[Feature Request] 互为主备的mysql其中一个挂掉,SequelizeConnectionRefusedError
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Description
## Background
互为主备的mysql,其中一个挂掉,如何重连到另一个,目前我的做法是在最后一层中间件看error是否为`SequelizeConnectionRefusedError`,如果是就关闭当前进程,让master重新拉起一个worker。是否有更好的方案
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