Package org.apache.hadoop.io

Examples of org.apache.hadoop.io.NullWritable

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        SequenceFile.Reader reader = new SequenceFile.Reader(fs,
          inputVectorPath,
          conf);
        VectorWritable val = new VectorWritable();
        NullWritable nw = NullWritable.get();
        reader.next(nw, val);
        reader.close();
        inputVector = val.get();
        if (!(inputVector instanceof SequentialAccessSparseVector || inputVector instanceof DenseVector)) {
          inputVector = new SequentialAccessSparseVector(inputVector);
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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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    // loop through the 5 splits and read each
    for(int i=0; i < 4; ++i) {
      System.out.println("starting split " + i);
      rr = inf.getRecordReader(splits[i], job, Reporter.NULL);
      NullWritable key = rr.createKey();
      OrcStruct value = rr.createValue();

      // there should be exactly two rows per a split
      for(int j=0; j < 2; ++j) {
        System.out.println("i = " + i + ", j = " + j);
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    // loop through the 5 splits and read each
    for(int i=0; i < 4; ++i) {
      System.out.println("starting split " + i);
      rr = inf.getRecordReader(splits[i], job, Reporter.NULL);
      NullWritable key = rr.createKey();
      OrcStruct value = rr.createValue();

      // there should be exactly two rows per a split
      for(int j=0; j < 2; ++j) {
        System.out.println("i = " + i + ", j = " + j);
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    // read the keys before the delta is flushed
    InputSplit[] splits = inf.getSplits(job, 1);
    assertEquals(2, splits.length);
    org.apache.hadoop.mapred.RecordReader<NullWritable, OrcStruct> rr =
        inf.getRecordReader(splits[0], job, Reporter.NULL);
    NullWritable key = rr.createKey();
    OrcStruct value = rr.createValue();
    System.out.println("Looking at split " + splits[0]);
    for(int i=1; i < 6; ++i) {
      System.out.println("Checking row " + i);
      assertEquals(true, rr.next(key, value));
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    InputSplit[] splits = inputFormat.getSplits(conf, 10);
    assertEquals(1, splits.length);

    org.apache.hadoop.mapred.RecordReader<NullWritable, VectorizedRowBatch>
        reader = inputFormat.getRecordReader(splits[0], conf, Reporter.NULL);
    NullWritable key = reader.createKey();
    VectorizedRowBatch value = reader.createValue();
    assertEquals(true, reader.next(key, value));
    assertEquals(10, value.count());
    LongColumnVector col0 = (LongColumnVector) value.cols[0];
    for(int i=0; i < 10; i++) {
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    InputSplit[] splits = inputFormat.getSplits(conf, 10);
    assertEquals(1, splits.length);

    org.apache.hadoop.mapred.RecordReader<NullWritable, VectorizedRowBatch>
        reader = inputFormat.getRecordReader(splits[0], conf, Reporter.NULL);
    NullWritable key = reader.createKey();
    VectorizedRowBatch value = reader.createValue();
    assertEquals(true, reader.next(key, value));
    assertEquals(10, value.count());
    LongColumnVector col0 = (LongColumnVector) value.cols[0];
    for(int i=0; i < 10; i++) {
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    InputSplit[] splits = inputFormat.getSplits(conf, 10);
    assertEquals(1, splits.length);

    org.apache.hadoop.mapred.RecordReader<NullWritable, VectorizedRowBatch>
          reader = inputFormat.getRecordReader(splits[0], conf, Reporter.NULL);
    NullWritable key = reader.createKey();
    VectorizedRowBatch value = reader.createValue();
    assertEquals(true, reader.next(key, value));
    assertEquals(100, value.count());
    LongColumnVector booleanColumn = (LongColumnVector) value.cols[0];
    LongColumnVector byteColumn = (LongColumnVector) value.cols[1];
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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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