客户端调用服务器在一定压力下（非常小的并发）报错，且 get connection 非常长

2022-11-11 17:24:04.180 WARN 2267 --- [service-tomcat-1163] o.a.s.m.c.publish.SlowInvocationLogger : 56 slow(1000 ms) invocation, CONSUMER rest crmadapter.crmAdapterService.queryProdInstIot:
http method: POST
url : /ICRMAdapterService/queryProdInstIot/
server : rest://10.0.3.138:8081
status code: 408
total : 40004.524 ms
prepare : 0.22 ms
handlers request : 32122.667 ms
client filters request : 0.78 ms
send request : 0.355 ms
get connection : 32122.307 ms
write to buf : 0.448 ms
wait response : 0.0 ms
wake consumer : 0.0 ms
client filters response: 0.0 ms
handlers response : 0.0 ms
2022-11-11 17:24:04.181 ERROR 2267 --- [service-tomcat-1163] c.h.m.p.e.GlobalExceptionHandler : 118 RuntimeException:

org.apache.servicecomb.swagger.invocation.exception.InvocationException: InvocationException: code=408;msg=CommonExceptionData{code='SCB.00000004', message='Invocation Timeout.', dynamic={}}
at org.apache.servicecomb.core.provider.consumer.SyncResponseExecutor.guardedWait(SyncResponseExecutor.java:90)
at org.apache.servicecomb.core.provider.consumer.SyncResponseExecutor.waitResponse(SyncResponseExecutor.java:58)
at org.apache.servicecomb.core.provider.consumer.InvokerUtils.innerSyncInvokeImpl(InvokerUtils.java:210)
at org.apache.servicecomb.core.provider.consumer.InvokerUtils.lambda$decorateSyncRetry$cf34ec48$2(InvokerUtils.java:263)

Start with the supplied SlowInvocationLogger output and the stack-trace entry points SyncResponseExecutor.java, InvokerUtils.java, and the client connection-acquisition path. Reproduce the timeout with the reported low concurrency, then trace why get connection consumes most of the request time. Done means the cause is identified and the timeout behavior is corrected and verified.

Written by the indexing model from the issue text.