Hadoop:«错误:JAVA_HOME 未设置» [英] Hadoop: «ERROR : JAVA_HOME is not set»

问题描述

我正在尝试在 Ubuntu 11.10 上安装 Hadoop.我将文件 conf/hadoop-env.sh 中的 JAVA_HOME 变量设置为:

I'm trying to install Hadoop on Ubuntu 11.10. I set the JAVA_HOME variable in the file conf/hadoop-env.sh to:

# export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

然后我执行这些命令(独立操作):

and then I execute these commands (Standalone Operation):

$ mkdir input 
$ cp conf/*.xml input 
$ bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+' 
$ cat output/*

但是我在执行第三个命令时出现以下错误:

but I have the following error when executing the third command:

错误:JAVA_HOME 未设置

ERROR : JAVA_HOME is not set

JAVA_HOME 变量是否设置不正确?

Is the JAVA_HOME variable not set correctly?

推荐答案

请确保您已删除 hadoop-env.shJAVA_HOME> 以及适当的 .bashrc 和/或 .profile:

Make sure that you have removed the comment tag and changed your JAVA_HOME in the hadoop-env.sh as well as the appropriate .bashrc and/or .profile:

# export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

应该是

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk

您可以在 /etc/profile 中为所有用户设置您的 JAVA_HOME 和 PATH(确保您之前没有将其设置为错误的路径).

You can set your JAVA_HOME and PATH for all users (make sure you haven't previously set this to the wrong path) in /etc/profile.

另外，不要忘记通过注销/登录或执行source/etc/profile来激活新的更改.

Also, don't forget to activate the new change by logging-out/in or by executing source /etc/profile.

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