sudo update-alternatives --config javac
sudo update-alternatives --config java
openjdk version "1.8.0_171"
pom xml //add compiler plugin
mvn package
spark-submit --class "SimpleApp" --master local[4] target/simple-project-1.0.jar
hadoop fs -ls /tmp hadoop put,rm etc
HDFS - 0.55 sec, S3 took 23.6 sec