Changes

GPU621/Apache Spark Fall 2022

618 bytes added, 21:52, 3 December 2022

→‎Apache Spark Core API

// map from one RDD to another RDD

JavaRDD<Double> mapRDD = javaRDD.map(value -> Math.sqrt(value));

// 3.3166247903554, 4.69041575982343, 5.744562646538029, 6.6332495807108

mapRDD.foreach(value->System.out.println(value));

1.2 filter(func)

filter() is used when we only want some elements that meet the conditions. When we use this function, we need to pass another predicate function.

//create input data list

List<Integer> inputData = new ArrayList<>();

inputData.add(11);

inputData.add(22);

inputData.add(33);

inputData.add(44);

// create RDD

JavaRDD<Integer> javaRDD = sc.parallelize(inputData);

//use filter

JavaRDD<Double> filterRDD = javaRDD.filter(value ->value>=30);

// 33 44

filterRDD.foreach(value->System.out.println(value));

==Deploy Apache Spark Application On AWS==

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