Not able to use sc in spark shell

Question

I have installed Hadoop, apache spark and scala succesfully. But when I try to open spark shell and use sc, I am getting error

Error:

Answer 1

Seems like master and worker are not running. You have to start the Master and the Worker nodes before invoking the Spark shell. Follow the below step to do the same.

Change the directory to sbin and give the start command. 

cd $HADOOP_HOME/sbin
./start-all.sh

Give the spark-shell command to invoke the spark shell and sc should work