guohao commented on issue #8124:
URL: https://github.com/apache/dubbo/issues/8124#issuecomment-875724629
> such as:
>
> ```
> public void connectSync() {
> this.initPromise.awaitUninterruptibly(this.connectTimeout);
> long start = System.currentTimeMillis();
> while (!isAvailable()) {
> if(System.currentTimeMillis() - start <= connectTimeout) {
> Thread.yield();
> }
> }
> }
> ```
All threads will wait as long as `connecTimeout` when the downstream service
is unavailable.
A passthrough `Promise` will be better in some negotiation scenarios such as
H/2, ,the `Connection` will be available when the promise has been done
@xiaoheng1
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