Github user carsonwang commented on a diff in the pull request: https://github.com/apache/spark/pull/9297#discussion_r44614968 --- 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 -- I tried using the `JsonTypeInfo` annotation and it worked. The difference is that it need write the full class name now. The event will look like ``` "Event":"org.apache.spark.sql.execution.ui.SparkListenerSQLExecutionStart" ``` When deserializing the data, we use reflection to find the class so that the class list is not needed.
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