编写TokenizerMapper权限时Hadoop“出错”

Question

I am using Google Developer Console for running the Hadoop example "WordCount". The error I am getting when I run hadoop com.sun.tools.javac.Main WordCount.java is:

WordCount.java:26: error: error while writing TokenizerMapper: 
WordCount$TokenizerMapper.class (Permission denied)
public static class TokenizerMapper

There is an arrow pointing to class of the last line.
echo $HADOOP_CLASSPATH returns /usr/lib/jvm/java-7-openjdk-amd64/lib/tools.jar
echo $HADOOP_HOME returns /home/hadoop/hadoop-install
echo $JAVA_HOME returns /usr/lib/jvm/java-7-openjdk-amd64/jre
javac -version returns javac 1.6.0_36
java -version returns java version "1.6.0_36" OpenJDK Runtime Environment (IcedTea6 1.13.8) (6b36-1.13.8-1~deb7u1) OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)

I changed the permissions on the javac file to be 777 and WordCount.java but nothing happened.

Answer 1

This was a terrible work around and I do not recommend it but I changed the permission of the /home/hadoop directory to 777 and it works. I couldn't find where TokenizedMapper resided in my user file. This is a terrible option but I am accepting it in order to close the question

Answer 2

For the ones who had made hadoop installation with creating different hadoop user, make sure that your WordCount.java file also resides in the same hadoop installation directory (in my case "/usr/local/hadoop/"). Otherwise Hadoop will not get permission to access that java file.

Answer 3

如果不工作则以root身份编译它你必须为你的hadoop用户提供正确和安全的root权限你可以通过编辑/ etc / sudoers来实现