Github user e-dorigatti commented on a diff in the pull request:
https://github.com/apache/spark/pull/21383#discussion_r189823961
--- Diff: python/pyspark/shuffle.py ---
@@ -67,6 +67,19 @@ def get_used_memory():
return 0
+def safe_iter(f):
+ """ wraps f to make it safe (= does not lead to data loss) to use
inside a for loop
--- End diff --
Yes, indeed that's how I stumbled upon this bug in the first place
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