This document describes the current stable version of Celery (4.0). For development docs, go here.

Change history

This document contains change notes for bugfix releases in the 4.0.x series (latentcall), please see What’s new in Celery 4.0 (latentcall) for an overview of what’s new in Celery 4.0.


release-date:2016-11-04 02:00 P.M PDT
release-by:Ask Solem

See What’s new in Celery 4.0 (latentcall) (in docs/whatsnew-4.0.rst).


release-date:2016-11-02 01:30 P.M PDT

Important notes

  • Database result backend related setting names changed from sqlalchemy_* -> database_*.

    The sqlalchemy_ named settings won’t work at all in this version so you need to rename them. This is a last minute change, and as they were not supported in 3.1 we will not be providing aliases.

  • chain(A, B, C) now works the same way as A | B | C.

    This means calling chain() might not actually return a chain, it can return a group or any other type depending on how the workflow can be optimized.