// cc SortByTemperatureToMapFile A MapReduce program for sorting a SequenceFile and producing MapFiles as output
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.SequenceFile.CompressionType;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.MapFileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

// vv SortByTemperatureToMapFile
public class SortByTemperatureToMapFile extends Configured implements Tool {
  
  @Override
  public int run(String[] args) throws Exception {
    Job job = JobBuilder.parseInputAndOutput(this, getConf(), args);
    if (job == null) {
      return -1;
    }
    
    job.setInputFormatClass(SequenceFileInputFormat.class);
    job.setOutputKeyClass(IntWritable.class);
    /*[*/job.setOutputFormatClass(MapFileOutputFormat.class);/*]*/
    SequenceFileOutputFormat.setCompressOutput(job, true);
    SequenceFileOutputFormat.setOutputCompressorClass(job, GzipCodec.class);
    SequenceFileOutputFormat.setOutputCompressionType(job,
        CompressionType.BLOCK);

    return job.waitForCompletion(true) ? 0 : 1;
  }
  
  public static void main(String[] args) throws Exception {
    int exitCode = ToolRunner.run(new SortByTemperatureToMapFile(), args);
    System.exit(exitCode);
  }
}
// ^^ SortByTemperatureToMapFile
