Examples of org.apache.hadoop.io.NullWritable

org.apache.hadoop.io.NullWritable
Singleton Writable with no data.


        final Path file = new Path(new File("target/test/test-camel-bytes").getAbsolutePath());
        Configuration conf = new Configuration();
        FileSystem fs1 = FileSystem.get(file.toUri(), conf);
        SequenceFile.Writer writer = createWriter(fs1, conf, file, NullWritable.class, BytesWritable.class);
        NullWritable keyWritable = NullWritable.get();
        BytesWritable valueWritable = new BytesWritable();
        String value = "CIAO!";
        valueWritable.set(value.getBytes(), 0, value.getBytes().length);
        writer.append(keyWritable, valueWritable);
        writer.sync();

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        final Path file = new Path(new File("target/test/test-camel-string").getAbsolutePath());
        Configuration conf = new Configuration();
        FileSystem fs1 = FileSystem.get(file.toUri(), conf);
        SequenceFile.Writer writer = createWriter(fs1, conf, file, NullWritable.class, Text.class);
        NullWritable keyWritable = NullWritable.get();
        Text valueWritable = new Text();
        String value = "CIAO!";
        valueWritable.set(value);
        writer.append(keyWritable, valueWritable);
        writer.sync();

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  TextOutputFormat<?, ?> theOutputFormat = new TextOutputFormat();
  RecordWriter theRecordWriter = theOutputFormat
      .getRecordWriter(tContext);
  
  NullWritable nullWritable = NullWritable.get();
  try {
    theRecordWriter.write(key2, val2);
    theRecordWriter.write(null, nullWritable);
    theRecordWriter.write(null, val2);
    theRecordWriter.write(nullWritable, val1);

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    TextOutputFormat<?, ?> theOutputFormat = new TextOutputFormat();
    RecordWriter theRecordWriter = theOutputFormat
        .getRecordWriter(tContext);
    
    NullWritable nullWritable = NullWritable.get();
    try {
      theRecordWriter.write(key1, val1);
      theRecordWriter.write(null, nullWritable);
      theRecordWriter.write(null, val1);
      theRecordWriter.write(nullWritable, val2);

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    final SequenceFile.Reader reader = new Reader(FileSystem.getLocal(
      baseTmpDir.getDefaultConfiguration()),
        new Path(getOutputFile(outputDir, "*.seq").toString()),
        baseTmpDir.getDefaultConfiguration());
    final List<String> actual = Lists.newArrayList();
    final NullWritable key = NullWritable.get();
    final Text value = new Text();
    while (reader.next(key, value)) {
      actual.add(value.toString());
    }
    reader.close();

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public class WritablesTest {


  @Test
  public void testNulls() throws Exception {
    Void n = null;
    NullWritable nw = NullWritable.get();
    testInputOutputFn(Writables.nulls(), n, nw);
  }

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    final ArrayList<DoubleVector> centers = new ArrayList<DoubleVector>();
    SequenceFile.Reader reader = null;
    try {
      reader = new SequenceFile.Reader(fs, centroids, peer.getConfiguration());
      VectorWritable key = new VectorWritable();
      NullWritable value = NullWritable.get();
      while (reader.next(key, value)) {
        DoubleVector center = key.getVector();
        centers.add(center);
      }
    } catch (IOException e) {

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    final DoubleVector[] newCenterArray = new DoubleVector[centers.length];
    final int[] summationCount = new int[centers.length];
    // if our cache is not enabled, iterate over the disk items
    if (cache == null) {
      // we have an assignment step
      final NullWritable value = NullWritable.get();
      final VectorWritable key = new VectorWritable();
      while (peer.readNext(key, value)) {
        assignCentersInternal(newCenterArray, summationCount, key.getVector()
            .deepCopy());
      }
    } else {
      // if our cache is enabled but empty, we have to read it from disk first
      if (cache.isEmpty()) {
        final NullWritable value = NullWritable.get();
        final VectorWritable key = new VectorWritable();
        while (peer.readNext(key, value)) {
          DoubleVector deepCopy = key.getVector().deepCopy();
          cache.add(deepCopy);
          // but do the assignment directly

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  }


  private void recalculateAssignmentsAndWrite(
      BSPPeer<VectorWritable, NullWritable, IntWritable, VectorWritable, CenterMessage> peer)
      throws IOException {
    final NullWritable value = NullWritable.get();
    // also use our cache to speed up the final writes if exists
    if (cache == null) {
      final VectorWritable key = new VectorWritable();
      IntWritable keyWrite = new IntWritable();
      while (peer.readNext(key, value)) {

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      fs.delete(center, true);


    if (fs.exists(in))
      fs.delete(in, true);


    final NullWritable value = NullWritable.get();


    Writer centerWriter = new SequenceFile.Writer(fs, conf, center,
        VectorWritable.class, NullWritable.class);


    final SequenceFile.Writer dataWriter = SequenceFile.createWriter(fs, conf,

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