Steven Normore created BEAM-2964:
------------------------------------
Summary: 2.1.0 with latest six (1.11.0) produces "metaclass
conflict: the metaclass of a derived class must be a (non-strict) subclass of
the metaclasses of all its bases"
Key: BEAM-2964
URL: https://issues.apache.org/jira/browse/BEAM-2964
Project: Beam
Issue Type: Bug
Components: sdk-py
Affects Versions: 2.1.0
Environment: Python 2.7 in a virtualenv on MacOS
Reporter: Steven Normore
Assignee: Ahmet Altay
{{$ virtualenv venv
[...]
$ source venv/bin/activate
[...]
$ pip install apache-beam[gcp]==2.1.0 six==1.11.0
[...]
$ python -c 'import apache_beam'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/__init__.py",
line 78, in <module>
from apache_beam import io
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/__init__.py",
line 21, in <module>
from apache_beam.io.avroio import *
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/avroio.py",
line 29, in <module>
from apache_beam.io import filebasedsource
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/filebasedsource.py",
line 33, in <module>
from apache_beam.io.filesystems import FileSystems
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/filesystems.py",
line 31, in <module>
from apache_beam.io.gcp.gcsfilesystem import GCSFileSystem
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/gcp/gcsfilesystem.py",
line 27, in <module>
from apache_beam.io.gcp import gcsio
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/gcp/gcsio.py",
line 36, in <module>
from apache_beam.utils import retry
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/utils/retry.py",
line 38, in <module>
from apitools.base.py.exceptions import HttpError
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/py/__init__.py",
line 21, in <module>
from apitools.base.py.base_api import *
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/py/base_api.py",
line 31, in <module>
from apitools.base.protorpclite import message_types
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/protorpclite/message_types.py",
line 25, in <module>
from apitools.base.protorpclite import messages
File
"/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/protorpclite/messages.py",
line 1165, in <module>
class Field(six.with_metaclass(_FieldMeta, object)):
TypeError: Error when calling the metaclass bases
metaclass conflict: the metaclass of a derived class must be a (non-strict)
subclass of the metaclasses of all its bases
(venv)
$ pip install six==1.10.0
[...]
$ python -c 'import apache_beam'
[success]
}}
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