Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19763#discussion_r151962448
--- 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 =
--- End diff --
`spark.adaptive.map.statistics.cores` should also be a config entry like
this
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