Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r118184231
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -287,4 +287,10 @@ package object config {
.bytesConf(ByteUnit.BYTE)
.createWithDefault(100 * 1024 * 1024)
+ private[spark] val REDUCER_MAX_REQ_SIZE_SHUFFLE_TO_MEM =
+ ConfigBuilder("spark.reducer.maxReqSizeShuffleToMem")
+ .doc("The blocks of a shuffle request will be fetched to disk when
size of the request is " +
+ "above this threshold. This is to avoid a giant request takes too
much memory.")
+ .longConf
+ .createWithDefault(200 * 1024 * 1024)
--- End diff --
shall we use `bytesConf(ByteUnit.MiB)` here?
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