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ProcessUnit.java
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ProcessUnit.java
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package hadoopApp;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.*;
import java.io.IOException;
import java.io.IOException;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.*;
public class ProcessUnit {
//Mapper class
public static class E_EMapper extends MapReduceBase implements
Mapper<LongWritable,/*Input key Type */
Text, /*Input value Type*/
Text, /*Output key Type*/
IntWritable> /*Output value Type*/ {
//Map function
public void map(LongWritable key, Text value,
OutputCollector<Text, IntWritable> output,
Reporter reporter) throws IOException {
String line = value.toString();
String[] words = line.split(",");
for (String word : words) {
Text outputKey = new Text(word.toUpperCase().trim());
IntWritable outputValue = new IntWritable(1);
output.collect(outputKey, outputValue);
}
}
}
//Reducer class
public static class E_EReduce extends MapReduceBase implements
Reducer<Text, IntWritable, Text, IntWritable> {
//Reduce function
public void reduce(Text key, Iterator<IntWritable> values,
OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
int sum = 0;
for (Iterator<IntWritable> it = values; it.hasNext(); ) {
IntWritable value = it.next();
sum += value.get();
}
output.collect(key, new IntWritable(sum));
}
}
//Main function
public static void main(String args[]) throws Exception {
Scanner reader = new Scanner(System.in); // Reading from System.in
System.out.println("Enter a number: ");
int n = reader.nextInt(); // Scans the next token of the input as an int.
//once finished
System.out.println("you've enetered: " + n);
reader.close();
FileSystem hdfs = FileSystem.get(new Configuration());
Path homeDir = hdfs.getHomeDirectory();
//Print the home directory
// System.out.println("Home folder -" + homeDir);
Path path = new Path(args[1]);
JobConf conf = new JobConf(ProcessUnit.class);
FileSystem fs = FileSystem.get(conf);
fs.delete(path);
conf.setJobName("max_eletricityunits");
conf.setOutputKeyClass(Text.class);
conf.setOutputValueClass(IntWritable.class);
conf.setMapperClass(E_EMapper.class);
conf.setCombinerClass(E_EReduce.class);
conf.setReducerClass(E_EReduce.class);
conf.setInputFormat(TextInputFormat.class);
conf.setOutputFormat(TextOutputFormat.class);
FileInputFormat.setInputPaths(conf, new Path(args[0]));
FileOutputFormat.setOutputPath(conf, new Path(args[1]));
JobClient.runJob(conf);
Path workingDir=hdfs.getWorkingDirectory();
Path newFolderPath= new Path(workingDir,"MyDataFolder");
//newFolderPath=Path.mergePaths(workingDir, newFolderPath);
Path newFilePath=new Path(newFolderPath+"/newFile.txt");
if(hdfs.exists(newFilePath)){
System.out.println("already existing");
hdfs.delete(newFilePath,true);
}else{
System.out.println("dont know");
}
if(hdfs.exists(newFilePath)){
System.out.println("already existing");
hdfs.delete(newFilePath,true);
}else{
System.out.println("dont know");
}
if(hdfs.exists(newFolderPath))
{
hdfs.delete(newFolderPath, true); //Delete existing Directory
}
hdfs.mkdirs(newFolderPath); //Create new Directory
System.out.println("Home folder -" + homeDir);
System.out.println("working dir -" + workingDir);
reader = new Scanner(System.in); // Reading from System.in
System.out.println("Enter a number: ");
n = reader.nextInt(); // Scans the next token of the input as an int.
//once finished
System.out.println("you've enetered: " + n);
reader.close();
hdfs.createNewFile(newFilePath);
StringBuilder sb=new StringBuilder();for(int i=1;i<=5;i++)
{
sb.append("data");
sb.append(i);
sb.append("\n");
}
byte[] byt=sb.toString().getBytes();
FSDataOutputStream fsOutStream = hdfs.create(newFilePath);
fsOutStream.write(byt);
fsOutStream.close();
BufferedReader bfr=new BufferedReader(new InputStreamReader(hdfs.open(newFilePath)));
String str = null;
String finalString="";
while ((str = bfr.readLine())!= null)
{
finalString = finalString + str;
//System.out.println(str);
}
System.out.println(finalString);
try {
path = new Path(args[2]);
FileSystem fileSystem = FileSystem.get(new Configuration());
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fileSystem.open(path)));
String line = bufferedReader.readLine();
while (line != null) {
System.out.println(line);
line = bufferedReader.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
/*try
{
String verify, putData;
FileSystem fileSystem = FileSystem.get(new Configuration());
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(fileSystem.open(path)));
File file = new File("/Dairy.txt");
file.createNewFile();
FileWriter fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fw);
bw.write("I am Shah Khalid");
bw.flush();
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
while( (verify=br.readLine()) != null )
{
if(verify != null)
{
System.out.println(verify);
}
}
br.close();
bw.close();
}
catch(IOException e)
{
e.printStackTrace();
}*/
System.out.println(": complete :");
JobConf confTwo = new JobConf(ProcessUnit.class);
System.out.println("Second job starts :\n = " + args[0] + ", " + args[1] + ", " + args[2] + "\n");
confTwo.setJobName("max_eletricityunits");
confTwo.setOutputKeyClass(Text.class);
confTwo.setOutputValueClass(IntWritable.class);
confTwo.setMapperClass(E_EMapper.class);
confTwo.setCombinerClass(E_EReduce.class);
confTwo.setReducerClass(E_EReduce.class);
confTwo.setInputFormat(TextInputFormat.class);
confTwo.setOutputFormat(TextOutputFormat.class);
fs = FileSystem.get(confTwo);
path = new Path(args[1]);
fs.delete(path);
FileInputFormat.setInputPaths(confTwo, new Path(args[0]/*+"/ss.txt"*/));
FileOutputFormat.setOutputPath(confTwo, new Path(args[1]));
JobClient.runJob(confTwo);
}
}