[
https://issues.apache.org/jira/browse/SPARK-19019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Davies Liu resolved SPARK-19019.
--------------------------------
Resolution: Fixed
Fix Version/s: 2.2.0
2.1.1
Issue resolved by pull request 16429
[https://github.com/apache/spark/pull/16429]
> PySpark does not work with Python 3.6.0
> ---------------------------------------
>
> Key: SPARK-19019
> URL: https://issues.apache.org/jira/browse/SPARK-19019
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Reporter: Hyukjin Kwon
> Priority: Critical
> Fix For: 2.1.1, 2.2.0
>
>
> Currently, PySpark does not work with Python 3.6.0.
> Running {{./bin/pyspark}} simply throws the error as below:
> {code}
> Traceback (most recent call last):
> File ".../spark/python/pyspark/shell.py", line 30, in <module>
> import pyspark
> File ".../spark/python/pyspark/__init__.py", line 46, in <module>
> from pyspark.context import SparkContext
> File ".../spark/python/pyspark/context.py", line 36, in <module>
> from pyspark.java_gateway import launch_gateway
> File ".../spark/python/pyspark/java_gateway.py", line 31, in <module>
> from py4j.java_gateway import java_import, JavaGateway, GatewayClient
> File "<frozen importlib._bootstrap>", line 961, in _find_and_load
> File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
> File "<frozen importlib._bootstrap>", line 646, in _load_unlocked
> File "<frozen importlib._bootstrap>", line 616, in _load_backward_compatible
> File ".../spark/python/lib/py4j-0.10.4-src.zip/py4j/java_gateway.py", line
> 18, in <module>
> File
> "/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/pydoc.py",
> line 62, in <module>
> import pkgutil
> File
> "/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/lib/python3.6/pkgutil.py",
> line 22, in <module>
> ModuleInfo = namedtuple('ModuleInfo', 'module_finder name ispkg')
> File ".../spark/python/pyspark/serializers.py", line 394, in namedtuple
> cls = _old_namedtuple(*args, **kwargs)
> TypeError: namedtuple() missing 3 required keyword-only arguments: 'verbose',
> 'rename', and 'module'
> {code}
> The problem is in
> https://github.com/apache/spark/blob/3c68944b229aaaeeaee3efcbae3e3be9a2914855/python/pyspark/serializers.py#L386-L394
> as the error says and the cause seems because the arguments of
> {{namedtuple}} are now completely keyword-only arguments from Python 3.6.0
> (See https://bugs.python.org/issue25628).
> We currently copy this function via {{types.FunctionType}} which does not set
> the default values of keyword-only arguments (meaning
> {{namedtuple.__kwdefaults__}}) and this seems causing internally missing
> values in the function (non-bound arguments).
> This ends up as below:
> {code}
> import types
> import collections
> def _copy_func(f):
> return types.FunctionType(f.__code__, f.__globals__, f.__name__,
> f.__defaults__, f.__closure__)
> _old_namedtuple = _copy_func(collections.namedtuple)
> _old_namedtuple(, "b")
> _old_namedtuple("a")
> {code}
> If we call as below:
> {code}
> >>> _old_namedtuple("a", "b")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: namedtuple() missing 3 required keyword-only arguments: 'verbose',
> 'rename', and 'module'
> {code}
> It throws an exception as above becuase {{__kwdefaults__}} for required
> keyword arguments seem unset in the copied function. So, if we give explicit
> value for these,
> {code}
> >>> _old_namedtuple("a", "b", verbose=False, rename=False, module=None)
> <class '__main__.a'>
> {code}
> It works fine.
> It seems now we should properly set these into the hijected one.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
