Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21758#discussion_r203619611
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskDescription.scala ---
@@ -50,6 +50,7 @@ private[spark] class TaskDescription(
val executorId: String,
val name: String,
val index: Int, // Index within this task's TaskSet
+ val partitionId: Int,
--- End diff --
I'm wondering if we need this. For barrier stage we always retry the entire
stage, so `index` must be equal to partitionId.
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