content: package com.manning.hip.ch2;
  
  import com.manning.hip.ch3.avro.gen.Stock;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.KeyValue;
  import org.apache.hadoop.hbase.client.*;
  import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
  import org.apache.hadoop.hbase.mapreduce.*;
  import org.apache.hadoop.io.*;
  import org.apache.hadoop.mapreduce.*;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  
  import java.io.IOException;
  
  import static com.manning.hip.ch2.HBaseWriteAvroStock.*;
  
  public class HBaseSourceMapReduce extends
      TableMapper<Text, DoubleWritable> {
  
    private HBaseScanAvroStock.AvroStockReader stockReader;
    private Text outputKey = new Text();
    private DoubleWritable outputValue = new DoubleWritable();
  
    @Override
    protected void setup(
        Context context)
        throws IOException, InterruptedException {
      stockReader = new HBaseScanAvroStock.AvroStockReader();
    }
  
    @Override
    public void map(ImmutableBytesWritable row, Result columns,
                    Context context)
        throws IOException, InterruptedException {
        for (KeyValue kv : columns.list()) {
          byte[] value = kv.getValue();
  
          Stock stock = stockReader.decode(value);
  
          outputKey.set(stock.symbol.toString());
          outputValue.set(stock.close);
          context.write(outputKey, outputValue);
        }
    }
  
    public static void main(String[] args) throws Exception {
      Configuration conf = new Configuration();
  
      Scan scan = new Scan();
      scan.addColumn(STOCK_DETAILS_COLUMN_FAMILY_AS_BYTES,
          STOCK_COLUMN_QUALIFIER_AS_BYTES);
      Job job = new Job(conf);
  
      job.setJarByClass(HBaseSourceMapReduce.class);
  
      TableMapReduceUtil.initTableMapperJob(
          STOCKS_TABLE_NAME,
          scan,
          HBaseSourceMapReduce.class,
          ImmutableBytesWritable.class,
          Put.class,
          job);
  
      job.setNumReduceTasks(0);
  
      job.setMapOutputKeyClass(Text.class);
      job.setMapOutputValueClass(DoubleWritable.class);
  
      Path outputPath = new Path(args[0]);
  
      FileOutputFormat.setOutputPath(job, outputPath);
  
      outputPath.getFileSystem(conf).delete(outputPath, true);
  
      job.waitForCompletion(true);
    }
  }