I tried Postgres-XC and it doesn't implement full SQL yet (like SERIAL)
Postgres-R looks interesting but it's "not production ready" according to developers.
So I used pgpool-II 3.0.1. Yes, it works nicely. But as far as I can see it's only for 2 PG nodes.
Is there anything out there that is actually production ready AND capable of working with multiple PG nodes?