public int run(String[] args) throws Exception {
    if (args.length == 0) {
      System.err.println("Too few arguments!");
      printUsage();
      return 1;
    }
    Path path = new Path(args[0]);
    FileSystem fs = path.getFileSystem(getConf());
    if (fs.exists(path)) {
      System.err.println("given path exists already!");
      return -1;
    }
    TypedBytesInput tbinput = new TypedBytesInput(new DataInputStream(System.in));
    SequenceFile.Writer writer = SequenceFile.createWriter(fs, conf, path,
      TypedBytesWritable.class, TypedBytesWritable.class);
    try {
      TypedBytesWritable key = new TypedBytesWritable();
      TypedBytesWritable value = new TypedBytesWritable();
      byte[] rawKey = tbinput.readRaw();
      while (rawKey != null) {
        byte[] rawValue = tbinput.readRaw();
        key.set(rawKey, 0, rawKey.length);
        value.set(rawValue, 0, rawValue.length);
        writer.append(key, value);
        rawKey = tbinput.readRaw();
      }
    } finally {
      writer.close();
    }
    return 0;
  }
@Test
  public void testLoading() throws Exception {
    Configuration conf = new Configuration();
    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2)
        .build();
    FileSystem fs = cluster.getFileSystem();
    
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    TypedBytesOutput tboutput = new TypedBytesOutput(new DataOutputStream(out));
    for (int i = 0; i < 100; i++) {
      tboutput.write(new Long(i)); // key
      tboutput.write("" + (10 * i)); // value
    }
    InputStream isBackup = System.in;
    ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
    System.setIn(in);
    LoadTypedBytes loadtb = new LoadTypedBytes(conf);

    try {
      Path root = new Path("/typedbytestest");
      assertTrue(fs.mkdirs(root));
      assertTrue(fs.exists(root));
      
      String[] args = new String[1];
      args[0] = "/typedbytestest/test.seq";
      int ret = loadtb.run(args);
      assertEquals("Return value != 0.", 0, ret);

      Path file = new Path(root, "test.seq");
      assertTrue(fs.exists(file));
      SequenceFile.Reader reader = new SequenceFile.Reader(fs, file, conf);
      int counter = 0;
      TypedBytesWritable key = new TypedBytesWritable();
      TypedBytesWritable value = new TypedBytesWritable();
      while (reader.next(key, value)) {
        assertEquals(Long.class, key.getValue().getClass());
        assertEquals(String.class, value.getValue().getClass());
        assertTrue("Invalid record.",
          Integer.parseInt(value.toString()) % 10 == 0);
        counter++;
      }
      assertEquals("Wrong number of records.", 100, counter);
    } finally {
      try {
        fs.close();
      } catch (Exception e) {
      }
      System.setIn(isBackup);
      cluster.shutdown();
    }
  }