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CategoryCountMapper.java
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CategoryCountMapper.java
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import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
public class CategoryCountMapper extends MapReduceBase implements Mapper<Text, Text, Text, Text>{
public void map(Text key, Text value, OutputCollector<Text, Text> output, Reporter reporter) throws IOException
{
//taking one line at a time from input file and tokenizing the same
String line = value.toString();
//iterating through all the words available in that line and forming the key value pair
while (tokenizer.hasMoreTokens())
{
word.set(tokenizer.nextToken());
//sending to output collector which inturn passes the same to reducer
output.collect(word, one);
//output.collect(word, N);
}
}
}