Github user ilganeli commented on a diff in the pull request:
https://github.com/apache/spark/pull/4696#discussion_r25107441
--- Diff: docs/programming-guide.md ---
@@ -728,6 +728,63 @@ def doStuff(self, rdd):
</div>
+### Understanding closures
+One of the harder things about Spark is understanding the scope and life
cycle of variables and methods when executing code across a cluster. A frequent
source of confusion is shown below - where we perform a common task
(incrementing a counter from inside of a for-loop). In our example, we look at
`foreach()` but this same scenario will apply to any other RDD operations that
modify variables outside of their scope.
--- End diff --
I like this suggestion, I much prefer this wording.
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