Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12472#discussion_r60175871
--- Diff: core/src/main/scala/org/apache/spark/scheduler/StageInfo.scala ---
@@ -36,7 +36,7 @@ class StageInfo(
val rddInfos: Seq[RDDInfo],
val parentIds: Seq[Int],
val details: String,
- val internalAccumulators: Seq[Accumulator[_]] = Seq.empty,
+ val taskMetrics: TaskMetrics = null,
--- End diff --
if that's the case, it might be better to always create a taskmetric rather
than leave it at null
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