Github user dhruve commented on a diff in the pull request:
https://github.com/apache/spark/pull/18487#discussion_r125942326
--- 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 " +
+ " blocks are being requested from a given node in a single fetch
or simultaneously, this " +
+ " could crash the Node Manager under increased load. You can
mitigate this issue by " +
+ " setting it to a lower value.")
+ .intConf
+ .createWithDefault(Int.MaxValue)
--- End diff --
okay.
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