MySQL Group Replication provides distributed state machine replication with strong coordination between servers. Servers coordinate themselves automatically when they are part of the same group. The group can operate in a single-primary mode with automatic primary election, where only one server accepts updates at a time. Alternatively, for more advanced users the group can be deployed in multi-primary mode, where all servers can accept updates, even if they are issued concurrently. This power comes at the expense of applications having to work around the limitations imposed by such deployments.
install mysql:
https://dev.mysql.com/downloads/mysql/
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mysql service 没启动
很多时候，电脑重启或者由于某些系统优化软件的影响，MySQL 服务被关闭了。
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按下快捷键
Win + R，输入services.msc，然后点击确定打开“服务”窗口。 -
在列表中向下滚动，寻找名为
MySQL或MySQL80（取决于你的版本）的服务。 -
检查它的“状态”：
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如果显示为空白，说明它没有运行。
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解决方法： 右键点击该服务，选择 “启动”。同时，建议将“启动类型”改为“自动”，这样以后电脑开机它就会自己运行了。
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通过命令行（CMD）强制启动
net start mysql(注：如果你的服务名是 MySQL80，请输 net start mysql80)
(注：如果你的服务名是 MySQL97，请输 net start mysql97)