单机mapreduce:
package com.test.mryinru;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class MySingleWordCount {
public static void main(String[] args) throws Exception {
FileSystem fs = FileSystem.get(new URI("hdfs://marshal:9000"),new Configuration(),"root");
FSDataInputStream in = fs.open(new Path("/wordcount/input/a.txt"));
BufferedReader br = new BufferedReader(new InputStreamReader