My first Chinese book has been published on 1st June.
In the standard setup of Citus, it has one coordinator, so it is the single point of failure and the bottle neck of the system.
To solve these disadvantages, I built a multi-coordinator using Streaming Replication, which is the built-in replication feature of PostgreSQL.
I found an interesting postgres cluster management system using Pacemaker. It is created by GoCardless. They provide a vagrant box, so we can play and learn it easily.