@Override
  public int run(String[] args) throws Exception {
    JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args);
    if (conf == null) {
      return -1;
    }

    conf.setInputFormat(SequenceFileInputFormat.class);
    conf.setOutputKeyClass(IntWritable.class);
    conf.setOutputFormat(SequenceFileOutputFormat.class);
    SequenceFileOutputFormat.setCompressOutput(conf, true);
    SequenceFileOutputFormat.setOutputCompressorClass(conf, GzipCodec.class);
    SequenceFileOutputFormat.setOutputCompressionType(conf, CompressionType.BLOCK);

    conf.setPartitionerClass(TotalOrderPartitioner.class);

    InputSampler.Sampler<IntWritable, Text> sampler =
        new InputSampler.RandomSampler<IntWritable, Text>(0.1, 10000, 10);

    Path input = FileInputFormat.getInputPaths(conf)[0];
    input = input.makeQualified(input.getFileSystem(conf));

    Path partitionFile = new Path(input, "_partitions");
    TotalOrderPartitioner.setPartitionFile(conf, partitionFile);
    InputSampler.writePartitionFile(conf, sampler);

    // Add to DistributedCache
    URI partitionUri = new URI(partitionFile.toString() + "#_partitions");
    DistributedCache.addCacheFile(partitionUri, conf);
    DistributedCache.createSymlink(conf);

    JobClient.runJob(conf);
    return 0;
  }
コード例 #2
0
  @Override
  public int run(String[] args) throws IOException {
    JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args);
    if (conf == null) {
      return -1;
    }

    conf.setMapperClass(MaxTemperatureMapper.class);
    /*[*/ conf.setPartitionerClass(FirstPartitioner.class); /*]*/
    /*[*/ conf.setOutputKeyComparatorClass(KeyComparator.class); /*]*/
    /*[*/ conf.setOutputValueGroupingComparator(GroupComparator.class); /*]*/
    conf.setReducerClass(MaxTemperatureReducer.class);
    conf.setOutputKeyClass(IntPair.class);
    conf.setOutputValueClass(NullWritable.class);

    JobClient.runJob(conf);
    return 0;
  }
  @Override
  public int run(String[] args) throws IOException {
    JobConf conf = JobBuilder.parseInputAndOutput(this, getConf(), args);
    if (conf == null) {
      return -1;
    }

    conf.setMapperClass(StationMapper.class);
    conf.setMapOutputKeyClass(Text.class);
    conf.setReducerClass(MultipleOutputsReducer.class);
    conf.setOutputKeyClass(NullWritable.class);
    conf.setOutputFormat(NullOutputFormat.class); // suppress empty part file

    MultipleOutputs.addMultiNamedOutput(
        conf, "station", TextOutputFormat.class, NullWritable.class, Text.class);

    JobClient.runJob(conf);
    return 0;
  }