Celery v5.5.0 Release Candidate 4 is now available for testing.
Please help us test this version and report any issues.
Key Highlights
See What’s new in Celery 5.5 (Immunity) or read the main highlights below.
Using Kombu 5.5.0rc2
The minimum required Kombu version has been bumped to 5.5.0.
Kombu is current at 5.5.0rc2.
Complete Quorum Queues Support
A completely new ETA mechanism was developed to allow full support with RabbitMQ Quorum Queues.
After upgrading to this version, please share your feedback on the quorum queues support.
- New documentation.
- New broker_native_delayed_delivery_queue_type configuration option.
New support for Google Pub/Sub transport
After upgrading to this version, please share your feedback on the Google Pub/Sub transport support.
Relevant Issues: #9351
Python 3.13 Improved Support
Additional dependencies have been migrated successfully to Python 3.13, including Kombu and py-amqp.
Soft Shutdown
The soft shutdown is a new mechanism in Celery that sits between the warm shutdown and the cold shutdown. It sets a time limited "warm shutdown" period, during which the worker will continue to process tasks that are already running. After the soft shutdown ends, the worker will initiate a graceful cold shutdown, stopping all tasks and exiting.
The soft shutdown is disabled by default, and can be enabled by setting the new configuration option worker_soft_shutdown_timeout. If a worker is not running any task when the soft shutdown initiates, it will skip the warm shutdown period and proceed directly to the cold shutdown unless the new configuration option worker_enable_soft_shutdown_on_idle is set to True. This is useful for workers that are idle, waiting on ETA tasks to be executed that still want to enable the soft shutdown anyways.
The soft shutdown can replace the cold shutdown when using a broker with a visibility timeout mechanism, like Redis or SQS, to enable a more graceful cold shutdown procedure, allowing the worker enough time to re-queue tasks that were not completed (e.g., Restoring 1 unacknowledged message(s)) by resetting the visibility timeout of the unacknowledged messages just before the worker exits completely.
After upgrading to this version, please share your feedback on the new Soft Shutdown mechanism.
Relevant Issues: #9213, #9231, #9238
- New documentation for each shutdown type.
- New worker_soft_shutdown_timeout configuration option.
- New worker_enable_soft_shutdown_on_idle configuration option.
REMAP_SIGTERM
The REMAP_SIGTERM "hidden feature" has been tested, documented and is now officially supported.
This feature allows users to remap the SIGTERM signal to SIGQUIT, to initiate a soft or a cold shutdown using TERM
instead of QUIT.
Pydantic Support
This release introduces support for Pydantic models in Celery tasks.
For more info, see the new pydantic example and PR #9023 by @mathiasertl.
After upgrading to this version, please share your feedback on the new Pydantic support.
Redis Broker Stability Improvements
The root cause of the Redis broker instability issue has been identified and resolved in the v5.4.0 release of Kombu, which should resolve the disconnections bug and offer additional improvements.
After upgrading to this version, please share your feedback on the Redis broker stability.
Relevant Issues: #7276, #8091, #8030, #8384
Quorum Queues Initial Support
This release introduces the initial support for Quorum Queues with Celery.
See new configuration options for more details:
After upgrading to this version, please share your feedback on the Quorum Queues support.
What's Changed
- Bugfix: SIGQUIT not initiating cold shutdown when
task_acks_late=Falseby @Nusnus in #9461 - Fixed pycurl dep with Python 3.8 by @Nusnus in #9471
- Update elasticsearch requirement from <=8.16.0 to <=8.17.0 by @dependabot in #9469
- Bump pytest-subtests from 0.13.1 to 0.14.1 by @dependabot in #9459
- documentation: Added a type annotation to the periodic task example by @Avamander in #9473
- Prepare for (pre) release: v5.5.0rc4 by @Nusnus in #9474
New Contributors
- @Avamander made their first contribution in #9473
Full Changelog: v5.5.0rc3...v5.5.0rc4