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StudentPass.java
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StudentPass.java
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import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
public class StudentPass {
public static class TokenizerMapper
extends Mapper<Object, Text, Text, IntWritable> {
// input will be as:
// <STUDENT_ID> <COURSE_ID> <GRADE>
private final static IntWritable one = new IntWritable(1);
private Text studentId = new Text();
private Text courseId = new Text();
private Text grade = new Text();
public void map(Object key, Text value, Context context
) throws IOException, InterruptedException {
StringTokenizer itr = new StringTokenizer(value.toString());
while (itr.hasMoreTokens()) {
studentId.set(itr.nextToken());
courseId.set(itr.nextToken());
grade.set(itr.nextToken());
if (Integer.parseInt(grade.toString()) >= 60) {
context.write(studentId, one);
}
}
}
}
public static class IntSumReducer
extends Reducer<Text,IntWritable,Text,IntWritable> {
private IntWritable result = new IntWritable();
public void reduce(Text key, Iterable<IntWritable> values,
Context context
) throws IOException, InterruptedException {
int sum = 0;
for (IntWritable val : values) {
sum += val.get();
}
result.set(sum);
context.write(key, result);
}
}
}