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https://issues.apache.org/jira/browse/THRIFT-5454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yiyang Zhou updated THRIFT-5454:
--------------------------------
External issue URL: https://github.com/apache/thrift/pull/2438
> Python TProcessPoolServer does not spawn expected number of worker processes
> ----------------------------------------------------------------------------
>
> Key: THRIFT-5454
> URL: https://issues.apache.org/jira/browse/THRIFT-5454
> Project: Thrift
> Issue Type: Bug
> Components: Python - Library
> Reporter: Yiyang Zhou
> Priority: Major
> Labels: Python, TProcessPoolServer
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> When using Python TProcessPoolServer with more than 1 workers, only one
> worker process will be successfully spawned and all the other processes will
> reach a pickling error and exit. As a result, with the default settings, only
> one worker process is processing requests, whereas 10 workers are expected.
> ```bash
> Traceback (most recent call last):
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/thrift-0.16.0-py3.9-macosx-10.9-x86_64.egg/thrift/server/TProcessPoolServer.py",
> line 106, in serve
> w.start()
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/process.py",
> line 121, in start
> self._popen = self._Popen(self)
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py",
> line 224, in _Popen
> return _default_context.get_context().Process._Popen(process_obj)
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py",
> line 284, in _Popen
> return Popen(process_obj)
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py",
> line 32, in __init__
> super().__init__(process_obj)
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_fork.py",
> line 19, in __init__
> self._launch(process_obj)
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py",
> line 47, in _launch
> reduction.dump(process_obj, fp)
> File
> "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/reduction.py",
> line 60, in dump
> ForkingPickler(file, protocol).dump(obj)
> TypeError: cannot pickle 'weakref' object
> ```
>
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