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 --
    The current framework looks like the trackers can't share the collection of 
states or some same metrics. Isn't a likely happened use case? When two 
trackers needs the same metrics, we will need to collect it in two copies of 

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