An update… after manually removing the record for ‘node4’ from bdr.bdr_nodes, corresponding record in bdr.bdr_connections, and associated replication slot (with pg_drop_replication_slot), rejoining was successful.
I was under the impression that there is no need to perform manual cleanup before a removed node (with database dropped and recreated) rejoining a BDR group.
BDR1 requires that you manually remove the bdr.bdr_nodes entry if you intend to re-use the same node name.
