Question - How Is Hadoop CLASSPATH essential to start or stop Hadoop daemons?
Answer -
CLASSPATH includes necessary directories that contain jar files to start or stop Hadoop daemons. Hence, setting CLASSPATH is essential to start or stop Hadoop daemons.
However, setting up CLASSPATH every time is not the standard that we follow. Usually CLASSPATH is written inside /etc/hadoop/hadoop-env.sh file. Hence, once we run Hadoop, it will load the CLASSPATH automatically.