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Designing Data-Intensive Applications Book: MongoDB Map-Reduce example rewritten in Spark
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| val monthySharkReport = observations | |
| .filter(_.family == "Sharks") | |
| .map { o => | |
| val year = o.observationTimestamp.getYear | |
| val month = o.observationTimestamp.getMonthOfYear | |
| (year, month) -> o.numAnimals | |
| } | |
| .reduceByKey(_ + _) | |
| .collect() |
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