//HBase mapper
//Input table passed as pair to Mapper
map(ImmutableBytesWritable rowKey, Result columns, Context context)
//Write output of mapper as pair
context.write(key1,value1);

//HBase Reducer
//Reducer access of key-value pair from mapper output
reduce(Text key1, Iterable value1, Context context)
for each(IntWritable s:values1)
sum+=s
end for
// Create HBase output table with rowkey
Put outputable = new Put(key1);
// Insert sum value to HBase output table
outputable.add(columnfamily,column, sum);
// Write data to HBase ouput table
context.write(null, outputable);