Josh Rosen created SPARK-4897:
---------------------------------
Summary: Python 3 support
Key: SPARK-4897
URL: https://issues.apache.org/jira/browse/SPARK-4897
Project: Spark
Issue Type: Improvement
Components: PySpark
Reporter: Josh Rosen
Priority: Minor
It would be nice to have Python 3 support in PySpark, provided that we can do
it in a way that maintains backwards-compatibility with Python 2.6.
I started looking into porting this; my WIP work can be found at
https://github.com/JoshRosen/spark/compare/python3?expand=1
I was able to use the
[futurize|http://python-future.org/futurize.html#forwards-conversion-stage1]
tool to handle the basic conversion of things like {{print}} statements, etc.
and had to manually fix up a few imports for packages that moved / were
renamed, but the major blocker that I hit was {{cloudpickle}}:
{code}
[joshrosen python (python3)]$ PYSPARK_PYTHON=python3 ../bin/pyspark
Python 3.4.2 (default, Oct 19 2014, 17:52:17)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.51)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
Traceback (most recent call last):
File "/Users/joshrosen/Documents/Spark/python/pyspark/shell.py", line 28, in
<module>
import pyspark
File "/Users/joshrosen/Documents/spark/python/pyspark/__init__.py", line 41,
in <module>
from pyspark.context import SparkContext
File "/Users/joshrosen/Documents/spark/python/pyspark/context.py", line 26,
in <module>
from pyspark import accumulators
File "/Users/joshrosen/Documents/spark/python/pyspark/accumulators.py", line
97, in <module>
from pyspark.cloudpickle import CloudPickler
File "/Users/joshrosen/Documents/spark/python/pyspark/cloudpickle.py", line
120, in <module>
class CloudPickler(pickle.Pickler):
File "/Users/joshrosen/Documents/spark/python/pyspark/cloudpickle.py", line
122, in CloudPickler
dispatch = pickle.Pickler.dispatch.copy()
AttributeError: type object '_pickle.Pickler' has no attribute 'dispatch'
{code}
This code looks like it will be hard difficult to port to Python 3, so this
might be a good reason to switch to [Dill|https://github.com/uqfoundation/dill]
for Python serialization.
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