Github user wzhfy commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
    @@ -193,8 +219,27 @@ private[spark] object HighlyCompressedMapStatus {
         } else {
    +    val threshold1 = Option(SparkEnv.get)
    +      .map(_.conf.get(config.SHUFFLE_ACCURATE_BLOCK_THRESHOLD))
    +      .getOrElse(config.SHUFFLE_ACCURATE_BLOCK_THRESHOLD.defaultValue.get)
    +    val threshold2 = avgSize * Option(SparkEnv.get)
    +    val threshold = math.max(threshold1, threshold2)
    --- End diff --
    Just for curiosity: is there any reason we compute threshold in this way?

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