How to set up hadoop environment variables

hadoop, java, macos

Solution

You could set them as following, last 2 are not mandatory to get HDFS and YARN working though.

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

Problem

I am following this page in the official documentation. I also downloaded hadoop 2.2.0 and placed it under `$HOME/opt`. Now I have this file structure: ``` $ 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: 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 $HADOOP_MAPRED_HOME. So, my question is, given my file structure, how should I set up the hadoop environment variables ($HADOOP_COMMON_HOME, $HADOOP_HDFS_HOME, $HADOOP_YARN_HOME, etc)? Thank you very much.

Original source