Apache Spark RDD groupBy transformation
Apache Spark RDD groupBy transformation
As per Apache Spark documentation, groupBy returns an RDD of grouped items where each group consists of a key and a sequence of elements.
Apache Spark RDD groupByKey transformation
Apache Spark RDD groupByKey transformation
groupByKey([numPartitions]) is called on a dataset of (K, V) pairs, and returns a dataset of (K, Iterable) pairs.