs = workDir.getFileSystem(job);
    if (!fs.mkdirs(workDir)) {
      fail("Failed to create output directory");
    }
    String file = "test_custom.txt";

    // A reporter that does nothing
    Reporter reporter = Reporter.NULL;

    TextOutputFormat<Object,Object> theOutputFormat = new TextOutputFormat<Object,Object>();
    RecordWriter<Object,Object> theRecordWriter =
      theOutputFormat.getRecordWriter(localFs, job, file, reporter);

    Text key1 = new Text("key1");
    Text key2 = new Text("key2");
    Text val1 = new Text("val1");
    Text val2 = new Text("val2");
    NullWritable nullWritable = NullWritable.get();

    try {
      theRecordWriter.write(key1, val1);
      theRecordWriter.write(null, nullWritable);
      theRecordWriter.write(null, val1);
      theRecordWriter.write(nullWritable, val2);
      theRecordWriter.write(key2, nullWritable);
      theRecordWriter.write(key1, null);
      theRecordWriter.write(null, null);
      theRecordWriter.write(key2, val2);

    } finally {
      theRecordWriter.close(reporter);
    }
    File expectedFile = new File(new Path(workDir, file).toString());
    StringBuffer expectedOutput = new StringBuffer();
    expectedOutput.append(key1).append(separator).append(val1).append("\n");
    expectedOutput.append(val1).append("\n");
    expectedOutput.append(val2).append("\n");
    expectedOutput.append(key2).append("\n");
    expectedOutput.append(key1).append("\n");
    expectedOutput.append(key2).append(separator).append(val2).append("\n");
    String output = UtilsForTests.slurp(expectedFile);
    assertEquals(expectedOutput.toString(), output);

  }

  /**
   * test compressed file
   * @throws IOException
   */
  @Test
  public void testCompress() throws IOException {
   JobConf job = new JobConf();
   job.set(JobContext.TASK_ATTEMPT_ID, attempt);
   job.set(org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.COMPRESS,"true");

   FileOutputFormat.setOutputPath(job, workDir.getParent().getParent());
   FileOutputFormat.setWorkOutputPath(job, workDir);
   FileSystem fs = workDir.getFileSystem(job);
   if (!fs.mkdirs(workDir)) {
     fail("Failed to create output directory");
   }
   String file = "test_compress.txt";

   // A reporter that does nothing
   Reporter reporter = Reporter.NULL;

   TextOutputFormat<Object,Object> theOutputFormat = new TextOutputFormat<Object,Object>();
   RecordWriter<Object,Object> theRecordWriter =
     theOutputFormat.getRecordWriter(localFs, job, file, reporter);
   Text key1 = new Text("key1");
   Text key2 = new Text("key2");
   Text val1 = new Text("val1");
   Text val2 = new Text("val2");
   NullWritable nullWritable = NullWritable.get();

   try {
     theRecordWriter.write(key1, val1);
     theRecordWriter.write(null, nullWritable);
     theRecordWriter.write(null, val1);
     theRecordWriter.write(nullWritable, val2);
     theRecordWriter.write(key2, nullWritable);
     theRecordWriter.write(key1, null);
     theRecordWriter.write(null, null);
     theRecordWriter.write(key2, val2);

   } finally {
     theRecordWriter.close(reporter);
   }
   StringBuffer expectedOutput = new StringBuffer();
   expectedOutput.append(key1).append("\t").append(val1).append("\n");
   expectedOutput.append(val1).append("\n");
   expectedOutput.append(val2).append("\n");
   expectedOutput.append(key2).append("\n");
   expectedOutput.append(key1).append("\n");
   expectedOutput.append(key2).append("\t").append(val2).append("\n");

   DefaultCodec codec = new DefaultCodec();
   codec.setConf(job);
   Path expectedFile = new Path(workDir, file + codec.getDefaultExtension());
   final FileInputStream istream = new FileInputStream(expectedFile.toString());
   CompressionInputStream cistream = codec.createInputStream(istream);
   LineReader reader = new LineReader(cistream);

   String output = "";
   Text out = new Text();
   while (reader.readLine(out) > 0) {
     output += out;
     output += "\n";
   }
   reader.close();

   assertEquals(expectedOutput.toString(), output);
 }
  public static void main(String[] args) throws Exception {
    new TestTextOutputFormat().testFormat();
  }
}