Question

Which Spark RDD operation returns values after performing the evaluations?

A) Transform
B) Action
C) Cache
D) Filter

Answer 1

The Spark RDD operation that produces a return value after evaluation is an Action. Actions trigger computation on RDDs and return concrete values to the driver program, unlike transformations, which are lazily evaluated.

Step-by-step explanation:

The Spark RDD operation that returns values after performing the evaluations is the Action operation. An Action in Apache Spark is a method that performs computation on RDDs to return values. Common examples of actions include count(), collect(), and reduce(). When an action is called on an RDD, the elements are actually computed and returned to the Spark driver application. Conversely, transformations like filter(), and map() create new RDDs from an existing one, but do not trigger the computation immediately. They are lazily evaluated. The cache() operation is used to persist the RDD in memory to speed up computation.