March 2019
Beginner to intermediate
182 pages
4h 6m
English
Content preview from Hands-On Big Data Analytics with PySpark
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Calculating the degree of the vertex
In this section, we will cover the total degree, then we'll split it into two parts—an in-degree and an out-degree—and we will understand how this works in the code.
For our first test, let's construct the graph that we already know about:
package com.tomekl007.chapter_7import org.apache.spark.SparkContextimport org.apache.spark.graphx.{Edge, Graph, VertexId}import org.apache.spark.rdd.RDDimport org.apache.spark.sql.SparkSessionimport org.scalatest.FunSuiteimport org.scalatest.Matchers._class CalculateDegreeTest extends FunSuite { val spark: SparkContext = SparkSession.builder().master("local[2]").getOrCreate().sparkContext test("should calculate degree of vertices") { //given val users: RDD[(VertexId, ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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