Github user viirya commented on a diff in the pull request:
    --- Diff: 
    @@ -269,50 +278,57 @@ object FileFormatWriter extends Logging {
    +   * For every registered [[WriteJobStatsTracker]], call `processStats()` 
on it, passing it
    +   * the corresponding [[WriteTaskStats]] from all executors.
    +   */
    +  private def processStats(
    +      statsTrackers: Seq[WriteJobStatsTracker],
    +      statsPerTask: Seq[Seq[WriteTaskStats]])
    --- End diff --
    Because some metrics might be costly, I was just thinking of a case that 
more than one tracker need to use few overlapping metrics. Instead of having 
measuring the metrics in two different collections of states, measuring once 
and having just one copy of the metrics seems more reasonable. For now, this 
may lead to overdesign, just curious how we can deal with it easily. We can 
consider that once we hit that.

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