Service Location Protocol: RFC 2608
RSerPool: RFCs 5351-6
It's a really interesting pub/sub style IPC. But really it's like a swiss-army knife. CORBA lovers (and haters) will recall IDL, it's used as the description for the interfaces used. IMO the commercial implementations are more feature complete than the open source ones.
If you looked at CORBA in the 1990s and have a sour taste in your mouth, don't hold it against DDS. It's a really great approach. It describes interfaces with a dynamically negiotiated Quality-of-Service among participants. The set of reactions to QoS policy violations effectively create hooks for all of your interesting cases.
IMO DDS works best when all of your participants share a broadcast domain, but it's not necessary to set it up that way.
Corba had service location, and I assume many other predecessors did as well.
Doesn't bother me though, stuff gets reinvented and rediscovered all the time.
The more recent approaches, like linkerd tend to also include ways to easily wrap existing services without changing them, which is a plus.