Github user seyfe commented on a diff in the pull request: https://github.com/apache/spark/pull/15371#discussion_r82309886 --- Diff: core/src/main/scala/org/apache/spark/util/JsonProtocol.scala --- @@ -281,7 +281,7 @@ private[spark] object JsonProtocol { ("Finish Time" -> taskInfo.finishTime) ~ ("Failed" -> taskInfo.failed) ~ ("Killed" -> taskInfo.killed) ~ - ("Accumulables" -> JArray(taskInfo.accumulables.map(accumulableInfoToJson).toList)) + ("Accumulables" -> JArray(taskInfo.accumulables.toList.map(accumulableInfoToJson))) --- End diff -- This wasn't the root cause but it's something nice to have. If you prefer, I can revert this line.
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