Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1241#discussion_r16928153
--- Diff: core/src/main/scala/org/apache/spark/storage/BlockId.scala ---
@@ -59,6 +59,11 @@ case class ShuffleBlockId(shuffleId: Int, mapId: Int,
reduceId: Int) extends Blo
}
@DeveloperApi
+case class ShuffleDataBlockId(shuffleId: Int, mapId: Int, reduceId: Int)
extends BlockId {
--- End diff --
if the reduce id is always 0, why even bother defining it?
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