Convert MySQL and epoll based web crawler to use asynchronous MySQL calls to speed up web crawler. -- 2

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This problem is not easy. My solution 1: MySQL uses connection pooling to improve efficiency. (The number of connections is still limited, if you wait for processing, then it will affect the speed of the crawler). 2: When mysql is busy, the state is cached to disk. 3: mysql is idle to synchronize data 3: Of course, the above operation requires multiple threads.

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