On Tue, Oct 22, 2019 at 12:32:53PM +0300, Devrim Gündüz wrote: > When I run pg_basebackup in v12 against v11, standby server fails to connecto > primary with the following error: > > 2019-10-22 09:28:23.673 UTC [2375] FATAL: could not connect to the primary > server: invalid connection option "gssencmode" > > When I remove this from recovery.conf, it works fine. Looks like a bug to me > (we need to preserve backward compatibility). Comments?
You are referring to the connection string generated in primary_conninfo here, right? It would be nice to be more compatible here. This can be simply fixed by having an extra filter in GenerateRecoveryConfig() (different file between HEAD and REL_12_STABLE). I also think that there is more. On HEAD, channel_binding gets added to the connection string generated which would equally cause a failure with pg_basebackup from HEAD used for a v12 or older server. -- Michael
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