This setting helps the server ramp up smoothly, without having connection timeouts during the ramp-up phase.
该设置帮助服务器顺利地完成自举，在自举阶段不存在连接超时。
Retransmission timer expires for a connection for the first time or the fast retransmit phase is turned on.
连接的重新传输计时器首次计时到期，或者打开了快速重新传输阶段。
Fast-retransmit phase is turned on for a connection.
对于某个连接，打开了快速重新传输阶段。
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