Java 如何设置hadoop环境变量
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How to set up hadoop environment variables
提问by JBT
I am following this pagein the official documentation. I also downloaded hadoop 2.2.0 and placed it under $HOME/opt. Now I have this file structure:
我在官方文档中关注此页面。我还下载了 hadoop 2.2.0 并将其放在$HOME/opt. 现在我有这个文件结构：
$ ls -1 ~/opt/hadoop-2.2.0/
LICENSE.txt
NOTICE.txt
README.txt
bin/
etc/
include/
lib/
libexec/
sbin/
share/
$ ls -1 ~/opt/hadoop-2.2.0/share/hadoop/
common/
hdfs/
httpfs/
mapreduce/
tools/
yarn/
In the page I mentioned above, there is this paragraph:
在我上面提到的页面中，有这么一段：
Assuming you have installed hadoop-common/hadoop-hdfs and exported $HADOOP_COMMON_HOME/$HADOOP_HDFS_HOME, untar hadoop mapreduce tarball and set environment variable $HADOOP_MAPRED_HOME to the untarred directory. Set $HADOOP_YARN_HOME the same as $HADOOP_MAPRED_HOME.
假设您已经安装了 hadoop-common/hadoop-hdfs 并导出了 $HADOOP_COMMON_HOME/$HADOOP_HDFS_HOME，解压 hadoop mapreduce tarball 并将环境变量 $HADOOP_MAPRED_HOME 设置到解压目录。将 $HADOOP_YARN_HOME 设置为与 $HADOOP_MAPRED_HOME 相同。
So, my question is, given my file structure, how should I set up the hadoop environment variables ($HADOOP_COMMON_HOME, $HADOOP_HDFS_HOME, $HADOOP_YARN_HOME, etc)? Thank you very much.
所以，我的问题是，鉴于我的文件结构，我应该如何设置 hadoop 环境变量（$HADOOP_COMMON_HOME、$HADOOP_HDFS_HOME、$HADOOP_YARN_HOME 等）？非常感谢。
采纳答案by zhutoulala
You could set them as following, last 2 are not mandatory to get HDFS and YARN working though.
您可以将它们设置如下，但最后 2 个不是让 HDFS 和 YARN 工作所必需的。
HADOOP_COMMON_HOME=$HOME/opt/hadoop-2.2.0/
HADOOP_HDFS_HOME=$HOME/opt/hadoop-2.2.0/share/hadoop/hdfs
HADOOP_YARN_HOME=$HOME/opt/hadoop-2.2.0/share/hadoop/yarn
