Hello,
attached is a simple patch which makes it possible to change the system
identifier of the cluster in pg_control. This is useful for
individualization of the instance that is started on top of data
directory produced by pg_basebackup - something that's helpful for
logical replication setup where you need to easily identify each node
(it's used by Bidirectional Replication for example).
--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services