[lowwave]

>Also, if one can leverage multicast that's nice, but not only clouds have it disabled, and Aeron works fine with unicast to N.

How did that happened? Seems multicast is already built in, just use that for massive broadcast. Is TCP used just so we can get an ACK that it is received. Seems multicast and UDP shouldn't be a problem if we just want massive people to listen in on it, but if we want to also track these people then that is another story.

From a user perspective, use UDP/multicast all the way. Let the client to request something if it is dropped or missing or otherwise just multicast for everything.

[buybackoff]

I mean multicast is often disabled not only in the cloud DCs, but on-premises as well, intentionally for different reasons.