Re: [PATCH] Add initial xid/mxid/mxoff to initdb

On 05.05.22 17:47, Maxim Orlov wrote:
> During work on 64-bit XID patch [1] we found handy to have initdb 
> options to set initial xid/mxid/mxoff values to arbitrary non default 
> values. It helps test different scenarios: related to wraparound, 
> pg_upgrade from 32-bit XID to 64-bit XID, etc.
> 
> We realize, this patch can be singled out as an independent patch from 
> the whole patchset in [1] and be useful irrespective of 64-bit XID in 
> cases of testing of wraparound and so on.
> 
> In particular, we employed this patch to test recent changes in logical 
> replication of subxacts [2] and found no problems in it near the point 
> of publisher wraparound.

Just for completeness, over in the other thread the feedback was that 
this functionality is better put into pg_resetwal.