这个是windows本地IDEA里调试一个简单的mapreduce然后报错，这个问题很奇怪，相同的代码，我换了台电脑又可以运行。

首先具体报错是这样的：

Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$POSIX.stat(Ljava/lang/String;)Lorg/apache/hadoop/io/nativeio/NativeIO$POSIX$Stat;
	at org.apache.hadoop.io.nativeio.NativeIO$POSIX.stat(Native Method)
	at org.apache.hadoop.io.nativeio.NativeIO$POSIX.getStat(NativeIO.java:455)
	at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfoByNativeIO(RawLocalFileSystem.java:796)
	at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:710)
	at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:678)
	at org.apache.hadoop.fs.LocatedFileStatus.<init>(LocatedFileStatus.java:52)
	at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:2091)
	at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:2071)
	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:314)
	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:274)
	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:396)
	at org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:310)
	at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:327)
	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:200)
	at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1570)
	at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1567)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729)
	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1567)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1588)
	at com.sunruofei.mr.flow.FlowDriver.main(FlowDriver.java:42)

如果出现这个问题，可以试下下面两种方式：

我本地最开始是版本是hadoop3.1.3

1，把maven中的hadoop版本依赖换成hadoop2.7.7。

2，看下Driver代码中，input的本地路径是不是只到了文件夹。

我d盘下的input就是一个目录，这样就会报错。

解决：把路径具体到文件，程序就可以正常运行了。例如

或者直接带*