Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/6380#discussion_r31975251
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -527,6 +529,54 @@ class StreamingContext private[streaming] (
scheduler.listenerBus.addListener(streamingListener)
}
+ /**
+ * Registers streamingListeners specified in spark.streaming.listeners
+ */
+ private def setupStreamingListeners(): Unit = {
+ // Use reflection to instantiate listeners specified via
`spark.extraListeners`
+ try {
+ val listenerClassNames: Seq[String] =
+ conf.get("spark.streaming.listeners",
"").split(',').map(_.trim).filter(_ != "")
+ for (className <- listenerClassNames) {
+ // Use reflection to find the right constructor
+ val constructors = {
+ val listenerClass = Class.forName(className)
+ listenerClass.getConstructors.asInstanceOf[Array[Constructor[_
<: StreamingListener]]]
+ }
+ val constructorTakingSparkConf = constructors.find { c =>
--- End diff --
I see. It will throw `NoSuchMethodException` and make the code complex.
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