QDB-17652 - Add support for Python 3.14#105
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igorniebylski merged 3 commits intomasterfrom Oct 16, 2025
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Pull Request Overview
This PR adds support for Python 3.14 by addressing a breaking change in multiprocessing behavior and updating version parsing logic. Python 3.14 changed the default process spawning method from "fork" to "forkserver" on POSIX systems, which breaks existing tests.
- Explicitly set multiprocessing to use "fork" method to maintain test compatibility
- Add Python 3.14 version parsing support in Docker configuration
Reviewed Changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| tests/test_firehose.py | Modified to explicitly use fork context for multiprocessing to maintain compatibility with Python 3.14 |
| docker/set-python-version.sh | Added version parsing case for Python 3.14 |
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| # way of starting process on Linux changed in python 3.14 from fork to forkserver: https://github.com/python/cpython/issues/84559 | ||
| # to keep this test working on newer python versions we specify the "fork" method explicitly |
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Corrected spelling of 'OS'es' to 'OSes' in the comment.
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Is this working on all agents ? |
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Yes, working on all agents. Ran composite for debug and release with only errors coming from flaky stats by node test. |
solatis
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Oct 15, 2025
igorniebylski
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In python 3.14 multiprocessing changed the way processes are spawned on POSIX OSes
For python < 3.14 multiprocessing used fork
For python >= 3.14 multiprocessing uses forkserver
more info python/cpython#84559
with forkserver the child process does not inherit the parent's resources
this change breaks the test because the child process cannot access the iterator
i set usage of fork explicitly to keep the test working
Build: http://teamcity.cicd.intra.quasar.ai:8111/buildConfiguration/Api_Python_Composite/1057870