Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10061#discussion_r63921076
--- Diff: core/src/main/scala/org/apache/spark/util/JsonProtocol.scala ---
@@ -96,6 +100,7 @@ private[spark] object JsonProtocol {
executorMetricsUpdateToJson(metricsUpdate)
case blockUpdated: SparkListenerBlockUpdated =>
throw new MatchError(blockUpdated) // TODO(ekl) implement this
+ case _ => parse(mapper.writeValueAsString(event))
--- End diff --
Yes I think this is a terrible idea. Actually back in the days when we
introduced magic serialization, I was against it.
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