dongjoon-hyun commented on a change in pull request #28941:
URL: https://github.com/apache/spark/pull/28941#discussion_r446702623
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File path: core/src/main/scala/org/apache/spark/util/JsonProtocol.scala
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@@ -1078,7 +1078,10 @@ private[spark] object JsonProtocol {
val blockManagerAddress = blockManagerIdFromJson(json \ "Block Manager
Address")
val shuffleId = (json \ "Shuffle ID").extract[Int]
val mapId = (json \ "Map ID").extract[Long]
- val mapIndex = (json \ "Map Index").extract[Int]
+ val mapIndex = (json \ "Map Index") match {
+ case JNothing => 0
Review comment:
So, this is only Spark History Server regression? Is there any
side-effect on Spark 3.0.0?
> When Spark history server read event log produced
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