Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/3032#discussion_r19715256
--- Diff:
core/src/main/scala/org/apache/spark/shuffle/hash/BlockStoreShuffleFetcher.scala
---
@@ -52,21 +53,21 @@ private[hash] object BlockStoreShuffleFetcher extends
Logging {
(address, splits.map(s => (ShuffleBlockId(shuffleId, s._1,
reduceId), s._2)))
}
- def unpackBlock(blockPair: (BlockId, Option[Iterator[Any]])) :
Iterator[T] = {
+ def unpackBlock(blockPair: (BlockId, Try[Iterator[Any]])) :
Iterator[T] = {
val blockId = blockPair._1
val blockOption = blockPair._2
blockOption match {
- case Some(block) => {
+ case Success(block) => {
block.asInstanceOf[Iterator[T]]
}
- case None => {
+ case Failure(e) => {
blockId match {
case ShuffleBlockId(shufId, mapId, _) =>
val address = statuses(mapId.toInt)._1
- throw new FetchFailedException(address, shufId.toInt,
mapId.toInt, reduceId)
+ throw new FetchFailedException(address, shufId.toInt,
mapId.toInt, reduceId, e)
--- End diff --
I tested this patch out locally, and it appears that, sadly, the cause is
actually not propagated correctly back to the driver. I think we can revert
this to the prior Utils.exceptionString() way, that looks good in the UI.
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