Unless you really need some features that Apache provides I'd be tempted to use Varnish or HAProxy instead.
At a guess you're running out of threads and no more connections are being passed to the origin servers until a thread becomes free.
Your timeout / ping values seem quite high - what sort of response times are your expecting to see from the origin servers?
Have you load tested the individual origin servers to see what level of load the can cope with, and what's the load on them like during the load-balanced load test?
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除非您确实需要 Apache 提供的某些功能，否则我会倾向于使用 Varnish 或 HAProxy。
猜测您的线程已用完，并且在线程空闲之前不会再将连接传递到源服务器。
您的超时/ping 值似乎相当高 - 您期望从源服务器看到什么样的响应时间？
您是否对各个源服务器进行了负载测试，以了解它们可以应对什么级别的负载，以及在负载平衡负载测试期间它们的负载如何？
Unless you really need some features that Apache provides I'd be tempted to use Varnish or HAProxy instead.
At a guess you're running out of threads and no more connections are being passed to the origin servers until a thread becomes free.
Your timeout / ping values seem quite high - what sort of response times are your expecting to see from the origin servers?
Have you load tested the individual origin servers to see what level of load the can cope with, and what's the load on them like during the load-balanced load test?