Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16677#discussion_r218614872
--- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
@@ -44,18 +45,23 @@ private[spark] sealed trait MapStatus {
* necessary for correctness, since block fetchers are allowed to skip
zero-size blocks.
*/
def getSizeForBlock(reduceId: Int): Long
+
+ /**
+ * The number of outputs for the map task.
+ */
+ def numberOfOutput: Long
--- End diff --
what does this mean? output blocks? output files?
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