Titan: Remove all connected Vertices

Question

I have following graph

   Vertex v1 = g.addVertex(null);
   Vertex v2 = g.addVertex(null);
   Vertex v3 = g.addVertex(null);
   v1.addEdge("v1v2", v2);
   v2.addEdge("v2v3", v3);

If I remove v2 vertex, v1v2 v2v3 edge is deleted but v1 v3 vertex remain in graph. Will I have to remove v1 and v3 manually?

If I add another vertex:

Vertex v4 = g.addVertex(null);
v3.addEdge("v3v4", v4);

Vertex v5 = g.addVertex(null);
v5.addEdge("v5v3", v3);

Now If I will delete v1 all vertices should be deleted. How to do that? Does titan provide something for this?

Answer 1

Titan doesn't provide anything that can detect orphaned vertices. You will have to write your own approach to doing so. I suppose you have at least two ways to deal with them.

1. If there's no harm in just leaving them there based on your schema/application, then let them remain orphaned. Then batch remove them with Faunus or some other script.

2. Make removal of a v2 in your first example, part of a transaction that does some quick edge checks on v1 and v3. If neither of those have edges then remove those vertices as well.