Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18566#discussion_r126275228
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -323,9 +323,10 @@ package object config {
private[spark] val REDUCER_MAX_REQ_SIZE_SHUFFLE_TO_MEM =
ConfigBuilder("spark.reducer.maxReqSizeShuffleToMem")
- .internal()
.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.")
+ "above this threshold. This is to avoid a giant request takes too
much memory. Note that" +
+ " it's necessary to have the support of shuffle service(at least
Spark-2.2) when enable " +
--- End diff --
is it possible to implement this feature without shuffle service?
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