Github user watermen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16677#discussion_r102892814
--- Diff: core/src/main/scala/org/apache/spark/MapOutputStatistics.scala ---
@@ -23,5 +23,9 @@ package org.apache.spark
* @param shuffleId ID of the shuffle
* @param bytesByPartitionId approximate number of output bytes for each
map output partition
* (may be inexact due to use of compressed map statuses)
+ * @param numberOfOutput number of output for each pre-map output partition
*/
-private[spark] class MapOutputStatistics(val shuffleId: Int, val
bytesByPartitionId: Array[Long])
+private[spark] class MapOutputStatistics(
+ val shuffleId: Int,
+ val bytesByPartitionId: Array[Long],
+ val numberOfOutput: Array[Int])
--- End diff --
Here, maybe Long is better.
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