Distributed Task Queue

Celery is a task queue/job queue based on distributed message passing. It is focused on real-time operation, but has support for scheduling as well.

The execution units, called tasks, are executed concurrently on one or more worker servers, asynchronously (in the background) or synchronously (wait until ready).

Celery is already used in production to process millions of tasks a day.

It was first created for Django, but is now also usable from Python. It can also operate with other languages via HTTP+JSON.

Example

This is a simple task adding two numbers:

from celery.decorators import task

@task
def add(x, y):
    return x + y

You can execute the task in the background, or wait for it to finish:

>>> result = add.delay(8, 8)
>>> result.wait() # wait for and return the result
16

Getting Started

1. Install celery by download or pip install -U celery
2. Set up RabbitMQ or one of the ghetto queue solutions.
3. Select one of the following guides:
   • First steps with Python
   • First steps with Django

Community

There is a mailing-list available for general discussion.

For those craving real, human interaction, there is also an IRC channel (#celery on irc.freenode.net).

Finally, if you find a bug or would like to request a feature, please submit an issue.