udp reuseport when reload/restart

[Gao,Yan(ACG VCP)]

How to handle udp/quic logical connection with reuseport when reload/restart. For tcp, old worker can only handle old established connection, and do not accept new connection ever.
It is possible with BPF? Although it is not good solution


PS, why do not add conn after accept when using epoll?

if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
    if (ngx_add_conn(c) == NGX_ERROR) {
        ngx_close_accepted_connection(c);
        return;
    }
}