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

    https://github.com/apache/spark/pull/3009#discussion_r20665136
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/jobs/UIData.scala ---
    @@ -40,9 +40,22 @@ private[jobs] object UIData {
     
       class JobUIData(
         var jobId: Int = -1,
    +    var startTime: Option[Long] = None,
    +    var endTime: Option[Long] = None,
         var stageIds: Seq[Int] = Seq.empty,
         var jobGroup: Option[String] = None,
    -    var status: JobExecutionStatus = JobExecutionStatus.UNKNOWN
    +    var status: JobExecutionStatus = JobExecutionStatus.UNKNOWN,
    +    /* Tasks */
    +    // `numTasks` is a potential underestimate of the true number of tasks 
that this job will run
    +    // see https://github.com/apache/spark/pull/3009 for an extensive 
discussion of this
    --- End diff --
    
    as in above, is it possible to provide a 1-line quick summary of why that 
is the case, and if the reader wants to dig deeper then they can follow the 
link?


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