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

    https://github.com/apache/spark/pull/11105#discussion_r84380686
  
    --- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
    @@ -136,15 +179,76 @@ abstract class AccumulatorV2[IN, OUT] extends 
Serializable {
       def reset(): Unit
     
       /**
    +   * Takes the inputs and accumulates. e.g. it can be a simple `+=` for 
counter accumulator.
    +   * Developers should extend addImpl to customize the adding 
functionality.
    +   */
    +  final def add(v: IN): Unit = {
    +    if (metadata != null && metadata.dataProperty) {
    +      dataPropertyAdd(v)
    +    } else {
    +      addImpl(v)
    +    }
    +  }
    +
    +  private def dataPropertyAdd(v: IN): Unit = {
    +    // Add first for localValue & AccumulatorInfo
    --- End diff --
    
    sorry I wasn't clear -- I meant why is "first" important.  But i guess 
first isn't actually important, you're saying that *both* are needed.  Can you 
update the comment to reflect that?


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