RDD #3: All About Pair RDDs in Spark | Pair RDD | flatMap() Vs map()

Описание к видео RDD #3: All About Pair RDDs in Spark | Pair RDD | flatMap() Vs map()

Pair RDD : Is Key value pair RDD
(key , value),
(Key,Value)

Create Pair RDD :
1. From Regular RDD
2. With In-memory collection (with Parallelize directly)

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Pair RDD Functions :
reduceByKey
countByKey
countByValue

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Scenarios :

How many times each word is repeated in the given document ?

Totale sales amount by product (by key) ?


Count of by key ?


Count By value ?


flatMap() Vs map()


flatMap : each element of RDD


map: On each row of rdd

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