在生产环境上，由于数据库服务器升级，需要将数据服务切换至新的数据库服务，发现在切换过程中，存在2分钟获取不到连接的情况，导致这2分钟的数据库操作全部失败。线下也多次测试，问题必现。使用的腾讯云服务，整个切换过程大概是3~4秒，但是业务应用持续了2分钟sql报错，切换主要步骤如下（腾讯云提供）： HA切换分为两种逻辑，分别是Master OK状态下的切换和Master Down状态下的切换。 ....

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