cloud-fan commented on a change in pull request #26624:
URL: https://github.com/apache/spark/pull/26624#discussion_r417993026



##########
File path: core/src/main/scala/org/apache/spark/executor/Executor.scala
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@@ -674,6 +677,18 @@ private[spark] class Executor(
     }
   }
 
+  private def setMDCForTask(taskDescription: TaskDescription): Unit = {
+    val properties = taskDescription.properties
+
+    org.slf4j.MDC.put("appId", properties.getProperty("spark.app.id"))

Review comment:
       
https://github.com/apache/spark/blob/559fe098f666065f5411ec373dc466b260f6f87d/core/src/main/scala/org/apache/spark/scheduler/TaskDescription.scala#L172
   
   This is decoding. Do you know where do we set app name and id to 
`TaskDescriptoin` before we encode it?




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