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

最新推荐文章于 2022-06-01 14:41:11 发布

AndersZhuo123

最新推荐文章于 2022-06-01 14:41:11 发布

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分类专栏： hadoop

本文链接：https://blog.youkuaiyun.com/Anders_Zhuo/article/details/8867706

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一个Hadoop小程序：将Hello world写入文件中，简要代码：

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

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。。。。。