fix: 修复 switchServerAsync 在重连进行中导致的阻塞问题#867
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xiaomudk wants to merge 1 commit intonacos-group:masterfrom
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fix: 修复 switchServerAsync 在重连进行中导致的阻塞问题#867xiaomudk wants to merge 1 commit intonacos-group:masterfrom
xiaomudk wants to merge 1 commit intonacos-group:masterfrom
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fix #863
问题描述：
当网络故障发生时，reconnect 协程会进入长时间运行的 for 循环（可能持续数分钟）。
在此期间，任何对 switchServerAsync 的调用都会阻塞，因为 reconnectionChan（buffer=1）
已满。这会导致：
根本原因：
switchServerAsync 使用阻塞式发送（reconnectionChan <- ...），当 channel 满且
reconnect 还在处理时会无限期阻塞。
解决方案：
使用 select/default 实现非阻塞发送。当重连已经在进行中时，直接跳过新请求，
而不是阻塞等待。