November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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Counting the occurrences of each word
The one and only user-visible aggregation in the WordCount pipeline is for counting words (of course):
Count.<String>perElement()
This is a composite transform that is a very thin wrapper on a basic per-key aggregation. The input collection of words is transformed into a collection of key-value pairs, where the key is the word and the value is the integer 1. Then, a per-key sum is performed.
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