Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18487#discussion_r128667967
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -321,6 +321,17 @@ 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 per reduce task" +
+ " from a given host port. When a large number of blocks are being
requested from a given" +
+ " address in a single fetch or simultaneously, this could crash
the serving executor or" +
+ " Node Manager. This is especially useful to reduce the load on
the Node Manager when" +
--- End diff --
I think Node Manager is for YARN only? Shuffle service is more general
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