Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/705#discussion_r13169034
--- Diff: python/pyspark/rdd.py ---
@@ -1131,7 +1131,18 @@ def _mergeCombiners(iterator):
combiners[k] = mergeCombiners(combiners[k], v)
return combiners.iteritems()
return shuffled.mapPartitions(_mergeCombiners)
-
+
+ def aggregateByKey(self, zeroValue, seqFunc, combFunc,
numPartitions=None):
+ """
+ Aggregate the values of each key, using given combine functions
and a neutral "zero value".
+ This function can return a different result type, U, than the type
of the values in this RDD,
+ V. Thus, we need one operation for merging a T into a U and one
operation for merging two U's,
--- End diff --
My bad. Uploaded a patch that fixes this.
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