Using reduceByKey in Apache Spark (Scala)

Question

I have a list of Tuples of type : (user id, name, count).

For example,

val x = sc.parallelize(List(
    (\"a\", \"b\", 1),
    (\"a\", \"b\", 1),
           


        

Answer 1

The syntax is below:

reduceByKey(func: Function2[V, V, V]): JavaPairRDD[K, V],

which says for the same key in an RDD it takes the values (which will be definitely of same type) performs the operation provided as part of function and returns the value of same type as of parent RDD.