Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19763#discussion_r151962620
--- 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_STATISTICS_PARALLEL_AGGREGATION_THRESHOLD =
+
ConfigBuilder("spark.shuffle.mapOutputStatistics.parallelAggregationThreshold")
+ .internal()
+ .doc("Multi-thread is used when the number of mappers * shuffle
partitions exceeds this " +
+ "threshold")
+ .intConf
+ .createWithDefault(100000000)
--- End diff --
wow 100 million is really a large threshold, how do you pick this number?
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