Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/6614#discussion_r31703406
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/ReceiverSupervisorImpl.scala
---
@@ -136,14 +136,18 @@ private[streaming] class ReceiverSupervisorImpl(
metadataOption: Option[Any],
blockIdOption: Option[StreamBlockId]
) {
+ var rBlock = receivedBlock
val blockId = blockIdOption.getOrElse(nextBlockId)
val numRecords = receivedBlock match {
case ArrayBufferBlock(arrayBuffer) => arrayBuffer.size
+ case IteratorBlock(iterator) =>
+ var arrayBuffer = ArrayBuffer(iterator.toArray : _*)
--- End diff --
This is quite inefficient, as the data will be first copied to the
arraybuffer, and then BlockManager will again use the ArrayBuffer's iterator to
store the data. This is precisely why this wasnt done till now. :(
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