Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21758#discussion_r205249547
--- Diff: core/src/main/scala/org/apache/spark/rdd/MapPartitionsRDD.scala
---
@@ -27,7 +27,8 @@ import org.apache.spark.{Partition, TaskContext}
private[spark] class MapPartitionsRDD[U: ClassTag, T: ClassTag](
var prev: RDD[T],
f: (TaskContext, Int, Iterator[T]) => Iterator[U], // (TaskContext,
partition index, iterator)
- preservesPartitioning: Boolean = false)
+ preservesPartitioning: Boolean = false,
+ isFromBarrier: Boolean = false)
--- End diff --
we should explain what this flag does in classdoc
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