Scala and Spark for Big Data Analytics

VertexRDD

As seen earlier, the VertexRDD is an RDD containing the vertices and their associated attributes. Each element in the RDD represents a vertex or node in the graph. In order to maintain the uniqueness of the vertex, we need to have a way of assigning a unique ID to each of the vertexes. For this purpose, GraphX defines a very important identifier known as VertexId.

VertexId is defined as a 64-bit vertex identifier that uniquely identifies a vertex within a graph. It does not need to follow any ordering or any constraints other than uniqueness.

The declaration of VertexId is as follows as simply an alias for a 64-bit Long number:

type VertexId = Long

The VertexRDD extends an RDD of a pair of VertexID and vertex attributes represented ...