mysql 2003: Can't connect to MySQL server on '127.0.0.1:3306' (99)
连接断开的频率太高导致报错,可以在每次连接之间sleep,或者保持一个长连接。
ref:https://stackoverflow.com/questions/24884438/2003-cant-connect-to-mysql-server-on-127-0-0-13306-99-cannot-assign-reques
http://www.fromdual.com/huge-amount-of-time-wait-connections
https://vincent.bernat.im/en/blog/2014-tcp-time-wait-state-linux
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