Github user steveloughran commented on a diff in the pull request: https://github.com/apache/spark/pull/9297#discussion_r44556620 --- Diff: core/src/main/scala/org/apache/spark/util/JsonProtocol.scala --- @@ -96,6 +114,7 @@ private[spark] object JsonProtocol { executorMetricsUpdateToJson(metricsUpdate) case blockUpdated: SparkListenerBlockUpdated => throw new MatchError(blockUpdated) // TODO(ekl) implement this + case _ => parse(write(event)) --- End diff -- if some more generic handling of json marshalling is in there (nice), why is `SparkListenerBlockUpdated` being excluded? It should just be one of the types marshalled
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