Github user 10110346 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20576#discussion_r171452995
--- Diff:
core/src/test/scala/org/apache/spark/shuffle/sort/SortShuffleManagerSuite.scala
---
@@ -85,6 +85,14 @@ class SortShuffleManagerSuite extends SparkFunSuite with
Matchers {
mapSideCombine = false
)))
+ // We support serialized shuffle if we do not need to do map-side
aggregation
+ assert(canUseSerializedShuffle(shuffleDep(
+ partitioner = new HashPartitioner(2),
+ serializer = kryo,
+ keyOrdering = None,
+ aggregator = Some(mock(classOf[Aggregator[Any, Any, Any]])),
+ mapSideCombine = false
--- End diff --
You can see this code: `def groupByKey(partitioner: Partitioner): RDD[(K,
Iterable[V])]`
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