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

    https://github.com/apache/spark/pull/11544#discussion_r55438396
  
    --- Diff: 
core/src/main/scala/org/apache/spark/ui/jobs/JobProgressListener.scala ---
    @@ -374,28 +374,29 @@ 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 =>
    +      if (metrics.nonEmpty) {
             val oldMetrics = 
stageData.taskData.get(info.taskId).flatMap(_.taskMetrics)
    -        updateAggregateMetrics(stageData, info.executorId, m, oldMetrics)
    +        updateAggregateMetrics(stageData, info.executorId,
    +          TaskMetrics.fromAccumulatorUpdates(metrics), oldMetrics)
           }
    -
           val taskData = stageData.taskData.getOrElseUpdate(info.taskId, new 
TaskUIData(info))
           taskData.taskInfo = info
    -      taskData.taskMetrics = metrics
    +      taskData.taskMetrics = if (metrics.nonEmpty) Option(TaskMetrics.
    +        fromAccumulatorUpdates(metrics)) else None
    --- End diff --
    
    I was thinking of something like this:
    ```scala
    val (errorMessage, metrics): (Option[String], Seq[AccumulableInfo]) = //as 
before
    
    val taskMetrics: Option[TaskMetrics] = if (metrics.nonEmpty) 
TaskMetrics.fromAccumulatorUpdates(metrics) else None
    
    taskMetrics.foreach{m =>
      val oldMetrics = //as before
      updateAggregateMetrics(stageData, info.executorId, m, oldMetrics)
    }
    
    taskData.taskMetrics = taskMetrics
    ```
    That way you avoid calling TaskMetrics.fromAccumulatorUpdates twice. Maybe 
its a nitpick, depending on the complexity of creating task metrics from 
accumulators. 


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