Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/21927#discussion_r206592066
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -451,6 +465,32 @@ class DAGScheduler(
parents
}
+ /**
+ * Traverse all the parent RDDs within the same stage with the given
RDD, check whether all the
--- End diff --
It also checks the RDD itself. "Traverses the given RDD and its ancestors
within the same stage and checks whether all of the RDDs satisfy a given
predicate."
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