Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2844#discussion_r19119178
--- Diff:
core/src/main/scala/org/apache/spark/broadcast/TorrentBroadcast.scala ---
@@ -104,29 +112,23 @@ private[spark] class TorrentBroadcast[T: ClassTag](
for (pid <- Random.shuffle(Seq.range(0, numBlocks))) {
val pieceId = BroadcastBlockId(id, "piece" + pid)
-
- // First try getLocalBytes because there is a chance that previous
attempts to fetch the
+ logDebug(s"Reading piece $pieceId of $broadcastId")
+ // First try getLocalBytes because there is a chance that previous
attempts to fetch the
// broadcast blocks have already fetched some of the blocks. In that
case, some blocks
// would be available locally (on this executor).
- var blockOpt = bm.getLocalBytes(pieceId)
- if (!blockOpt.isDefined) {
- blockOpt = bm.getRemoteBytes(pieceId)
- blockOpt match {
- case Some(block) =>
- // If we found the block from remote executors/driver's
BlockManager, put the block
- // in this executor's BlockManager.
- SparkEnv.get.blockManager.putBytes(
- pieceId,
- block,
- StorageLevel.MEMORY_AND_DISK_SER,
- tellMaster = true)
-
- case None =>
- throw new SparkException("Failed to get " + pieceId + " of " +
broadcastId)
- }
+ val block: ByteBuffer = bm.getLocalBytes(pieceId).getOrElse {
+ bm.getRemoteBytes(pieceId).map { block =>
--- End diff --
to be more explicit, i'm suggesting the old style is easier to understand
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