hadoop中的问题总结

lyd2004888

　　在做hadoop例子中，Win7远程连接linux服务器上的hadoop 出现一下问题：

12/04/24 15:32:44 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
12/04/24 15:32:44 ERROR security.UserGroupInformation: PriviledgedActionException as:Administrator cause:java.io.IOException: Failed to set permissions of path:
xxxxxxxx
Exception in thread "main" java.io.IOException: Failed to set permissions of path: xxxxxx
at org.apache.hadoop.fs.FileUtil.checkReturnValue(FileUtil.java:682)
at org.apache.hadoop.fs.FileUtil.setPermission(FileUtil.java:655)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:509)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:344)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:189)
at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:116)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:856)
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:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
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
　　经过分析之后，需要修改hadoop的源码，我使用的是hadoop-1.0.4，修改hadoop-core-1.0.4.jar 中对应的org.apache.hadoop.fs.FileUtil 的代码为，如下：

private static void checkReturnValue(boolean rv, File p,
FsPermission permission
) throws IOException {
/**
if (!rv) {
throw new IOException("Failed to set permissions of path: " + p +
" to " +
String.format("%04o", permission.toShort()));
}
**/
}
　　打包之后，重新编译，放到项目中，就可以正常运行了，附件是修改之后，重新编译的hadoop-core-1.0.4.jar