How to Loadbalance a Postgres BDR Cluster I'm planning to use BDR (by 2ndQuadrant) to setup a multi master cluster for my PostgreSQL Databases. how can i achieve real loadbalancing for read and write Operations? I dont want to do it on the application side.

Is it a good idea to combine pgpool and a BDR Cluster, given that pgpool seems to be able to Balance only Select-Queries or is there a better way to distribute load over the whole cluster?
No it's bad idea to combine BDR with pgpool. 

Instead this you can use HAProxy load balancer which have various ACL rules which can be configured for your BDR cluster.