"Active/active clustering of DB nodes" This is being developed as Postgres-XC. They released version 1.0 in June 2012. "Postgres-XC is an open source project

"Active/active clustering of DB nodes" This is being developed as Postgres-XC. They released version 1.0 in June 2012. "Postgres-XC is an open source project to provide a write-scalable, synchronous multi-master, transparent PostgreSQL cluster solution. " http://postgres-xc.sourceforge.net/ http://postgres-xc.sourceforge.net/