Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3073#discussion_r19831278
--- Diff: core/src/main/scala/org/apache/spark/TaskEndReason.scala ---
@@ -88,10 +88,11 @@ case class FetchFailed(
case class ExceptionFailure(
className: String,
description: String,
- stackTrace: Array[StackTraceElement],
+ stackTrace: String,
--- End diff --
Yes, the semantics we provide is that the HistoryServer or the Master can
read event logs from previous Spark versions. We need to maintain backward
compatibility for all classes used in these events to provide that guarantee.
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