Github user dhruve commented on a diff in the pull request:
https://github.com/apache/spark/pull/18487#discussion_r125944449
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -321,6 +321,16 @@ package object config {
.intConf
.createWithDefault(3)
+ private[spark] val REDUCER_MAX_BLOCKS_IN_FLIGHT_PER_ADDRESS =
+ ConfigBuilder("spark.reducer.maxBlocksInFlightPerAddress")
+ .doc("This configuration limits the number of remote blocks being
fetched from a given " +
+ " host port at any given point. When external shuffle is enabled
and a large number of " +
--- End diff --
In this case it would take down either the NM or the executor serving the
map output tasks based on the shuffle mode. We emphasize the external shuffle
case as crashing the NM is more severe than loosing an executor. I am open to
re-wording it so that it is easier to understand.
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