Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5124#discussion_r26961357
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -805,7 +806,7 @@ class DAGScheduler(
}
val properties = if (jobIdToActiveJob.contains(jobId)) {
- jobIdToActiveJob(stage.jobId).properties
+ jobIdToActiveJob(stage.jobId).properties.orNull
--- End diff --
I don't know if there's a good reason for this, but I don't think we can
change it at this point without breaking binary compatibility. We could use
annotations / comments to make those fields' nullability more apparent, though.
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