These are limited resources as well, and having too many concurrent requests may cause failures, such as failure to allocate a JDBC connection.
这些也都是有限资源，有太多的并发请求也可能引起失效，例如不能分配JDBC连接。
Too many user...... service not available, closing control connection. This may be a reply to any command if the service knows it must shut down.
连接用户数已满……服务不可用，控制连接关闭。这可能是对任何命令的回应，如果服务认为它必须关闭。
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