[jira] [Commented] (SPARK-4897) Python 3 support

["Matthew Cornell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14264643#comment-14264643 ] 

Matthew Cornell commented on SPARK-4897:
----------------------------------------

Please!!

> 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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