Huang Xingbo created FLINK-22517:
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Summary: Fix pickle compatibility problem in different Python
versions
Key: FLINK-22517
URL: https://issues.apache.org/jira/browse/FLINK-22517
Project: Flink
Issue Type: Bug
Components: API / Python
Affects Versions: 1.12.3, 1.13.0
Reporter: Huang Xingbo
Assignee: Huang Xingbo
Since release-1.12, PyFlink has supported Python3 8. Starting from Python 3.8,
the default protocol version used by pickle is
pickle5(https://www.python.org/dev/peps/pep-0574/), which will raising the
following exception if the client uses python 3.8 to compile program and the
cluster node uses python 3.7 or python 3.6 to run python udf:
{code:python}
ValueError: unsupported pickle protocol: 5
{code}
The workaround is to first let the python version used by the client be 3.6 or
3.7. For how to specify the client-side python execution environment, please
refer to the
doc(https://ci.apache.org/projects/flink/flink-docs-release-1.12/dev/python/python_config.html#python-client-executable).
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