本文介绍了无法运行 hadoop wordcount 示例?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在 vmware 的 ubuntu 12.04 的单节点环境中运行 hadoop wordcount 示例.我像这样运行示例:--
I am running hadoop wordcount example in single node environment on ubuntu 12.04 in vmware.i running the example like this:--
hadoop@master:~/hadoop$ hadoop jar hadoop-examples-1.0.4.jar wordcount
/home/hadoop/gutenberg/ /home/hadoop/gutenberg-output
我在以下位置有输入文件:
i have input file at below location:
/home/hadoop/gutenberg
输出文件的位置是:
/home/hadoop/gutenberg-output
当我运行 wordcount 程序时出现以下错误:--
when i run wordcount program i am getting following errors:--
13/04/18 06:02:10 INFO mapred.JobClient: Cleaning up the staging area
hdfs://localhost:54310/home/hadoop/tmp/mapred/staging/hadoop/.staging/job_201304180554_0001
13/04/18 06:02:10 ERROR security.UserGroupInformation: PriviledgedActionException
as:hadoop cause:org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory
/home/hadoop/gutenberg-output already exists
org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory
/home/hadoop/gutenberg-output already exists at
org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.j
ava:137) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:887) at
org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:850) at
java.security.AccessController.doPrivileged(Native Method) at
javax.security.auth.Subject.doAs(Subject.java:416) at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121) at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:850) at
org.apache.hadoop.mapreduce.Job.submit(Job.java:500) at
org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:530) at
org.apache.hadoop.examples.WordCount.main(WordCount.java:67) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616) at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139) at
org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616) at
org.apache.hadoop.util.RunJar.main(RunJar.java:156) hadoop@master:~/hadoop$ bin/stop-
all.sh Warning: $HADOOP_HOME is deprecated. stopping jobtracker localhost: stopping
tasktracker stopping namenode localhost: stopping datanode localhost: stopping
secondarynamenode hadoop@master:~/hadoop$
推荐答案
删除已经存在的输出文件，或者输出到其他文件.
Delete the output file that already exists, or output to a different file.
(我有点好奇您考虑的错误消息的其他解释.)
(I'm a little curious what other interpretations of the error message you considered.)
这篇关于无法运行 hadoop wordcount 示例?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！