Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4145#discussion_r27852064
--- Diff: core/src/main/scala/org/apache/spark/rdd/CoGroupedRDD.scala ---
@@ -29,15 +29,16 @@ import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.util.collection.{ExternalAppendOnlyMap,
AppendOnlyMap, CompactBuffer}
import org.apache.spark.util.Utils
import org.apache.spark.serializer.Serializer
-import org.apache.spark.shuffle.ShuffleHandle
-
-private[spark] sealed trait CoGroupSplitDep extends Serializable
+/** The references to rdd and splitIndex are transient because redundant
information is stored
+ * in the CoGroupedRDD object. Because CoGroupedRDD is serialized
separately from
+ * CoGrpupPartition, if rdd and splitIndex aren't transient, they'll be
included twice in the
--- End diff --
nit pick CoGroupPartition
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