Re: Minimal logical decoding on standbys

Hi,

On 2019-06-04 15:51:01 +0530, Amit Khandekar wrote:
> After giving more thought on this, I think it might make sense to
> arrange for the xl_running_xact record to be sent from master to the
> standby, when a logical slot is to be created on standby. How about
> standby sending a new message type to the master, requesting for
> xl_running_xact record ? Then on master, ProcessStandbyMessage() will
> process this new message type and call LogStandbySnapshot().

I think that should be a secondary feature. You don't necessarily know
the upstream master, as the setup could be cascading one. I think for
now just having to wait, perhaps with a comment to manually start a
checkpoint, ought to suffice?

Greetings,

Andres Freund