January 2019
Beginner to intermediate
154 pages
4h 31m
English
Content preview from Apache Spark Quick Start Guide
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reduce()
The reduce() action combines the RDD elements in parallel and gives aggregated results as output. In the following example, we calculate the sum of the first 10 natural numbers:
//Scalaspark.sparkContext.parallelize(1 to 10).reduce( _ + _ )res1: Int = 55
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