Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11284#discussion_r53562158
--- Diff:
graphx/src/main/scala/org/apache/spark/graphx/lib/StronglyConnectedComponents.scala
---
@@ -36,7 +36,7 @@ object StronglyConnectedComponents {
* @return a graph with vertex attributes containing the smallest vertex
id in each SCC
*/
def run[VD: ClassTag, ED: ClassTag](graph: Graph[VD, ED], numIter: Int):
Graph[VertexId, ED] = {
-
+ require(numIter > 0)
--- End diff --
I think you'd need to add an error message, e.g.
s"Number of iterations ($numIter) must be greater than 0."
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