cloud-fan commented on a change in pull request #34474:
URL: https://github.com/apache/spark/pull/34474#discussion_r742690800
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File path: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala
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@@ -157,6 +157,9 @@ abstract class AccumulatorV2[IN, OUT] extends Serializable {
*/
def value: OUT
+ // We assume that serialization of AccumulatorV2 runs on executor is not
necessary.
Review comment:
```
// Serialize the buffer of this accumulator before sending back this
accumulator to the driver.
// By default this method does nothing.
```
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