MySQL备份导致的waiting for global read lock

最近业务高峰期间经常会有开发跳起来说应用连接数据库超时了！   我们来看下mysql的运行状态   Waiting for release of readlock：等待释放全局锁 The thread is waiting for a global read lock obtained by another thread (with FLUSH TABLES WITH READ LOCK) to

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