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Posted to commits@cassandra.apache.org by "Adam Holmberg (Jira)" <ji...@apache.org> on 2020/08/17 19:10:00 UTC
[jira] [Created] (CASSANDRA-16053) cqlsh COPY functions broken in
Python 3.8 on Mac
Adam Holmberg created CASSANDRA-16053:
-----------------------------------------
Summary: cqlsh COPY functions broken in Python 3.8 on Mac
Key: CASSANDRA-16053
URL: https://issues.apache.org/jira/browse/CASSANDRA-16053
Project: Cassandra
Issue Type: Bug
Components: Tool/cqlsh
Reporter: Adam Holmberg
Assignee: Adam Holmberg
{noformat}
aholmberg-rmbp16:cassandra adamholmberg$ pyenv shell
3.8.2
aholmberg-rmbp16:cassandra adamholmberg$ bin/cqlsh --debug
Using CQL driver: <module 'cassandra' from '/Users/adamholmberg/code/cassandra/bin/../lib/cassandra-driver-internal-only-3.23.0.post0-1a184b99.zip/cassandra-driver-3.23.0.post0-1a184b99/cassandra/__init__.py'>
Using connect timeout: 5 seconds
Using 'utf-8' encoding
Using ssl: False
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 4.0-beta2-SNAPSHOT | CQL spec 3.4.5 | Native protocol v4]
Use HELP for help.
cqlsh> copy test.testcopyto to 'asdf';
Detected 12 core(s)
Using 11 child processes
Starting copy of test.testcopyto with columns [a, b, c, d].
Traceback (most recent call last):
File "/Users/adamholmberg/code/cassandra/bin/cqlsh.py", line 937, in onecmd
self.handle_statement(st, statementtext)
File "/Users/adamholmberg/code/cassandra/bin/cqlsh.py", line 974, in handle_statement
return custom_handler(parsed)
File "/Users/adamholmberg/code/cassandra/bin/cqlsh.py", line 1563, in do_copy
task.run()
File "/Users/adamholmberg/code/cassandra/bin/../pylib/cqlshlib/copyutil.py", line 669, in run
self.start_processes()
File "/Users/adamholmberg/code/cassandra/bin/../pylib/cqlshlib/copyutil.py", line 471, in start_processes
process.start()
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/context.py", line 283, in _Popen
return Popen(process_obj)
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 32, in __init__
super().__init__(process_obj)
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/popen_fork.py", line 19, in __init__
self._launch(process_obj)
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 47, in _launch
reduction.dump(process_obj, fp)
File "/Users/adamholmberg/.pyenv/versions/3.8.2/lib/python3.8/multiprocessing/reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_thread.lock' object
cqlsh>
{noformat}
`multiprocessing` uses a different start method on Mac.
https://github.com/python/cpython/blob/db098bc1f05bd0773943e59f83489f05f28dedf8/Lib/multiprocessing/context.py#L313-L318
https://bugs.python.org/issue33725
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