org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist:

已验证

一个Hadoop小程序：将Hello world写入文件中，简要代码：

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public static void main(String[] args) throws Exception {  
        Configuration conf = new Configuration();  
        Job job = new Job(conf,"demo");  
        job.setJarByClass(HelloWorld.class);  
        job.setMapperClass(MyMapper.class);  
        job.setCombinerClass(MyReducer.class);  
        job.setReducerClass(IntSumReducer.class);  
        job.setOutputKeyClass(Text.class);  
        job.setOutputValueClass(IntWritable.class);  
        FileInputFormat.addInputPath(job,new Path("/anders/passwd"));  
        FileOutputFormat.setOutputPath(job, new Path("/anders/out1"));  
        System.exit(job.waitForCompletion(true) ? 0 : 1);  
    }  

mapper reducer 不上了……
用eclipse 运行：run on hadoop出现

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Exception in thread "main" org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/anders/passwd  
    at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:235)  
    at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:252)  
    at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:962)  
    at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:979)  
    at org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:174)  
    at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:897)  
    at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:850)  
    at java.security.AccessController.doPrivileged(Native Method)  
    at javax.security.auth.Subject.doAs(Subject.java:415)  
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)  
    at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:850)  
    at org.apache.hadoop.mapreduce.Job.submit(Job.java:500)  
    at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:530)  
    at cn.sdu.hadoop.HelloWorld.main(HelloWorld.java:58)  

就是文件路径不对，google一下

修改代码：

FileInputFormat.addInputPath(job,new Path("hdfs://localhost:9000/anders/passwd"));

 FileOutputFormat.setOutputPath(job, new Path("hdfs://localhost:9000/anders/out1"));

这样才能正确，这个路径是根据core-site.xml里面的fs.default.name

这回就可以用eclipse运行了。。。。。