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What is the difference between a transformation and an action in Spark?

A Transformations are lazy and build a plan; actions trigger execution and return results
B Actions are lazy
C Transformations execute immediately
D They are the same

Answer

Transformations are lazy and build a plan; actions trigger execution and return results

Laziness lets Spark optimise the whole chain before executing, which is why nothing runs until an action such as collect or count is called.

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