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Use Modal Dicts and Queues together

Modal Dicts and Queues store and communicate objects in distributed applications on Modal.

To illustrate how Dicts and Queues can interact together in a simple distributed system, consider the following example program that crawls the web, starting from some initial page and traversing links to many sites in breadth-first order.

The Modal Queue acts as a job queue, accepting new pages to crawl as they are discovered by the crawlers and doling them out to be crawled via .spawn.

The Dict is used to coordinate termination once the maximum number of URLs to crawl is reached.

Starting from Wikipedia, this spawns several dozen containers (auto-scaled on demand) and crawls about 100,000 URLs per minute.