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import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
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;
import org.apache.hadoop.util.GenericOptionsParser;
public class MartrixMultiplication{
public static class MartrixMapper extends Mapper<Object, Text, Text, Text>{
private Text map_key = new Text();
private Text map_value = new Text();
int rNumber = 50;
int cNumber = 50;
String fileTarget;
String i, j, k, ij, jk;
public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
String eachterm[] = value.toString().split("#");
fileTarget = eachterm[0];
if(fileTarget.equals("M")){
i = eachterm[1];
j = eachterm[2];
ij = eachterm[3];
for(int c = 1; c<=cNumber; c++){
map_key.set(i + "#" + String.valueOf(c));
map_value.set("M" + "#" + j + "#" + ij);
context.write(map_key, map_value);
}
}else if(fileTarget.equals("N")){
j = eachterm[1];
k = eachterm[2];
jk = eachterm[3];
for(int r = 1; r<=rNumber; r++){
map_key.set(String.valueOf(r) + "#" +k);
map_value.set("N" + "#" + j + "#" + jk);
context.write(map_key, map_value);
}
}
}
}
public static class MartrixReducer extends Reducer<Text,Text,Text,Text> {
private Text reduce_value = new Text();
int jNumber = 50;
int M_ij[] = new int[jNumber+1];
int N_jk[] = new int[jNumber+1];
int j, ij, jk;
String fileTarget;
int jsum = 0;
public void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {
jsum = 0;
for (Text val : values) {
String eachterm[] = val.toString().split("#");
fileTarget = eachterm[0];
j = Integer.parseInt(eachterm[1]);
if(fileTarget.equals("M")){
ij = Integer.parseInt(eachterm[2]);
M_ij[j] = ij;
}else if(fileTarget.equals("N")){
jk = Integer.parseInt(eachterm[2]);
N_jk[j] = jk;
}
}
for(int d = 1; d<=jNumber; d++){
jsum += M_ij[d] * N_jk[d];
}
reduce_value.set(String.valueOf(jsum));
context.write(key, reduce_value);
}
}
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
if (otherArgs.length != 2) {
System.err.println("Usage: MartrixMultiplication <in> <out>");
System.exit(2);
}
Job job = new Job(conf, "martrixmultiplication");
job.setJarByClass(MartrixMultiplication.class);
job.setMapperClass(MartrixMapper.class);
job.setReducerClass(MartrixReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}

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