JAVA _Home is not set in Hadoop

Question

I am a beginner with hadoop and trying to install and run hadoop in my Ubuntu as a single node cluster. This is my JAVA_HOME in my hadoop_env.sh

# The java          


        

Answer 1

Above answers should work as long as you are using default conf directory $HADOOP_HOME/conf or $HADOOP_HOME/etc/hadoop. Here are a few things you should do if you're using a different conf folder.

1. Copy the hadoop-env.sh file from the default conf directory to your conf folder, say /home/abc/hadoopConf.

2. Replace the line

   #export JAVA_HOME=${JAVA_HOME}
   

   with the following:

   export JAVA_HOME=/usr/lib/jvm/java-8-oracle
   export HADOOP_CONF_DIR=/home/abc/hadoopConf
   

Change the values appropriately. If you have any other environment variables related to hadoop configured in your .bashrc or .profile or .bash_profile consider adding them next to the above lines.