hadoop之MapReduce编程的权限问题

最新推荐文章于 2024-04-26 09:51:23 发布

戴桥冰

最新推荐文章于 2024-04-26 09:51:23 发布

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分类专栏： hadoop1.x.x 问题解决文章标签： hadoop 编程

本文链接：https://blog.youkuaiyun.com/qq_21178933/article/details/48932401

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在执行Hadoop MapReduce任务时遇到了权限警告和错误，具体表现为无法设置 staging 目录的权限。错误信息涉及到NativeCodeLoader、UserGroupInformation和JobSubmissionFiles等。解决方法包括对FileUtil.java源码进行修改，注释掉特定代码，以及重新打包hadoop-core库以替换原有jar包。

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问题描述：

15/10/06 16:46:53 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
15/10/06 16:46:53 ERROR security.UserGroupInformation: PriviledgedActionException as:Administrator cause:java.io.IOException: Failed to set permissions of path: \opt\data\hadoop\tmp\mapred\staging\Administrator1031870944\.staging to 0700
Exception in thread "main" java.io.IOException: Failed to set permissions of path: \opt\data\hadoop\tmp\mapred\staging\Administrator1031870944\.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(Subject.java:396)
   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.hadoop.study.WordCount.main(WordCount.java:103)

解决办法：

      1.在目录下找到FileUtil.java文件，在MapReduce工程中新建一个包：org.apache.hadoop.fs。并且把FileUtil.java文件复制到该包下，找到checkReturnValue方法，然后把该方法中的    if (!rv) {
      throw new IOException("Failed to set permissions of path: " + p +
                            " to " +
                            String.format("%04o", permission.toShort()));
    }