Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1371#discussion_r15148144
--- Diff: python/pyspark/rdd.py ---
@@ -48,6 +48,35 @@
__all__ = ["RDD"]
+# TODO: for Python 3.3+, PYTHONHASHSEED should be reset to disable
randomized
+# hash for string
+def portable_hash(x):
+ """
+ This function returns consistant hash code for builtin types,
especially
+ for None and tuple with None.
+
+ The algrithm is similar to that one used by CPython 2.7
--- End diff --
Also explain what "consistent hash code means", this comment doesn't say
anything about the hash code of None being different across machines by default
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