I have a cluster of three nodes A, B, C and I'm using postgres bdr for replication
This isn’t the right mailing list for this topic. Core PostgreSQL doesn’t have BDR so this seems like it should be directed to whichever product is providing that capability. I’m pretty sure that nothing in core PostgreSQL ties nodes to data. But if you want to explore this on the community lists you want to send to the -general list, not -hackers. Per our community mailing list listing:
"The PostgreSQL developers team lives here. Discussion of current development issues, problems and bugs, and proposed new features. If your question cannot be answered by people in the other lists, and it is likely that only a developer will know the answer, you may re-post your question in this list. You must try elsewhere first!"
