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From "Josh Rosen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-4897) Python 3 support
Date Thu, 16 Apr 2015 23:21:58 GMT

     [ https://issues.apache.org/jira/browse/SPARK-4897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh Rosen resolved SPARK-4897.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

Issue resolved by pull request 5173
[https://github.com/apache/spark/pull/5173]

> 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
>            Assignee: Davies Liu
>            Priority: Blocker
>             Fix For: 1.4.0
>
>
> 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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