Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/4875#discussion_r25980966
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaPairDStream.scala
---
@@ -101,6 +101,23 @@ class JavaPairDStream[K, V](val dstream: DStream[(K,
V)])(
dstream.window(windowDuration, slideDuration)
/**
+ * Return a new DStream which is computed based on windowed batches of
this DStream.
+ * @param windowDuration duration (i.e., width) of the window;
+ * must be a multiple of this DStream's 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 interval
+ * @param initialWindow initial window values to prepend starting with
the oldest entry
+ */
+ def window(windowDuration: Duration,
+ slideDuration: Duration,
+ initialWindow: Optional[JList[JavaPairRDD[K, V]]]):
JavaPairDStream[K, V] =
--- End diff --
Why is this an option? There is already a version of window where you dont
have to specify the initial RDDs.
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