hadoop wordcount示例java.lang.NoClassDefFoundError:hdfs错误

我刚刚安装了Hadoop-2.2.0。我尝试了“>此链接中的WordCount示例，但出现了此错误。如何修复此错误

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

---

我相信您正在寻找的命令是：

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

hdfs-dfs-copyFromLocal in/in

试试看

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

copyFromLocal

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

用法：

hadoop fs-copyFromLocal URI

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Ex:

hadoop$bin/hadoop fs-copyFromLocal in/in

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

---

与put命令类似，只是源代码仅限于本地文件引用。

我认为您是对的。它以前是

hadoop dfs-copyFromLocal URI

，但在新的API中有所更改。所有shell命令都可以在此处找到：

hadoop$ bin/hadoop hdfs -copyFromLocal in /in
Exception in thread "main" java.lang.NoClassDefFoundError: hdfs
Caused by: java.lang.ClassNotFoundException: hdfs
   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:247)