Joni Kähärä <joni.kah...@async.fi> added the comment:
Perhaps I wasn't clear that this considered ProcessPoolExecutor documentation,
not ThreadPoolExecutor. Taking the example from documentation and adding an
initializer like this:
import concurrent.futures
import math
PRIMES = [
112272535095293,
112582705942171,
112272535095293,
115280095190773,
115797848077099,
1099726899285419]
def is_prime(n):
if n % 2 == 0:
return False
sqrt_n = int(math.floor(math.sqrt(n)))
for i in range(3, sqrt_n + 1, 2):
if n % i == 0:
return False
return True
def init():
raise Exception()
def main():
with concurrent.futures.ProcessPoolExecutor(initializer=init) as executor:
for number, prime in zip(PRIMES, executor.map(is_prime, PRIMES)):
print('%d is prime: %s' % (number, prime))
if __name__ == '__main__':
main()
...yields the following:
Exception in initializer:
Traceback (most recent call last):
File "/Users/developer/cpython/Lib/concurrent/futures/process.py", line 219,
in _process_worker
initializer(*initargs)
File "/tmp/bpo34786.py", line 25, in init
raise Exception()
Exception
Exception in initializer:
Traceback (most recent call last):
File "/Users/developer/cpython/Lib/concurrent/futures/process.py", line 219,
in _process_worker
initializer(*initargs)
File "/tmp/bpo34786.py", line 25, in init
raise Exception()
Exception
Exception in initializer:
Traceback (most recent call last):
File "/Users/developer/cpython/Lib/concurrent/futures/process.py", line 219,
in _process_worker
initializer(*initargs)
File "/tmp/bpo34786.py", line 25, in init
raise Exception()
Exception
Exception in initializer:
Traceback (most recent call last):
File "/Users/developer/cpython/Lib/concurrent/futures/process.py", line 219,
in _process_worker
initializer(*initargs)
File "/tmp/bpo34786.py", line 25, in init
raise Exception()
Exception
Traceback (most recent call last):
File "/tmp/bpo34786.py", line 33, in <module>
main()
File "/tmp/bpo34786.py", line 29, in main
for number, prime in zip(PRIMES, executor.map(is_prime, PRIMES)):
File "/Users/developer/cpython/Lib/concurrent/futures/process.py", line 476,
in _chain_from_iterable_of_lists
for element in iterable:
File "/Users/developer/cpython/Lib/concurrent/futures/_base.py", line 594, in
result_iterator
yield fs.pop().result()
File "/Users/developer/cpython/Lib/concurrent/futures/_base.py", line 436, in
result
return self.__get_result()
File "/Users/developer/cpython/Lib/concurrent/futures/_base.py", line 388, in
__get_result
raise self._exception
concurrent.futures.process.BrokenProcessPool: A process in the process pool was
terminated abruptly while the future was running or pending.
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34786>
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