January 2019
Beginner to intermediate
154 pages
4h 31m
English
Content preview from Apache Spark Quick Start Guide
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count()
Use count() to count the number of elements in the RDD. The following Scala code counts the number of an RDD and returns 10 as output:
//scalaspark.sparkContext.parallelize(1 to 10).count()res17: Long = 10
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