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[SPARK-1468] Modify the partition function used by partitionBy. #371

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[SPARK-1468] Modify the partition function used by partitionBy. #371

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5 changes: 4 additions & 1 deletion python/pyspark/rdd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -913,7 +913,7 @@ def rightOuterJoin(self, other, numPartitions=None):
return python_right_outer_join(self, other, numPartitions)

# TODO: add option to control map-side combining
def partitionBy(self, numPartitions, partitionFunc=hash):
def partitionBy(self, numPartitions, partitionFunc=None):
"""
Return a copy of the RDD partitioned using the specified partitioner.

Expand All @@ -924,6 +924,9 @@ def partitionBy(self, numPartitions, partitionFunc=hash):
"""
if numPartitions is None:
numPartitions = self.ctx.defaultParallelism

if partitionFunc is None:
partitionFunc = lambda x: 0 if x is None else hash(x)
# Transferring O(n) objects to Java is too expensive. Instead, we'll
# form the hash buckets in Python, transferring O(numPartitions) objects
# to Java. Each object is a (splitNumber, [objects]) pair.
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