Spark, Spark Core, Rdd, Spark Api.
a result of calling operations like map, flatMap, filter, mapPartitions, etc. CoalescedRDD — a result of repartition or coalesce transformations. ShuffledRDD — a result of shuffling, e.g. after repartition or coalesce transformations. PipedRDD — an RDD created by piping elements to a forked