On Tue, Jan 11, 2022 at 04:48:59PM +0530, RKN Sai Krishna wrote: > Hi All, > > I have a very basic question related to replication slots. Why should > the master/primary server maintain the replication slot info like lsn > corresponding to each standby server etc. Instead, why can't each > standby server send the lsn that it needs, and master/primary server > maintain the minimum lsn across all of the standby servers so that the > information could be used for cleanup/removal of WAL segments?
Because the information is needed even if the standby servers are not available, and if you only have a global xmin then you can't do much when removing one of the slots.
