Github user ankurdave commented on a diff in the pull request:
https://github.com/apache/spark/pull/885#discussion_r13058157
--- Diff:
graphx/src/main/scala/org/apache/spark/graphx/impl/GraphImpl.scala ---
@@ -290,7 +293,7 @@ object GraphImpl {
/**
* Create a graph from a VertexRDD and an EdgeRDD with the same
replicated vertex type as the
- * vertices.
+ * vertices. The VertexRDD must already be set up for efficient joins
with the EdgeRDD.
--- End diff --
Done.
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