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MatrixMultiplication.java
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MatrixMultiplication.java
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import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.lang.reflect.Parameter;
import java.util.ArrayList;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
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.*;
import org.apache.hadoop.mapreduce.lib.output.*;
import org.apache.hadoop.util.ReflectionUtils;
public class MatrixMultiplication {
// M矩阵映射函数
public static class MatrixMapM extends Mapper<Object, Text, IntWritable, Text> {
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
// 划分i,j,value值
String readLine = value.toString();
String[] stringTokens = readLine.split(",");
Text ovalue = new Text();
IntWritable okey = new IntWritable(Integer.parseInt(stringTokens[0]));
ovalue.set("0," + stringTokens[1] + "," + stringTokens[2]);
context.write(okey, ovalue);
// <int, (M, j, double)>
}
}
// N矩阵映射
public static class MatrixMapN extends Mapper<Object, Text, IntWritable, Text> {
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
// 划分i,j,value值
String readLine = value.toString();
String[] stringTokens = readLine.split(",");
Text ovalue = new Text();
IntWritable okey = new IntWritable(Integer.parseInt(stringTokens[1]));
ovalue.set("1," + stringTokens[0] + "," + stringTokens[2]);
context.write(okey, ovalue);
// <int, (M, j, double)>
}
}
// 合并MN
public static class ReducerMN extends Reducer<IntWritable, Text, Text, DoubleWritable> {
public void reduce(IntWritable key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
// M,N矩阵
ArrayList<Text> M = new ArrayList<Text>();
ArrayList<Text> N = new ArrayList<Text>();
Configuration conf = context.getConfiguration();
for(Text v : values) {
Text tempV = ReflectionUtils.newInstance(Text.class, conf);
ReflectionUtils.copy(conf, v, tempV);
if (tempV.toString().charAt(0) == '0') {
M.add(tempV); // 添加到M集合
} else {
N.add(tempV); // 添加到N集合
}
}
for(int i = 0; i < M.size(); i++) {
for(int j = 0; j < N.size(); j++) {
Text okey = new Text();
String[] tmpm = M.get(i).toString().split(",");
String[] tmpn = N.get(j).toString().split(",");
okey.set(tmpm[1] + "\t" + tmpn[1]);
DoubleWritable ovalue = new DoubleWritable(Double.parseDouble(tmpm[2]) * Double.parseDouble(tmpn[2]));
context.write(okey, ovalue);
// <(i,j), double>
}
}
}
}
// map(i,j)需要做累加的值
public static class MapMN extends Mapper<Object, Text, Text, DoubleWritable> {
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
String readLine = value.toString();
String[] pairValue = readLine.split("\t");
Text okey = new Text();
okey.set(pairValue[0] + "," + pairValue[1]);
DoubleWritable ovalue = new DoubleWritable(Double.parseDouble(pairValue[2]));
context.write(okey, ovalue);
}
}
// reduce
public static class ReduceMN extends Reducer<Text, DoubleWritable, Text, DoubleWritable> {
public void reduce(Text key, Iterable<DoubleWritable> values, Context context)
throws IOException, InterruptedException {
double sum = 0.0;
for(DoubleWritable value : values) {
sum += value.get();
}
context.write(key, new DoubleWritable(sum));
}
}
public static void main(String []args) throws Exception{
// 乘法job
Job jobinter = Job.getInstance();
jobinter.setJobName("MapIntermediate");
jobinter.setJarByClass(MatrixMultiplication.class);
// 输入矩阵
MultipleInputs.addInputPath(jobinter, new Path(args[0]), TextInputFormat.class, MatrixMapM.class);
MultipleInputs.addInputPath(jobinter, new Path(args[1]), TextInputFormat.class, MatrixMapN.class);
// 设置mapreduce
jobinter.setReducerClass(ReducerMN.class);
jobinter.setMapOutputKeyClass(IntWritable.class);
jobinter.setMapOutputValueClass(Text.class);
jobinter.setOutputKeyClass(Text.class);
jobinter.setOutputValueClass(DoubleWritable.class);
jobinter.setOutputFormatClass(TextOutputFormat.class);
FileOutputFormat.setOutputPath(jobinter, new Path(args[2]));
jobinter.waitForCompletion(true);
// 累加job
Job job = Job.getInstance();
job.setJobName("MapFinalOutput");
job.setJarByClass(MatrixMultiplication.class);
// 设置mapreduce
job.setMapperClass(MapMN.class);
job.setReducerClass(ReduceMN.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(DoubleWritable.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(DoubleWritable.class);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
FileInputFormat.setInputPaths(job, new Path(args[2]));
FileOutputFormat.setOutputPath(job, new Path(args[3]));
job.waitForCompletion(true);
}
}