Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/2538#discussion_r18201664 --- Diff: streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala --- @@ -413,7 +413,7 @@ class StreamingContext private[streaming] ( dstreams: Seq[DStream[_]], transformFunc: (Seq[RDD[_]], Time) => RDD[T] ): DStream[T] = { - new TransformedDStream[T](dstreams, sparkContext.clean(transformFunc)) + new TransformedDStream[T](dstreams, transformFunc) --- End diff -- Without this change, ssc.transform() will failed to serialize transformFunc, because the callback function from python is not serializable.
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