public void testStep0Mapper() throws Exception {
    Random rng = RandomUtils.getRandom();

    // create a dataset large enough to be split up
    String descriptor = Utils.randomDescriptor(rng, numAttributes);
    double[][] source = Utils.randomDoubles(rng, descriptor, numInstances);
    String[] sData = Utils.double2String(source);

    // write the data to a file
    Path dataPath = Utils.writeDataToTestFile(sData);

    JobConf job = new JobConf();
    job.setNumMapTasks(numMaps);

    FileInputFormat.setInputPaths(job, dataPath);

    // retrieve the splits
    TextInputFormat input = (TextInputFormat) job.getInputFormat();
    InputSplit[] splits = input.getSplits(job, numMaps);

    InputSplit[] sorted = Arrays.copyOf(splits, splits.length);
    Builder.sortSplits(sorted);

    Step0OutputCollector collector = new Step0OutputCollector(numMaps);
    Reporter reporter = Reporter.NULL;

    for (int p = 0; p < numMaps; p++) {
      InputSplit split = sorted[p];
      RecordReader<LongWritable, Text> reader = input.getRecordReader(split, job, reporter);

      LongWritable key = reader.createKey();
      Text value = reader.createValue();

      Step0Mapper mapper = new Step0Mapper();
      mapper.configure(p);

      Long firstKey = null;
      int size = 0;

      while (reader.next(key, value)) {
        if (firstKey == null) {
          firstKey = key.get();
        }

        mapper.map(key, value, collector, reporter);

        size++;
      }

      mapper.close();

      // validate the mapper's output
      assertEquals(p, collector.keys[p]);
      assertEquals(firstKey.longValue(), collector.values[p].getFirstId());
      assertEquals(size, collector.values[p].getSize());
    }
  }
예제 #2
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 @Override
 public void reset() {
   // TODO Auto-generated method stub
   try {
     this.reader = input_format.getRecordReader(this.split, this.jobConf, voidReporter);
   } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
   }
 }
예제 #3
0
  @Override
  public void setFile(String file, long offset, long length) {
    JobConf defaultConf = new JobConf();
    this.split = new FileSplit(new Path(file), offset, length, defaultConf);

    this.jobConf = defaultConf;
    // this.split = split;
    this.input_format = new TextInputFormat();

    try {
      this.reader = input_format.getRecordReader(this.split, this.jobConf, voidReporter);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    this.key = reader.createKey();
  }
  public void testProcessOutput() throws Exception {
    Random rng = RandomUtils.getRandom();

    // create a dataset large enough to be split up
    String descriptor = Utils.randomDescriptor(rng, numAttributes);
    double[][] source = Utils.randomDoubles(rng, descriptor, numInstances);

    // each instance label is its index in the dataset
    int labelId = Utils.findLabel(descriptor);
    for (int index = 0; index < numInstances; index++) {
      source[index][labelId] = index;
    }

    String[] sData = Utils.double2String(source);

    // write the data to a file
    Path dataPath = Utils.writeDataToTestFile(sData);

    // prepare a data converter
    Dataset dataset = DataLoader.generateDataset(descriptor, sData);
    DataConverter converter = new DataConverter(dataset);

    JobConf job = new JobConf();
    job.setNumMapTasks(numMaps);
    FileInputFormat.setInputPaths(job, dataPath);

    // retrieve the splits
    TextInputFormat input = (TextInputFormat) job.getInputFormat();
    InputSplit[] splits = input.getSplits(job, numMaps);

    InputSplit[] sorted = Arrays.copyOf(splits, splits.length);
    Builder.sortSplits(sorted);

    Reporter reporter = Reporter.NULL;

    int[] keys = new int[numMaps];
    Step0Output[] values = new Step0Output[numMaps];

    int[] expectedIds = new int[numMaps];

    for (int p = 0; p < numMaps; p++) {
      InputSplit split = sorted[p];
      RecordReader<LongWritable, Text> reader = input.getRecordReader(split, job, reporter);

      LongWritable key = reader.createKey();
      Text value = reader.createValue();

      Long firstKey = null;
      int size = 0;

      while (reader.next(key, value)) {
        if (firstKey == null) {
          firstKey = key.get();
          expectedIds[p] = converter.convert(0, value.toString()).label;
        }

        size++;
      }

      keys[p] = p;
      values[p] = new Step0Output(firstKey, size);
    }

    Step0Output[] partitions = Step0Job.processOutput(keys, values);

    int[] actualIds = Step0Output.extractFirstIds(partitions);

    assertTrue(
        "Expected: " + Arrays.toString(expectedIds) + " But was: " + Arrays.toString(actualIds),
        Arrays.equals(expectedIds, actualIds));
  }