在学习MapReduce时报错了详见日志

Question

Exception in thread “main” java.lang.RuntimeException: java.io.FileNotFoundException: java.io.FileNotFoundException: HADOOP_HOME and hadoop.home.dir are unset. -see https://wiki.apache.org/hadoop/WindowsProblems
at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:716)
at org.apache.hadoop.util.Shell.getSetPermissionCommand(Shell.java:250)
at org.apache.hadoop.util.Shell.getSetPermissionCommand(Shell.java:267)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:771)
at org.apache.hadoop.fs.RawLocalFileSystem.mkOneDirWithMode(RawLocalFileSystem.java:515)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission(RawLocalFileSystem.java:555)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:533)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:320)
at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:146)
at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1341)
at org.apache.hadoop.mapreduce.Job$11.run(Job.java:1338)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1844)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1338)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1359)
at com.imooc.bigdata.hadoop.mr.wc.WordCountApp.main(WordCountApp.java:52)

Answer 1

Michael_PK 2020-02-10 10:16:31

你是win机器把， java.io.FileNotFoundException: HADOOP_HOME and hadoop.home.dir are unset. win机器也要下载配置下