- Author
Omer Katz (
omer.drow at gmail.com)
Change history
What's new documents describe the changes in major versions, we also have a changelog that lists the changes in bugfix releases (0.0.x), while older series are archived under the history section.
Celery is a simple, flexible, and reliable distributed programming framework to process vast amounts of messages, while providing operations with the tools required to maintain a distributed system with python.
It's a task queue with focus on real-time processing, while also supporting task scheduling.
Celery has a large and diverse community of users and contributors, you should come join us on IRC <irc-channel> or our mailing-list <mailing-list>.
To read more about Celery you should go read the introduction <intro>.
While this version is mostly backward compatible with previous versions it's important that you read the following section as this release is a new major version.
This version is officially supported on CPython 3.6, 3.7 & 3.8 and is also supported on PyPy3.
Table of Contents
Make sure you read the important notes before upgrading to this version.
The 5.0.0 release is a new major release for Celery.
Starting from now users should expect more frequent releases of major versions as we move fast and break things to bring you even better experience.
Releases in the 5.x series are codenamed after songs of Jon Hopkins. This release has been codenamed Singularity.
This version drops support for Python 2.7.x which has reached EOL in January 1st, 2020. This allows us, the maintainers to focus on innovating without worrying for backwards compatibility.
From now on we only support Python 3.6 and above. We will maintain compatibility with Python 3.6 until it's EOL in December, 2021. We may choose to extend our support if a PyPy version for 3.7 will not become available by then but we don't guarantee we will.
— Omer Katz
As we'd like to provide some time for you to transition, we're designating Celery 4.x an LTS release. Celery 4.x will be supported until the 1st of August, 2021.
We will accept and apply patches for bug fixes and security issues. However, no new features will be merged for that version.
Celery 5.x is not an LTS release. We will support it until the release of Celery 6.x.
We're in the process of defining our Long Term Support policy. Watch the next "What's New" document for updates.
Note
This wall was automatically generated from git history, so sadly it doesn't not include the people who help with more important things like answering mailing-list questions.
Please read the important notes below as there are several breaking changes.
The supported Python Versions are:
- CPython 3.6
- CPython 3.7
- CPython 3.8
- PyPy3.6 7.2 (
pypy3)
Celery now requires Python 3.6 and above.
Python 2.7 has reached EOL in January 2020. In order to focus our efforts we have dropped support for Python 2.7 in this version.
In addition Python 3.5 does not provide us with the features we need to move forward towards Celery 6.x. Therefore, we are also dropping support for Python 3.5.
If you still require to run Celery using Python 2.7 or Python 3.5 you can still use Celery 4.x. However we encourage you to upgrade to a supported Python version since no further security patches will be applied for Python 2.7 and as mentioned Python 3.5 is not supported for practical reasons.
Starting from this release, the minimum required version is Kombu 5.0.0.
Starting from this release, the minimum required version is Billiard 3.6.3.
Due to eventlet/eventlet#526 the minimum required version is eventlet 0.26.1.
Starting from this release, the minimum required version is gevent 1.0.0.
The Couchbase result backend now uses the V3 Couchbase SDK.
As a result, we no longer support Couchbase Server 5.x.
Also, starting from this release, the minimum required version for the database client is couchbase 3.0.0.
To verify that your Couchbase Server is compatible with the V3 SDK, please refer to their documentation.