Question

ubuntu上的hadoop单机伪分布，运行Wordcount时候出错，急求大神解答

14/03/12 16:17:41 ERROR security.UserGroupInformation: PriviledgedActionException as:root cause:org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security.AccessControlException: Permission denied: user=root, access=WRITE, inode="staging":dandan:supergroup:rwxr-xr-x
org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security.AccessControlException: Permission denied: user=root, access=WRITE, inode="staging":dandan:supergroup:rwxr-xr-x
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

Caused by: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.security.AccessControlException: Permission denied: user=root, access=WRITE, inode="staging":dandan:supergroup:rwxr-xr-x
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check

Answer 1

是权限问题。可以选择关闭hadoop权限，在hdfs-site.xml文件中添加
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
关闭hadoop权限管理。
再不行请切换到root用户操作