有可能你的TaskTracker无法启动，错误如下，
2013-02-25 15:13:57,208 ERROR org.apache.hadoop.mapred.TaskTracker: Can not start task tracker because java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\local\ttprivate to 0700
at org.apache.hadoop.fs.FileUtil.checkReturnValue(FileUtil.java:689)
at org.apache.hadoop.fs.FileUtil.setPermission(FileUtil.java:662)
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.mapred.TaskTracker.initialize(TaskTracker.java:728)
at org.apache.hadoop.mapred.TaskTracker.<init>(TaskTracker.java:1459)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3742)
这个是Windows下文件权限问题，在Linux下可以正常运行，不存在这样的问题。
解决方法是，修改/hadoop-1.0.2/src/core/org/apache/hadoop/fs/FileUtil.java里面的checkReturnValue，注释掉即可（有些粗暴，在Window下，可以不用检查）：
......privatestaticvoidcheckReturnValue(booleanrv,Filep,FsPermissionpermission)throwsIOException{/** if (!rv) { throw new IOException("Failed to set permissions of path: " + p + " to " + String.format("%04o", permission.toShort())); } **/}......
重新编译打包hadoop-core-1.0.2.jar，替换掉hadoop-1.0.2根目录下的hadoop-core-1.0.2.jar即可。
这里提供一份修改版的hadoop-core-1.0.2-modified.jar文件，替换原hadoop-core-1.0.2.jar即可。
替换之后，刷新项目，设置好正确的jar包依赖，现在再运行WordCountTest，即可。
成功之后，在Eclipse下刷新HDFS目录，可以看到生成了ouput2目录：
相关推荐
ERROR org.apache.hadoop.mapred.TaskTracker: Can not start task tracker because java.io.IOException: Failed to set permissions of path: \tmp\hadoop-admin \mapred\local\ttprivate to 0700 at org.apache...
eclipse远程调试hadoop时 报出eclipse Hadoop Failed to set permissions of path错误 修改hadoop core包中FileUtil java文件 里面有checkReturnValue方法 将代码throw new IOException "Failed to set ...
Failed to set permissions of path: \tmp\hadoop-Administrator，的解决方法，更换hadoop-core-1.0.2-modified.jar包
解决nutch在window系统安装报错问题Exception in thread "main" java.io.IOException: Failed to set permissions of path: \tmp\hadoop-tom\mapred\staging\tom1698089073\.staging to 0700，替换jar包OK！
Exception in thread "main" java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator1702422322\.staging to 0700 这个错误是win中开发特有的错误，文件...
12/04/24 15:32:44 ERROR security.UserGroupInformation: PriviledgedActionException as:Administrator cause:java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\...
windows下搭建nutch会...java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator606301699\.staging to 0700 此jar包是已经注释好 的然后从新编译的jar。
ERROR security.UserGroupInformation: PriviledgedActionException as:chuck cause:java.io.IOException: Failed to set permissions of path: 分析问题： 属于windows下的eclipse中访问的权限问题，需要重新打包...
本包是为了解决在windows下通过cygwin运行hadoop时，执行tasktracker模块时报错Failed to set permissions of path: \mapred\local\ttprivate to 0700，通过修改源代码来解决的包。希望能该问题困扰的童鞋们，提供...
HadoopHA集群 批量启动脚本HadoopHA集群 批量启动脚本HadoopHA集群 批量启动脚本HadoopHA集群 批量启动脚本
格式化namenode时 报错 No Route to Host from node1/192.168.3.101 to hadoop05:8485 failed on socket timeout exception: java.net.NoRouteToHostException: No route to host解决方案 一、报错信息概要: 在配置...
Win环境下本地运行hadoop1版本出现访问权限问题，会遇到如下报错： Exception in thread "main" java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\...
解决hadoop运行在windows下的错误Exception in thread "main" java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator606301699\.staging to 0700
解决nutch 1.9在cgywin中运行报Injector: java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator139727905\.staging to 0700错误的问题，即修改hadoop-...
Moving Hadoop to The Cloud 英文epub 本资源转载自网络，如有侵权，请联系上传者或csdn删除 本资源转载自网络，如有侵权，请联系上传者或csdn删除
hadoop 高可用启动脚本，运行启动zookeeper集群和hadoop ha集群