Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21165#discussion_r187905421
--- Diff: docs/rdd-programming-guide.md ---
@@ -1548,6 +1548,9 @@ data.map(g)
</div>
+In new version of Spark(> 2.3), the semantic of Accumulator has been
changed a bit: it now includes updates from
--- End diff --
it's not needed now
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