Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/3152#discussion_r20258321
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/dstream/UnionDStream.scala
---
@@ -28,17 +28,10 @@ private[streaming]
class UnionDStream[T: ClassTag](parents: Array[DStream[T]])
extends DStream[T](parents.head.ssc) {
- if (parents.length == 0) {
- throw new IllegalArgumentException("Empty array of parents")
- }
-
- if (parents.map(_.ssc).distinct.size > 1) {
- throw new IllegalArgumentException("Array of parents have different
StreamingContexts")
- }
-
- if (parents.map(_.slideDuration).distinct.size > 1) {
- throw new IllegalArgumentException("Array of parents have different
slide times")
- }
+ require(parents.length > 0, "List of DStreams to transform is empty")
--- End diff --
"to union" ... not "to transform" ... i guess a copy past error.
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