Remote.java

import java.io.IOException;
import java.security.PrivilegedExceptionAction;
import java.util.Iterator;
import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.TextInputFormat;
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

public class WordCountRemote extends Configured implements Tool {

	public static final String inputPath = "/in";
	public static final String outputPath = "/out";

	public static class Map extends MapReduceBase implements
			Mapper<LongWritable, Text, Text, IntWritable> {
		private final static IntWritable one = new IntWritable(1);
		private final Text word = new Text();

		@Override
		public void map(LongWritable key, Text value,
				OutputCollector<Text, IntWritable> output, Reporter reporter)
				throws IOException {
			String line = value.toString();
			StringTokenizer tokenizer = new StringTokenizer(line);
			while (tokenizer.hasMoreTokens()) {
				// 设置分割的字符放到
				word.set(tokenizer.nextToken());
				System.out.println("Map--->键(文本):->" + String.valueOf(word)
						+ "   " + "值(个数):->" + one);
				output.collect(word, one);
			}
		}
	}

	public static class Reduce extends MapReduceBase implements
			Reducer<Text, IntWritable, Text, IntWritable> {
		@Override
		public void reduce(Text key, Iterator<IntWritable> values,
				OutputCollector<Text, IntWritable> output, Reporter reporter)
				throws IOException {
			int sum = 0;
			while (values.hasNext()) {
				sum += values.next().get();
			}
			System.out.println("Reduce--->键(文本):->" + String.valueOf(key)
					+ "   " + "值(个数):->" + sum);
			output.collect(key, new IntWritable(sum));
		}
	}

	@Override
	public int run(String[] args) throws Exception {
		// http://stackoverflow.com/questions/22231904/running-hadoop-job-remotely
		UserGroupInformation ugi = UserGroupInformation
				.createRemoteUser("cloudera");
		try {

			ugi.doAs(new PrivilegedExceptionAction<Void>() {

				@Override
				public Void run() throws Exception {

					Configuration config = new Configuration();
					config.set("fs.default.name", "hdfs://192.168.161.138:8020");
					config.set("mapred.job.tracker", "192.168.161.138:8021");
					config.set("hadoop.job.ugi", "cloudera");
					config.set("user.name", "cloudera");
					JobConf conf = new JobConf(config, WordCount.class);
					conf.setJobName("WordCountNew");
					conf.setOutputKeyClass(Text.class);
					conf.setOutputValueClass(IntWritable.class);

					conf.setMapperClass(Map.class);
					conf.setReducerClass(Reduce.class);

					conf.setInputFormat(TextInputFormat.class);
					conf.setOutputFormat(TextOutputFormat.class);

					FileInputFormat
							.setInputPaths(
									conf,
									new Path(
											"hdfs://192.168.161.138:8020/user/cloudera/input/word.txt"));
					FileOutputFormat
							.setOutputPath(
									conf,
									new Path(
											"hdfs://192.168.161.138:8020/user/cloudera/output"));
					JobClient.runJob(conf);
					return null;
				}
			});

		} catch (Exception e) {
			e.printStackTrace();
		}
		return 0;
	}

	public static void main(String[] args) throws Exception {
		Configuration config = new Configuration();
		config.set("fs.default.name", "hdfs://192.168.161.138:8020");
		config.set("mapred.job.tracker", "192.168.161.138:8021");
		config.set("hadoop.job.ugi", "cloudera");
		config.set("user.name", "cloudera");
		int res = ToolRunner.run(config, new WordCountRemote(), args);
		System.exit(res);
	}
}