環境：

window7 64位

叢集hadoop2.6.0，ubuntu

window上連線叢集跑hadoop問題之java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.$Windows.

參照http://blog.csdn.net/congcong68/article/details/42043093即可解決

主要在修改NativeIO檔案

在project下新建package：org.apache.hadoop.io.nativeio

將NativeIO.java檔案copy過來。

修改557行：

    	return true;
//      return access0(path, desiredAccess.accessRight());
 

//public class WordCount {
//
//}

import java.io.IOException;  
import java.util.StringTokenizer;  
  
import org.apache.hadoop.conf.Configuration;  
import org.apache.hadoop.fs.Path;  
import org.apache.hadoop.io.IntWritable;  
import org.apache.hadoop.io.Text;  
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.FileInputFormat;  
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;  
  
public class WordCount {  
  
  public static class TokenizerMapper  
       extends Mapper<Object, Text, Text, IntWritable>{  
  
    private final static IntWritable one = new IntWritable(1);  
    private Text word = new Text();  
  
    public void map(Object key, Text value, Context context  
                    ) throws IOException, InterruptedException {  
      StringTokenizer itr = new StringTokenizer(value.toString());  
      while (itr.hasMoreTokens()) {  
        word.set(itr.nextToken());  
        context.write(word, one);  
      }  
    }  
  }  
  
  public static class IntSumReducer  
       extends Reducer<Text,IntWritable,Text,IntWritable> {  
    private IntWritable result = new IntWritable();  
  
    public void reduce(Text key, Iterable<IntWritable> values,  
                       Context context  
                       ) throws IOException, InterruptedException {  
      int sum = 0;  
      for (IntWritable val : values) {  
        sum += val.get();  
      }  
      result.set(sum);  
      context.write(key, result);  
    }  
  }  
  
  public static void main(String[] args) throws Exception {  
    Configuration conf = new Configuration();  
    Job job = Job.getInstance(conf, "word count");  
    job.setJarByClass(WordCount.class);  
    job.setMapperClass(TokenizerMapper.class);  
    job.setCombinerClass(IntSumReducer.class);  
    job.setReducerClass(IntSumReducer.class);  
    job.setOutputKeyClass(Text.class);  
    job.setOutputValueClass(IntWritable.class);  
    FileInputFormat.addInputPath(job, new Path(args[0]));  
    FileOutputFormat.setOutputPath(job, new Path(args[1]));  
    System.exit(job.waitForCompletion(true) ? 0 : 1);  
  }  
} 
 

hdfs://219.219.220.149:9000/input
hdfs://219.219.220.149:9000/output0126

結果檔案：