Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/2249#discussion_r17095835
--- Diff: graphx/src/main/scala/org/apache/spark/graphx/Graph.scala ---
@@ -262,13 +262,61 @@ abstract class Graph[VD: ClassTag, ED: ClassTag]
protected () extends Serializab
: Graph[VD, ED]
/**
+ * Restricts the graph to only the vertices and edges satisfying the
predicates. The resulting
+ * subgraph satisifies
+ *
+ * {{{
+ * V' = {v : for all v in V where vpred(v)}
+ * E' = {(u,v): for all (u,v) in E where epred((u,v)) && vpred(u) &&
vpred(v)}
+ * }}}
+ *
+ * @param epred the edge predicate, which takes a triplet and
+ * evaluates to true if the edge is to remain in the subgraph. Note
+ * that only edges where both vertices satisfy the vertex
+ * predicate are considered.
+ *
+ * @param vpred the vertex predicate, which takes a vertex object and
+ * evaluates to true if the vertex is to be included in the subgraph
+ *
+ * @param updateRoutingTable whether to rebuild the routingTable in
+ * VertexRDD to reduce the shuffle when shipping VertexAttributes.
+ *
+ * @return the subgraph containing only the vertices and edges that
+ * satisfy the predicates
+ */
+ def subgraph(
+ epred: EdgeTriplet[VD,ED] => Boolean = (x => true),
+ vpred: (VertexId, VD) => Boolean = ((v, d) => true),
+ updateRoutingTable: Boolean)
+ : Graph[VD, ED]
--- End diff --
something wrong here
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