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

    https://github.com/apache/spark/pull/4020#discussion_r23060808
  
    --- Diff: core/src/main/scala/org/apache/spark/executor/Executor.scala ---
    @@ -257,8 +257,8 @@ private[spark] class Executor(
               val serviceTime = System.currentTimeMillis() - taskStart
               val metrics = attemptedTask.flatMap(t => t.metrics)
               for (m <- metrics) {
    -            m.executorRunTime = serviceTime
    -            m.jvmGCTime = gcTime - startGCTime
    +            m.incExecutorRunTime(serviceTime)
    --- End diff --
    
    The purpose of this original patch was to just lock down the visibility, so 
I think it's fine to have -package-private setters in cases where we don't 
simply increment/decrement. We could also just only have setters (and not 
inc/dec). Basically as long as they are private, I don't mind. Maybe there is 
some value to restricting certain ones to inc/dec to provide more safety.


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