Github user tgravescs commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14659#discussion_r79408637
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -2420,6 +2420,44 @@ private[spark] object Utils extends Logging {
       }
     }
     
    +private[spark] class CallerContext(
    +   appName: Option[String] = None,
    +   appID: Option[String] = None,
    +   appAttemptID: Option[String] = None,
    +   jobID: Option[Int] = None,
    +   stageID: Option[Int] = None,
    +   stageAttemptId: Option[Int] = None,
    +   taskId: Option[Long] = None,
    +   taskAttemptNumber: Option[Int] = None) extends Logging {
    +
    +   val AppName = if (appName.isDefined) s"_AppName_${appName.get}" else ""
    +   val AppID = if (appID.isDefined) s"_AppID_${appID.get}" else ""
    +   val AppAttemptID = if (appAttemptID.isDefined) s"_${appAttemptID.get}" 
else ""
    +   val JobID = if (jobID.isDefined) s"_JobID_${jobID.get}" else ""
    +   val StageID = if (stageID.isDefined) s"_StageID_${stageID.get}" else ""
    +   val StageAttemptId = if (stageAttemptId.isDefined) 
s"_${stageAttemptId.get}" else ""
    +   val TaskId = if (taskId.isDefined) s"_TaskId_${taskId.get}" else ""
    +   val TaskAttemptNumber = if (taskAttemptNumber.isDefined) 
s"_${taskAttemptNumber.get}" else ""
    +
    +   val context = "SPARK" + AppName + AppID + AppAttemptID +
    +     JobID + StageID + StageAttemptId + TaskId + TaskAttemptNumber
    +
    +  def set(): Boolean = {
    +    var succeed = false
    +    try {
    +      val callerContext = 
Utils.classForName("org.apache.hadoop.ipc.CallerContext")
    --- End diff --
    
    Actually perhaps add a description to this entire class that explain what 
this is, what it applies to and when it was added.


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