運作MapReduce程式出現org.apache.hadoop.io.nativeio.NativeIO$POSIX.stat(Ljava/lang/String

當運作MapReduce程式時出現如下錯誤：

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)
           

主要原因是 你的輸入路徑是檔案夾，不是檔案

解決方法：

比如你的路徑為： D:\input

如果你想要計算input下的檔案，就必須加個 “*”，否則會報如上的錯

正确寫法： D:\input\*