Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14137#discussion_r70635683
--- Diff:
graphx/src/main/scala/org/apache/spark/graphx/lib/StronglyConnectedComponents.scala
---
@@ -64,11 +69,20 @@ object StronglyConnectedComponents {
// write values to sccGraph
sccGraph = sccGraph.outerJoinVertices(finalVertices) {
(vid, scc, opt) => opt.getOrElse(scc)
- }
+ }.cache()
+ // take triplet to materialize vertices and edges (faster then
count on both)
+ sccGraph.triplets.take(1)
--- End diff --
It's faster because it only materializes a single partition. I think you
have to call something like count.
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