Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/4875#discussion_r25980986
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaDStream.scala
---
@@ -83,6 +86,24 @@ class JavaDStream[T](val dstream: DStream[T])(implicit
val classTag: ClassTag[T]
dstream.window(windowDuration, slideDuration)
/**
+ * Return a new DStream in which each RDD contains all the elements in
seen in a
+ * sliding window of time over this DStream.
+ * @param windowDuration width of the window; must be a multiple of this
DStream's
+ * batching interval
+ * @param slideDuration sliding interval of the window (i.e., the
interval after which
+ * the new DStream will generate RDDs); must be a
multiple of this
+ * DStream's batching interval
+ * @param initialWindow initial window values to prepend starting with
the oldest entry
+ */
+ def window(windowDuration: Duration,
--- End diff --
Same question as below, why optional?
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