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Here is my design:
- licanhua January 29, 20151, "Download worker". input: URL, output: URL & documentation
2, "URL extract worker". Input: documentation, output: URLs
3, "URL feed". it accept URLs and then prepare to dispatch URLs to works. you can choose message queue or any technology.
4, "URL judgement". "URL extract worker" parse the document and output URLs. URL judgement component will lookup DB/memcache/... and decide if we need add all or parts fo URLs to "URL feed".
5, URL key and value storage. the value can includes URL expiration time, URL downloaded document location, size, ... we can use memcache, DB...
6, background thread. it can check the URL key and value storage periodically. if a URL expired, we send the URL to "URL feeder" to update the documents and URLs
In this design, I don't use DFS or complex algo, but it's easy to support millions of URLs. all communication will be asynchronous messages.