Github user ankurdave commented on a diff in the pull request:
https://github.com/apache/spark/pull/5175#discussion_r27092877
--- Diff: graphx/src/main/scala/org/apache/spark/graphx/VertexRDD.scala ---
@@ -122,6 +122,14 @@ abstract class VertexRDD[VD](
def mapValues[VD2: ClassTag](f: (VertexId, VD) => VD2): VertexRDD[VD2]
/**
+ * For each VertexId present in both `this` and `other`, minus will act
as a set difference
+ * operation returning only those unique VertexId's present in `this`.
+ *
+ * @param other an RDD to run the set operation against
+ */
+ def minus(other: RDD[(VertexId, VD)]): VertexRDD[VD]
--- End diff --
It would be good to add a version that takes a VertexRDD, similar to the
other methods below. That way we could avoid calling createUsingIndex when we
already have two VertexRDDs that share the same index.
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