Hi,
If a vertex has no in-degree then Spark's GraphOp 'inDegree' does not return
it at all. Instead, it would be very useful to me to be able to have that
vertex returned with an in-degree of zero.
What's the best way to achieve this using the GraphX API?
For example, given a graph with nodes
You can do this using leftJoin, as collectNeighbors [1] does:
graph.vertices.leftJoin(graph.inDegrees) {
(vid, attr, inDegOpt) = inDegOpt.getOrElse(0)
}
[1]
https://github.com/apache/spark/blob/master/graphx/src/main/scala/org/apache/spark/graphx/GraphOps.scala#L145
Ankur
On Sun, Jan 25,
