According to link, fdb seems to be only initializing metrics and split RequestStream in initEndpoints method, why not init resolve stream in this method as well? what’s the logic here?
An endpoint is default-initialized when it is serialized for the first time. Or more specifically: FlowReceiver::getEndpoint will initialize this lazily if it hasn’t before.
The reason we sometimes call initEndpoints explicitly is because of priority. If not done explicitly, each endpoint will have priority TaskPriority::DefaultEndpoint (and for most endpoints this is the correct behavior).