hadoop-mapreduce/src/test/mapred/org/apache/hadoop/mapreduce/lib/input/TestMRSequenceFileAsBinaryInputFormat.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
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package org.apache.hadoop.mapreduce.lib.input;

import java.io.IOException;
import java.util.Random;

import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.MapContext;
import org.apache.hadoop.mapreduce.MapReduceTestUtil;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.task.MapContextImpl;

import junit.framework.TestCase;

public class TestMRSequenceFileAsBinaryInputFormat extends TestCase {
  private static final int RECORDS = 10000;

  public void testBinary() throws IOException, InterruptedException {
    Job job = Job.getInstance();
    FileSystem fs = FileSystem.getLocal(job.getConfiguration());
    Path dir = new Path(System.getProperty("test.build.data",".") + "/mapred");
    Path file = new Path(dir, "testbinary.seq");
    Random r = new Random();
    long seed = r.nextLong();
    r.setSeed(seed);

    fs.delete(dir, true);
    FileInputFormat.setInputPaths(job, dir);

    Text tkey = new Text();
    Text tval = new Text();

    SequenceFile.Writer writer = new SequenceFile.Writer(fs,
      job.getConfiguration(), file, Text.class, Text.class);
    try {
      for (int i = 0; i < RECORDS; ++i) {
        tkey.set(Integer.toString(r.nextInt(), 36));
        tval.set(Long.toString(r.nextLong(), 36));
        writer.append(tkey, tval);
      }
    } finally {
      writer.close();
    }
    TaskAttemptContext context = MapReduceTestUtil.
      createDummyMapTaskAttemptContext(job.getConfiguration());
    InputFormat<BytesWritable,BytesWritable> bformat =
      new SequenceFileAsBinaryInputFormat();

    int count = 0;
    r.setSeed(seed);
    BytesWritable bkey = new BytesWritable();
    BytesWritable bval = new BytesWritable();
    Text cmpkey = new Text();
    Text cmpval = new Text();
    DataInputBuffer buf = new DataInputBuffer();
    FileInputFormat.setInputPaths(job, file);
    for (InputSplit split : bformat.getSplits(job)) {
      RecordReader<BytesWritable, BytesWritable> reader =
            bformat.createRecordReader(split, context);
      MapContext<BytesWritable, BytesWritable, BytesWritable, BytesWritable> 
        mcontext = new MapContextImpl<BytesWritable, BytesWritable,
          BytesWritable, BytesWritable>(job.getConfiguration(), 
          context.getTaskAttemptID(), reader, null, null, 
          MapReduceTestUtil.createDummyReporter(), 
          split);
      reader.initialize(split, mcontext);
      try {
        while (reader.nextKeyValue()) {
          bkey = reader.getCurrentKey();
          bval = reader.getCurrentValue();
          tkey.set(Integer.toString(r.nextInt(), 36));
          tval.set(Long.toString(r.nextLong(), 36));
          buf.reset(bkey.getBytes(), bkey.getLength());
          cmpkey.readFields(buf);
          buf.reset(bval.getBytes(), bval.getLength());
          cmpval.readFields(buf);
          assertTrue(
            "Keys don't match: " + "*" + cmpkey.toString() + ":" +
            tkey.toString() + "*",
            cmpkey.toString().equals(tkey.toString()));
          assertTrue(
            "Vals don't match: " + "*" + cmpval.toString() + ":" +
            tval.toString() + "*",
            cmpval.toString().equals(tval.toString()));
          ++count;
        }
      } finally {
        reader.close();
      }
    }
    assertEquals("Some records not found", RECORDS, count);
  }

}