Je ne suis pas en mesure de compiler ma DriverClass à la clause job.waitforcompletion (boolean). Elle me donne une exception NoClassFoundException.Si j'attrape l'exception, la méthode run renvoie l'erreur qu'elle attend une valeur int. J'utilise MapReduce New API.Could quelqu'un suggère ce qui est de la question:Map Réduire le cache distribué
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.KeyValueTextInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
public class Dist_Driver extends Configured implements Tool {
public int run(String args[]) throws IOException, InterruptedException {
// Configuration phase
// Configuration conf=new Configuration();
Job job = new Job(new Configuration());
job.setJarByClass(Dist_Driver.class);
// Mapper Reducer InputFormat
job.setInputFormatClass(FileInputFormat.class);
// Mapper and Reducer Class
job.setMapperClass(Dist_Mapper.class);
job.setReducerClass(DistCache_Reducer.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setInputFormatClass(KeyValueTextInputFormat.class);
// set FileInputOutput
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
// setting number of reduce tasks and submit it
job.setNumReduceTasks(2);
// Lets check if the file exist
File f1 = new File("/home/hdfs/trials_mapreduce_progams/emp_id");
if (f1.exists())
System.out.println("The Files Exists");
else
System.out.println("The File doesnot exist");
URI path1;
try {
path1 = new URI(
"/home/hdfs/trials_mapreduce_progams/emp_lookup.txt");
DistributedCache.addCacheFile(path1, job.getConfiguration());
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (job.waitForCompletion(true))
return 0;
else
return 1;
}
public static void main(String[] args) throws Exception {
int exitcode = ToolRunner.run(new Dist_Driver(), args);
System.exit(exitcode);
}
}