Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/12936#discussion_r62785888 --- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala --- @@ -112,7 +112,18 @@ abstract class AccumulatorV2[IN, OUT] extends Serializable { * Creates a new copy of this accumulator, which is zero value. i.e. call `isZero` on the copy * must return true. */ - def copyAndReset(): AccumulatorV2[IN, OUT] + def copyAndReset(): AccumulatorV2[IN, OUT] = copy().reset() + + /** + * Creates a new copy of this accumulator. + */ + def copy(): AccumulatorV2[IN, OUT] + + /** + * Resets this accumulator, which is zero value. i.e. call `isZero` must + * return true. + */ + def reset(): AccumulatorV2[IN, OUT] --- End diff -- I know this can save some line of code, but I prefer to define it as `def reset(): Unit`, which matches its semantic better.
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