celery/billiard

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Multiprocessing Pool Extensions

Is celery/billiard beginner-friendly?

We have not seen enough recent pull requests from outside contributors to celery/billiard to say how often they are merged. No beginner-friendly issue is open right now; the list below has the other issues we hold for it.

Stars: 436
Forks: 273
Open beginner issues: 0
Indexed issues: 83
Avg merge: 4d 19h
Merged PRs (30d): 5

Dominant language: Python
License: No license data
Last GitHub push: Nov 2, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

How to contribute to celery/billiard

There is no contributing guide, so start from the README and a few recently merged pull requests to see how changes are proposed.
Follow the repository to hear when a new beginner-friendly issue opens, or look through the other issues below.

Beginner friendly Everything

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Issues somebody may already be working on are listed last. List everything by date

How to cleanly end processes in a Pool?
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#419 · Opened Dec 27, 2024
Could you please properly document the most important class of this package - Pool
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

celery/billiard#418 · Opened Dec 10, 2024
return in finally can swallow exceptions
May be free again @auvipy claimed this 602 days ago, and no pull request is open. Open
- Is something wrong?
celery/billiard#414 · 6 comments · 3 reactions · 1 assignee · Opened Oct 22, 2024
Handling numpy
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#413 · 1 comment · Opened Oct 18, 2024
Timeout arguments not working for everything except apply and apply_async
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 35/100

celery/billiard#412 · Opened Sep 24, 2024
WorkerLostError Handling
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#408 · Opened Aug 8, 2024
Long hangs when `os.sysconf('SC_OPEN_MAX')` is large
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 45/100

celery/billiard#399 · 4 reactions · Opened Jan 12, 2024
Task randomly get stuck (between parent and child)
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 30/100

celery/billiard#389 · 1 reaction · Opened Jul 10, 2023
Trouble with calling process
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 25/100

celery/billiard#388 · 1 reaction · Opened Apr 14, 2023
Worker exited prematurely: signal 9 (SIGKILL) Job: 10.
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#380 · 5 reactions · Opened Nov 8, 2022
dynamic pool size with gnumake jobclient / jobserver
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

celery/billiard#369 · Opened Jun 28, 2022
4.0.0: sphinx warnings (mainly `reference target not found`)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 30/100

celery/billiard#366 · 2 comments · Opened Apr 24, 2022
Run integration test of GA CI
May be free again @auvipy claimed this 1665 days ago, and no pull request is open. Open
- Is something wrong?
celery/billiard#363 · 1 assignee · Opened Apr 23, 2022
How to solve the race condition problem in Pool multiprocessing
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#357 · Opened Mar 1, 2022
TypeError: no default __reduce__ due to non-trivial __cinit__
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#356 · Opened Jan 19, 2022
Worker crashed with invalid file descriptor error when use with celery and gevent
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 32/100

celery/billiard#355 · 1 comment · 1 reaction · Opened Jan 6, 2022
billiard.exceptions.WorkerLostError: Worker exited prematurely: exitcode 1
Open
- Is something wrong?
Issue Type: Bug Report

Difficulty 4/5 3-5 days Newbie friendliness 30/100

celery/billiard#370 · 3 comments · Opened Oct 14, 2021
billiard.Pool slower than multiprocessing.Pool
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#336 · 3 comments · 4 reactions · Opened Aug 23, 2021
3.6.4.0 on python3.9: SemLock __exit__ throws '[WinError 6] The handle is invalid'
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#335 · Opened Jun 16, 2021
Billiard is leaving pipes open
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#329 · 4 comments · Opened Jan 26, 2021
v3.6.3.0 PermissionError: [WinError 5] Access is denied
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 20/100

celery/billiard#328 · 1 comment · 1 reaction · Opened Jan 25, 2021
Worker Process
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 10/100

celery/billiard#326 · Opened Dec 15, 2020
IMapIterator stuck?
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 25/100

celery/billiard#324 · Opened Dec 14, 2020
AutoScale casusing WorkerLostError
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#323 · 1 reaction · Opened Nov 26, 2020
try/except not working on WorkerLostError and signal 11
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#322 · 2 reactions · Opened Oct 14, 2020
Any task, even trivial, takes a lot of time using billiard
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 35/100

celery/billiard#321 · 1 comment · 2 reactions · Opened Sep 30, 2020
billiard.exceptions.WorkerLostError: Worker exited prematurely: signal 9 (SIGKILL) with billiard pool
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#319 · 7 comments · 2 reactions · Opened Sep 4, 2020
pickle _thread.lock objects error again
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#313 · 1 comment · 1 reaction · Opened Apr 27, 2020
Changelog does not reflect the changes in 3.6.2
May be free again @auvipy claimed this 2449 days ago, and no pull request is open. Open
- Is something wrong?
celery/billiard#304 · 2 comments · 1 reaction · 1 assignee · Opened Feb 4, 2020
Readthedocs doesn't mention billiard
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 35/100

celery/billiard#301 · 6 comments · 3 reactions · Opened Jan 26, 2020
Additional logging in mark_as_worker_lost
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 45/100

celery/billiard#296 · 3 reactions · Opened Dec 10, 2019
SemLock leak: fill /dev/shm when creating and deleting multiple Pools
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 28/100

celery/billiard#293 · 3 comments · 1 reaction · Opened Nov 26, 2019
Billiard 6 based on trio
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 15/100

celery/billiard#291 · 2 comments · Opened Oct 24, 2019
celery worker logging multiprocess safe?
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 20/100

celery/billiard#290 · Opened Oct 24, 2019
Regression in 3.6.1 - Permission Denied
May be free again @AvnerCohen claimed this 2353 days ago, and no pull request is open. Open
- Is something wrong?
celery/billiard#288 · 29 comments · 2 reactions · 2 assignees · Opened Aug 19, 2019
BUG: Pool not closing pipes after close and join
May be free again @gautamp8 claimed this 2083 days ago, and no pull request is open. Open
- Is something wrong?
Issue Type: Bug

celery/billiard#282 · 16 comments · 7 assignees · Opened Jul 24, 2019
non-deamon processes in Pool
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 20/100

celery/billiard#280 · 2 comments · Opened May 9, 2019
Pools not being properly closed in contexts
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#277 · Opened Apr 10, 2019
billiard.pool map function getting hang
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#258 · 1 comment · Opened Nov 28, 2018
Does this library support shared variables?
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

celery/billiard#256 · Opened Oct 19, 2018
FORKED_BY_MULTIPROCESSING not being set anymore
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 38/100

celery/billiard#247 · 3 comments · Opened Jul 2, 2018
Getting the "C extension is not installed" error
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#244 · 1 comment · Opened Apr 28, 2018
billiard.Manager broken in billiard 3.5.0.3 in python 2.7, used to work in 3.3.0.21
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#242 · 5 comments · 2 reactions · Opened Apr 17, 2018
SoftTimeLimitExceeded inherits from Exception
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

celery/billiard#240 · 6 comments · 23 reactions · Opened Feb 13, 2018
ThreadPool seems to be broken (python 2.7.14, billiard 3.5.0.3): "no attribute _writer"
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#238 · 3 comments · 1 reaction · Opened Jan 10, 2018
Abnormal task termination
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 32/100

celery/billiard#236 · 9 comments · Opened Oct 24, 2017
WorkerLostError: Worker exited prematurely: signal 4 (SIGILL).
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#227 · 5 comments · Opened Jun 16, 2017
Python 3.6 - Broken Logger handling
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 35/100

celery/billiard#223 · 4 comments · 1 reaction · Opened May 12, 2017
OSError: [Errno 24] Too many open files
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

celery/billiard#217 · 7 comments · Opened Apr 14, 2017
Manylinux wheels
May be free again @auvipy claimed this 3406 days ago, and no pull request is open. Open
- Is something wrong?
celery/billiard#208 · 1 comment · 1 assignee · Opened Jan 5, 2017

celery/billiard

Is celery/billiard beginner-friendly?

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