January 2019
Beginner to intermediate
154 pages
4h 31m
English
Content preview from Apache Spark Quick Start Guide
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mapVertices
The mapVertices() method can be used to map the properties of each vertex of a given graph. The following example shows the usage of mapVertices():
//Scala//Prefixing 'Hi' with each nameval newGraph = graph.mapVertices((VertexId, name) => "Hi "+name )
The mapVertices() operation is similar to the mapValues() transformation. In the previous example, we just added 'Hi' to each name of the vertex.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.