networked machine running celeryd. This can be one or more machines depending on the workload. The result of the task can be stored for later retrieval (called its “tombstone”). 1.1.3 Example You probably execute the task in the background, or wait for it to finish: >>> result = add.delay(4, 4) >>> result.wait() # wait for and return the result 8 Simple! 4 Chapter 1. Getting Started Celery Documentation Values Task return values can be saved to the selected result store backend. You can wait for the result, retrieve it later, or ignore it. Result Stores Database, MongoDB, Redis, Cassandra, or AMQP (message

Steps Celery is… Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list [http://groups (exp) and more… Concurrency prefork (multiprocessing), Eventlet, gevent threads/single threaded Result Stores AMQP, Redis memcached, MongoDB SQLAlchemy, Django ORM Apache Cassandra Serialization pickle for using Redis as a message transport or as a result backend. celery[mongodb]: for using MongoDB as a message transport (experimental), or as a result backend (supported). celery[sqs]: for using Amazon

Celery is. . . • Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list and an gevent 2.2. Getting Started 7 Celery Documentation, Release 3.1.25 • threads/single threaded • Result Stores • AMQP, Redis • memcached, MongoDB • SQLAlchemy, Django ORM • Apache Cassandra • Serialization celery[redis] for using Redis as a message transport or as a result backend. celery[mongodb] for using MongoDB as a message transport (experimental), or as a result backend (supported). celery[sqs] for using Amazon

networked machine running celeryd. This can be one or more machines depending on the workload. The result of the task can be stored for later retrieval (called its “tombstone”). Example You probably want execute the task in the background, or wait for it to finish: >>> result = add.delay(4, 4) >>> result.wait() # wait for and return the result 8 Simple! Features Messaging Supported brokers include RabbitMQ Values Task return values can be saved to the selected result store backend. You can wait for the result, retrieve it later, or ignore it. Result Stores Database, MongoDB, Redis, Cassandra, or AMQP (message

Steps Celery is… Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list [https://groups SQS, and more… Concurrency prefork (multiprocessing), Eventlet, gevent solo (single threaded) Result Stores AMQP, Redis Memcached, SQLAlchemy, Django ORM Apache Cassandra, Elasticsearch Serialization for using the librabbitmq C library. celery[redis]: for using Redis as a message transport or as a result backend. celery[sqs]: for using Amazon SQS as a message transport (experimental). celery[tblib]:

Steps Celery is… Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list [http://groups SQS, and more… Concurrency prefork (multiprocessing), Eventlet, gevent solo (single threaded) Result Stores AMQP, Redis Memcached, SQLAlchemy, Django ORM Apache Cassandra, Elasticsearch Serialization for using the librabbitmq C library. celery[redis]: for using Redis as a message transport or as a result backend. celery[sqs]: for using Amazon SQS as a message transport (experimental). celery[tblib]:

Steps Celery is… Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list [http://groups SQS, and more… Concurrency prefork (multiprocessing), Eventlet, gevent solo (single threaded) Result Stores AMQP, Redis Memcached, SQLAlchemy, Django ORM Apache Cassandra, Elasticsearch Serialization for using the librabbitmq C library. celery[redis]: for using Redis as a message transport or as a result backend. celery[sqs]: for using Amazon SQS as a message transport (experimental). celery[tblib]:

Steps Celery is… Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list [http://groups SQS, and more… Concurrency prefork (multiprocessing), Eventlet, gevent solo (single threaded) Result Stores AMQP, Redis Memcached, SQLAlchemy, Django ORM Apache Cassandra, Elasticsearch Serialization for using the librabbitmq C library. celery[redis]: for using Redis as a message transport or as a result backend. celery[sqs]: for using Amazon SQS as a message transport (experimental). celery[tblib]:

Celery is. . . • Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list and an Release 4.1.0 • Concurrency • prefork (multiprocessing), • Eventlet, gevent • solo (single threaded) • Result Stores • AMQP, Redis • Memcached, • SQLAlchemy, Django ORM • Apache Cassandra, Elasticsearch • Serialization for using the librabbitmq C library. celery[redis] for using Redis as a message transport or as a result backend. celery[sqs] for using Amazon SQS as a message transport (experimental). 10 Chapter 2.

Celery is. . . • Simple Celery is easy to use and maintain, and it doesn’t need configuration files. It has an active, friendly community you can talk to for support, including a mailing-list and an Release 4.0.1 • Concurrency • prefork (multiprocessing), • Eventlet, gevent • solo (single threaded) • Result Stores • AMQP, Redis • Memcached, • SQLAlchemy, Django ORM • Apache Cassandra, Elasticsearch • Serialization for using the librabbitmq C library. celery[redis] for using Redis as a message transport or as a result backend. celery[sqs] for using Amazon SQS as a message transport (experimental). 10 Chapter 2.