Spark, Spark Core, Rdd, Spark Api.
external process. PairRDD (implicit conversion by PairRDDFunctions) that is an RDD of key-value pairs that is a result of groupByKey and join operations. DoubleRDD (implicit conversion as org.apache.spark.rdd.DoubleRDDFunctions) that is an RDD of Double type. SequenceFileRDD (implicit conversion as