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Explain Spark countByKey() operation?

Question Posted / neha goyal


Explain Spark countByKey() operation?..

Answer / Ram Niwas Paswan

countByKey() is an action that returns the number of occurrences for each unique key in a pair RDD (RDD of (K, V) pairs). The result is a Map[K, Long], where K is the key and Long is the count for each key.

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