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Provide a brief history of Spark? How is Spark better than MapReduce? What is a Spark RDD? What is the meaning of a lazy evaluation

Provide a brief history of Spark?
How is Spark better than MapReduce?
What is a Spark RDD?
What is the meaning of a "lazy evaluation" and what are its benefits?
What are transformations and actions? Give examples of some transformations and actions.
How does Apache Spark compare to Apache Flink?

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