Kai Zhang highlighted sc.parallelize(data).reduceByKey((x, y) => x + y)... from Learning Spark

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sc.parallelize(data).reduceByKey((x, y) => x + y)

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4. Working with Key/Value Pairs
from Learning Spark
by Matei Zaharia, Patrick Wendell, Andy Konwinski, Holden Karau
Publisher: O'Reilly Media, Inc.
Released: February 2015

Note

This probably should be "sc.parallelize(data, SomeNumber).reduceByKey((x, y) => x + y)"

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http://www.safaribooksonline.com/a/learning-spark/10303167/