regiond workers can use too many postgres connections

Each regiond worker can use 20 postgres connections plus 1 dedicated to the listener. So that is 21 connections per regiond worker.

Each regiond controller uses 4 workers:

21 * 4 = 84 connections

When you have 2 regiond controllers:

84 * 2 = 168 connections

Postgresql by default only allows 100 connections. That is more connections then Postgresql allows just to run 2 region controllers. It should be possible to run 2 region controllers without having to increase the number of postgresql connections that is allowed.