Mark Ao <[email protected]> added the comment:
I'm experiencing the same issue on Python 3.10.0 when I execute the code that
uses concurrent.futures.ProcessPoolExecutor.
========
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/local/lib/python3.10/threading.py", line 1009, in _bootstrap_inner
self.run()
File "/usr/local/lib/python3.10/concurrent/futures/process.py", line 317, in
run
result_item, is_broken, cause = self.wait_result_broken_or_wakeup()
File "/usr/local/lib/python3.10/concurrent/futures/process.py", line 376, in
wait_result_broken_or_wakeup
worker_sentinels = [p.sentinel for p in self.processes.values()]
File "/usr/local/lib/python3.10/concurrent/futures/process.py", line 376, in
<listcomp>
PROCESSING DATAFRAME: AKAM
worker_sentinels = [p.sentinel for p in self.processes.values()]
RuntimeError: dictionary changed size during iteration
========
I also tried to troubleshoot to find out the part that causes this exception,
but the most difficult part is: it does not happen every time I execute my code
that uses concurrent.futures.ProcessPoolExecutor. (Really like what Jakub
mentioend earlier, it is like a coincidence.)
At the same time, I am also testing if the same thing happens on other versions
like Python 3.8.8 (on Rocky Linux 8.5), but we would appreciate it if someone
can tell if this is a bug or not? Or even anything we should improve on my own
code? (if needed I can share the sample code, but honestly I do not think this
is something wrong with my code, since as I mentioned: the exception is not
happening every time I execute my code, so I suspect this might be a bug of
Python 3.10.0)
(Since Jakub already reported it happens on Python 3.9, so I am not testing on
3.9)
I would appreciate it if there is any update or info that can be shared.
Thank you!
----------
nosy: +markao
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<https://bugs.python.org/issue43498>
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