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"Converting Spark RDD to DataFrame and Dataset. Expert opinion."
by Rostislav Pashuto and Vladimir Bustrov
It contains the main example to analyze the customer satisfaction per manager using Spark.
Business problem: “Happy Customers” online support center has 3 managers (Arjun Kumar, Rohit Srivastav, Kabir Vish). Smart internal system randomly picks a manager and assign it to the new client persistently. Unfortunately last week report showed a decrease in a customer satisfaction and you want to start your investigation with an average customer satisfaction per manager.