Building graphs

Now that we have our data, the next step is to create a graph. Let's fire up the Spark Shell. Run it from the directory where you have installed Spark:

We create the graph in two steps: first we create an RDD list of the vertices and edges, then we create RDDs and eventually the graph. You don't need to type the code; the graphx-0x.scala files have the programs to create a graph and do the rest of the API stuff.

First we create the lists:

Let's quickly run through the code:

case class Person(name:String,age:Int)

val defaultPerson = Person("NA",0)

val vertexList = List( (1L, Person("Alice", 18)), (2L, Person("Bernie", 17)), (3L, Person("Cruz", 15)), (4L, Person("Donald", 12)), (5L, Person("Ed", 15)), (6L, Person("Fran", 10)), (7L, Person("Genghis",854)) )

val edgeList = List( Edge(1L, 2L, 5), Edge(1L, 3L, 1), Edge(3L, 2L, 5), Edge(2L, 4L, 12), Edge(4L, 5L, 4), Edge(5L, 6L, 2), Edge(6L, 7L, 2), Edge(7L, 4L, 5), Edge(6L, 4L, 4) )

Remember the...