eclipse上运行hadoop的worldCount例子时，报错如下：
严重: PriviledgedActionException as:Administrator cause:java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator676474946\.staging to 0700
Exception in thread "main" java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator676474946\.staging to 0700
at org.apache.hadoop.fs.FileUtil.checkReturnValue(FileUtil.java:691)
at org.apache.hadoop.fs.FileUtil.setPermission(FileUtil.java:664)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:514)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:349)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:193)
at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:126)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:942)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:936)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Unknown Source)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:936)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:550)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580)
at com.javacodegeeks.examples.wordcount.WordCount.run(WordCount.java:61)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at com.javacodegeeks.examples.wordcount.WordCount.main(WordCount.java:28)
这个报错只是在windows上才有的权限错误，linux下没有这种报错，可以正常运行。
解决方法是：
从hadoop官网上下载hadoop1.1.2版本，解压后找到hadoop-1.1.2\hadoop-1.1.2\src\core\org\apache\hadoop\fs下的FileUtil.java文件，打开搜索找到Failed to set permissions of path，应该在689行，注释掉它所在的if语句，windows下不用这个检查方法。
如果只是在eclipse上运行，可以直接在运行的项目下建package包org.apache.hadoop.fs，复制修改后的FileUtil.java到该包下，即可正常运行了。
如果不是，那就得打jar包，修改hadoop-1.1.2\build.xml，搜索autoreconf，删除匹配的6个executable="autoreconf"的exec配置，然后使用ant重新生成hadoop-1.1.2\hadoop-core-1.1.2.jar，可以使用新生成的hadoop-core-1.1.2.jar替换有问题的hadoop-core-1.1.2.jar，即可。
