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R Data Analysis Cookbook - Second Edition by Kuntal Ganguly

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The entry point to SparkR is the SparkSession object, which represents the connection to the Spark cluster. The node on which R is running becomes the driver. Any objects created by the R program reside on this node. At the moment, R cannot be used to manipulate the RDDs of Spark directly. Therefore, for all practical purposes, the R API for Spark only has access to Spark SQL abstractions.

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