Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/6707#discussion_r32297750
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/ReceivedBlockHandler.scala
---
@@ -199,3 +223,16 @@ private[streaming] object
WriteAheadLogBasedBlockHandler {
new Path(checkpointDir, new Path("receivedData",
streamId.toString)).toString
}
}
+
+/**
+ * A utility that will wrap the Iterator to get the count
+ */
+private class CountingIterator[T](iterator: Iterator[T]) extends
Iterator[T] {
+ var count = 0
+ def hasNext(): Boolean = iterator.hasNext
+ def isFullyConsumed: Boolean = !iterator.hasNext
--- End diff --
As a good design pattern, could you put the count as a private variable
(rename as _count) and then make public def count() which checks if it is fully
consumed and returns Some(_count) or None?
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