Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19763#discussion_r152908363
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -485,4 +485,13 @@ package object config {
"array in the sorter.")
.intConf
.createWithDefault(Integer.MAX_VALUE)
+
+ private[spark] val SHUFFLE_MAP_OUTPUT_PARALLEL_AGGREGATION_THRESHOLD =
+ ConfigBuilder("spark.shuffle.mapOutput.parallelAggregationThreshold")
+ .internal()
+ .doc("Multi-thread is used when the number of mappers * shuffle
partitions is greater than " +
+ "or equal to this threshold.")
--- End diff --
From above `statuses.length.toLong * totalSizes.length /
parallelAggThreshold + 1`, looks like we need to have at least two times of
this threshold to enable this parallel aggregation?
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