Examples of org.apache.hadoop.io.WritableComparable

org.apache.hadoop.io.WritableComparable
data private int counter; private long timestamp; public void write(DataOutput out) throws IOException { out.writeInt(counter); out.writeLong(timestamp); } public void readFields(DataInput in) throws IOException { counter = in.readInt(); timestamp = in.readLong(); } public int compareTo(MyWritableComparable w) { int thisValue = this.value; int thatValue = ((IntWritable)o).value; return (thisValue < thatValue ? -1 : (thisValue==thatValue ? 0 : 1)); } }

    long logLength = TaskLog.getTaskLogLength(conf);
    cmd = TaskLog.captureOutAndError(cmd, stdout, stderr, logLength);
    process = runClient(cmd, env);
    clientSocket = serverSocket.accept();
    handler = new OutputHandler(output, reporter);
    WritableComparable outputKey = (WritableComparable)
      ReflectionUtils.newInstance(outputKeyClass, conf);
    Writable outputValue = (Writable) 
      ReflectionUtils.newInstance(outputValueClass, conf);
    downlink = new BinaryProtocol(clientSocket, handler, 
                                  outputKey, outputValue, conf);

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    downlink.runMap(reporter.getInputSplit(), 
                    job.getNumReduceTasks(), isJavaInput);
    try {
      if (isJavaInput) {
        // allocate key & value instances that are re-used for all entries
        WritableComparable key = input.createKey();
        Writable value = input.createValue();
        downlink.setInputTypes(key.getClass().getName(),
                               value.getClass().getName());
        
        while (input.next(key, value)) {
          // map pair to output
          downlink.mapItem(key, value);

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                  Reporter reporter)
    throws IOException {
    try {
      // allocate key & value instances these objects will not be reused
      // because execution of Mapper.map is not serialized.
      WritableComparable key = input.createKey();
      Writable value = input.createValue();


      while (input.next(key, value)) {


        // Run Mapper.map execution asynchronously in a separate thread.

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  public void run(RecordReader input, OutputCollector output,
                  Reporter reporter)
    throws IOException {
    try {
      // allocate key & value instances that are re-used for all entries
      WritableComparable key = input.createKey();
      Writable value = input.createValue();
      
      while (input.next(key, value)) {
        // map pair to output
        mapper.map(key, value, output, reporter);

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        try {
            objClass = Class.forName(className);
        } catch (ClassNotFoundException e) {
            throw new IOException("Could not find class " + className + ", while attempting to de-serialize it ", e);
        }
        WritableComparable writable = null;
        try {
            writable = (WritableComparable) objClass.newInstance();
        } catch (Exception e) {
            String msg = "Could create instance of class " + className
                    + ", while attempting to de-serialize it. (no default constructor ?)";
            throw new IOException(msg, e);
        }


        // read the fields of the object from DataInput
        writable.readFields(in);
        return writable;
    }

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   * using two HalfMapFiles.
   * @throws Exception
   */
  public void testBasicHalfMapFile() throws Exception {
    Path p = writeMapFile(getName());
    WritableComparable midkey = getMidkey(p);
    checkHalfMapFile(p, midkey);
  }

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      new MapFile.Reader(this.fs, p.toString(), this.conf);
    HStoreKey key = new HStoreKey();
    ImmutableBytesWritable value = new ImmutableBytesWritable();
    reader.next(key, value);
    String firstKey = key.toString();
    WritableComparable midkey = reader.midKey();
    reader.finalKey(key);
    LOG.info("First key " + firstKey + ", midkey " + midkey.toString()
        + ", last key " + key.toString());
    reader.close();
    return midkey;
  }

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        ((HStoreKey) midkey).getRow().toString());


      // Next test using a midkey that does not exist in the file.
      // First, do a key that is < than first key. Ensure splits behave
      // properly.
      WritableComparable badkey = new HStoreKey(new Text("   "));
      bottom = new HStoreFile.HalfMapFileReader(this.fs, p.toString(),
          this.conf, HStoreFile.Range.bottom, badkey);
      // When badkey is < than the bottom, should return no values.
      assertFalse(bottom.next(key, value));
      // Now read from the top.

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                  Reporter reporter)
    throws IOException {
    try {
      // allocate key & value instances these objects will not be reused
      // because execution of Mapper.map is not serialized.
      WritableComparable key = input.createKey();
      Writable value = input.createValue();


      while (input.next(key, value)) {


        // Run Mapper.map execution asynchronously in a separate thread.

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      if (top) {
        super.finalKey(key); 
      } else {
        reset();
        Writable value = new ImmutableBytesWritable();
        WritableComparable k = super.getClosest(midkey, value, true);
        ByteArrayOutputStream byteout = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(byteout);
        k.write(out);
        ByteArrayInputStream bytein =
          new ByteArrayInputStream(byteout.toByteArray());
        DataInputStream in = new DataInputStream(bytein);
        key.readFields(in);
      }

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