Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20790#discussion_r173621260
--- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
@@ -290,7 +290,8 @@ class LongAccumulator extends AccumulatorV2[jl.Long,
GitHub user smallory opened a pull request:
https://github.com/apache/spark/pull/20790
AccumulatorV2 subclass isZero scaladoc fix
Added/corrected scaladoc for isZero on the DoubleAccumulator,
CollectionAccumulator, and LongAccumulator subclasses of AccumulatorV2,
particularly
