Re: Minimal logical decoding on standbys

Hi,

On 2019-07-12 14:53:21 +0530, tushar wrote:
> On 07/10/2019 05:12 PM, Amit Khandekar wrote:
> > All right. Will do that in the next patch set. For now, I have quickly
> > done the below changes in a single patch again (attached), in order to
> > get early comments if any.
> Thanks Amit for your patch. i am able to see 1 issues  on Standby server -
> (where  logical replication slot created ) ,
> a)size of  pg_wal folder  is NOT decreasing even after firing get_changes
> function

Even after calling pg_logical_slot_get_changes() multiple times? What
does
SELECT * FROM pg_replication_slots; before and after multiple calls return?

Does manually forcing a checkpoint with CHECKPOINT; first on the primary
and then the standby "fix" the issue?

> b)pg_wal files are not recycling  and every time it is creating new files
> after firing get_changes function

I'm not sure what you mean by this. Are you saying that
pg_logical_slot_get_changes() causes WAL to be written?

Greetings,

Andres Freund