Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/11544#discussion_r55874631
  
    --- Diff: 
core/src/main/scala/org/apache/spark/ui/jobs/JobProgressListener.scala ---
    @@ -374,28 +374,30 @@ class JobProgressListener(conf: SparkConf) extends 
SparkListener with Logging {
           execSummary.taskTime += info.duration
           stageData.numActiveTasks -= 1
     
    -      val (errorMessage, metrics): (Option[String], Option[TaskMetrics]) =
    +      val (errorMessage, metrics): (Option[String], Seq[AccumulableInfo]) =
             taskEnd.reason match {
               case org.apache.spark.Success =>
                 stageData.completedIndices.add(info.index)
                 stageData.numCompleteTasks += 1
    -            (None, Option(taskEnd.taskMetrics))
    -          case e: ExceptionFailure =>  // Handle ExceptionFailure because 
we might have metrics
    +            (None, taskEnd.taskMetrics.accumulatorUpdates())
    +          case e: ExceptionFailure => // Handle ExceptionFailure because 
we might have metrics
                 stageData.numFailedTasks += 1
    -            (Some(e.toErrorString), e.metrics)
    -          case e: TaskFailedReason =>  // All other failure cases
    +            (Some(e.toErrorString), e.accumUpdates)
    +          case e: TaskFailedReason => // All other failure cases
                 stageData.numFailedTasks += 1
    -            (Some(e.toErrorString), None)
    +            (Some(e.toErrorString), Seq.empty[AccumulableInfo])
             }
     
    -      metrics.foreach { m =>
    +      val taskMetrics: Option[TaskMetrics] = if (metrics.nonEmpty) 
Option(TaskMetrics.
    +        fromAccumulatorUpdates(metrics)) else None
    --- End diff --
    
    Why not just?
    `val taskMetrics = TaskMetrics.fromAccumulatorUpdates(accums)`
    Are you worried that this may fail? Then you can just use a `Try`.


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