Celery interview questions For Freshers & Experienced

Celery Message-oriented asynchronous task queue/job queue implementation for Python web applications that are based on distributed message passing approach1. It is released under ‎a BSD License and used by internet giants like Instagram, AdrolL, Mozilla Addons and many more.

Major features of Celery framework are

• Job Scheduling
• Job Monitoring
• Managing Workflows
• Time & Rate Limiting
• Autoloading and Resource Leak Protection.

In Celery broker is a mediator between clients and workers. The main task of the broker is to deliver the client messages to a worker.

Dramatic is one of the most popular alternatives to Celery Python. It supports Redis and RabbitMQ message brokers.

To install Celery via pip run below commnad

pip install -U Celery

Celery is written in Python programming language.

Celery worker is a supervisor process that does not process any tasks itself rather than that Celery spawns child processes (or threads) and deals with all the book keeping stuff.

Celery backend is a storage place that is used for storing the task results.Currently Celery supports only AMQP, database, cache, Couchbase, and Redis backends.

Celerybeat is a task scheduler that sends predefined tasks to a celery worker at a given time.

Pub-Sub expended as publish-subscribe or producer-consumer is a distributed messaging pattern where publishers broadcast messages over a message broker, and subscribers listen for the messages.