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Distributed Task Queue
Task queues are used as a mechanism to distribute work across threads or
machines.
A task queue's input is a unit of work, called a task, dedicated worker
processes then constantly monitor the queue for new work to perform.
Celery communicates via messages, usually using a broker to mediate
between clients and workers. To initiate a task a client puts a message
on the queue, the broker then delivers the message to a worker.
A Celery system can consist of multiple workers and brokers, giving way
to high availability and horizontal scaling.
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