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https://issues.apache.org/jira/browse/SPARK-4897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen updated SPARK-4897:
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Target Version/s: 1.4.0 (was: 1.3.0)
> 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
> 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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