Mastering Google App Engine

Pull queues

Besides push queues you have pull queues as well. The main differences between push and pull queues are summarized below:

• In push queues, tasks are thrown to your application, in pull queues, you would have to fetch tasks yourself.
• Because tasks are pushed to your application, Google App Engine takes care of scaling as well. New machine instances will be started when there's more load than a single instance can handle. And all that happens automatically. In case of pull queues, you are responsible for the scaling part yourself.
• When a task gets successfully executed in a push queue, it is automatically deleted by Google App Engine with no effort at your end. In case of pull queues, you have to do that yourself as well.
• In push queues, ...