Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/11105#discussion_r55434621
--- Diff: core/src/main/scala/org/apache/spark/Accumulable.scala ---
@@ -146,6 +198,32 @@ class Accumulable[R, T] private (
def merge(term: R) { value_ = param.addInPlace(value_, term)}
/**
+ * Merge in pending updates for ac consistent accumulators or merge
accumulated values for
+ * regular accumulators.
--- End diff --
I'd add a comment that this is only gets called on the driver when merging
Task results together.
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