xuanyuanking commented on a change in pull request #28941:
URL: https://github.com/apache/spark/pull/28941#discussion_r448192444



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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:
       Make sense. It deserves a follow-up, let me submit one soon.




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