Re: Resetting recovery target parameters in pg_createsubscriber

HI Michael,

Thank you for the review!

> Why not just
> switch recovery_params_set to false once ReplaceRecoveryConfig() is
> called?

Stupid me!

> Why do we need to call again GenerateRecoveryConfig() when resetting
> recovery.conf/postgresql.conf.sample with its original contents before
> switching the system ID of the new replica?  I may be missing
> something, of course, but we're done with recovery so I don't quite
> see the point in appending the recovery config generated with the
> original contents.  If this is justified (don't think it is), this
> deserves a comment to explain the reason behind this logic.

This relates to the point I mentioned earlier about being unsure whether we
should preserve `primary_conninfo`:
> I kept primary_conninfo as-is for now since I'm not totally sure if we
need to touch it

The reason I called `GenerateRecoveryConfig()` was to regenerate the
`primary_conninfo` string in the recovery configuration file. If we should
remove it, then the reset function can be much simpler. Could you please
help me to clarify should we regenerate `primary_conninfo` or we can safely
purge it?

Best regards,
Alena Vinter