If you're upgrading an application that many users rely on (like the Apache on your busy Web server), then it pays to be extremely careful.
如果您正在升级对许多用户都有影响的应用程序(如繁忙的Web服务器上的Apache)，则倍加小心是值得的。
Then, develop a load balancing program using an algorithm, technique, or tool to redirect visitor and Web requests from a busy server to freely-available servers.
然后使用某种算法、技术或工具开发一个负载平衡程序，实现将繁忙的服务器上的访问者和Web请求重定向到清闲可用的服务器上。
WEB Server is too busy to respond to your request. Please choose another download address or try again later.
服务器忙，请换一个下载地址或者使用镜像地址下载。
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