create your own Apache Spark cluster with Hadoop/HDFS installed.

full blog post...

1. install java of course sudo apt-get -y install openjdk-8-jdk-headless default-jre
   • This must be done on all nodes.
2. Install Scala sudo apt install scala
   • I have no idea if this must be done on all nodes, I did.
3. Setup password-less ssh between all nodes.
   • sudo apt install openssh-server openssh-client
4. create keys ssh-keygen -t rsa -P ""
   • move .pub key into each worker nodes ~/.ssh/authorized_keys location.
5. sudo vim /etc/hosts
   • add lines for master and nodes with name and ip address... something like follows.
   • 173.255.199.161 master and maybe 198.58.124.54 worker1
6. Probably want to install Spark on master and nodes.... wget https://archive.apache.org/dist/spark/spark-2.4.3/spark-2.4.3-bin-hadoop2.7.tgz
   • unpack tar xvf spark-2.4.3-bin-hadoop2.7.tgz
   • move sudo mv spark-2.4.3-bin-hadoop2.7/ /usr/local/spark
7. We need to set Spark/Java path etc.... sudo vim ~/.bashrc
   • export PATH=/usr/local/spark/bin:$PATH
   • export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
   • export PATH=$JAVA_HOME/bin:$PATH
   • source ~/.bashrc
8. vim /usr/local/spark/conf/spark-env.sh
   • export SPARK_MASTER_HOST=<master-ip <- fill in your IP address of master node here.
   • export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
9. modify the ridiculously named file vim /usr/local/spark/conf/slaves
   • add names of master and workers from .hosts file above.
   • Finally, start Spark.... sh /usr/local/spark/sbin/start-all.sh

Hadoop

1. wget https://archive.apache.org/dist/hadoop/core/hadoop-2.7.3/hadoop-2.7.3.tar.gz
   • tar -xvf hadoop-2.7.3.tar.gz
   • mv hadoop-2.7.3  hadoop<
2. vim ~/hadoop/etc/hadoop/hadoop-env.sh
   • export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
3. vim ~/hadoop/etc/hadoop/core-site.xml

4. vim ~/hadoop/etc/hadoop/hdfs-site.xml

5. cd ~/hadoop/etc/hadoop
   • mv mapred-site.xml.template mapred-site.xml
   • sudo vim ~/hadoop/etc/hadoop/mapred-site.xml

6. vim ~/hadoop/etc/hadoop/slaves

   • localhost
   • worker1
   • worker2

7. vim ~/hadoop/etc/hadoop/yarn-site.xml

8. sudo vim ~/.bashrc
   • export PATH=/home/beach/hadoop/bin:/home/beach/hadoop/sbin:$PATH