Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/7021#discussion_r33971537
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDDCheckpointData.scala
---
@@ -44,6 +46,26 @@ private[spark] class RDDCheckpointData[T:
ClassTag](@transient rdd: RDD[T])
import CheckpointState._
+ // Because SparkContext is transient in RDD, so we can't get the id and
checkpointDir later.
+ // So keep a copy of the id and checkpointDir.
--- End diff --
Not sure if I understand this comment. How did it work before then? Even
before this patch `doCheckpoint` directly calls `rdd.id`
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