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Hadoop Installation
Essential prerequisites:

yum install -y java

#create hadoop user

useradd hadoop
passwd hadoop

#Access to Hadoop user as super user

visudo

#Login Hadoop user

su - hadoop
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cp -r ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
chmod 0600 ~/.ssh/authorized_keys

#ssh working
ssh localhost (type yes when ask)
exit

#Download Hadoop (version) Archive
wget https://archive.apache.org/dist/hadoo...

#extract file
tar xvf hadoop-3.1.0.tar.gz
#rename file
mv hadoop-3.1.0 hadoop

Setup Hadoop Pseudo-Distributed Mode
Setup Hadoop Environment Variables
Update Java Alternatives.
sudo update-alternatives --config java

First, we need to set environment variable uses by Hadoop. Edit ~/.bashrc file and append following values at end of file.
vi ~/.bashrc
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.275.b01-6.fc33.x86_64/jre(Replace with your java path)
export HADOOP_HOME=/home/hadoop/hadoop
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin

Now apply the changes in the current running environment
source ~/.bashrc

#edit environment
vi /home/hadoop/hadoop/etc/hadoop/hadoop-env.sh

#find export JAVA_HOME

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-4.el8.x86_64/jre/(replace with your java path)

#Setup Hadoop Configuration Files

cd /home/hadoop/hadoop/etc/hadoop
Configuration file to edit
Click on the below link to find code:-
https://datasciencetheory.blogspot.co...

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