Re: Minimal logical decoding on standbys

Hi,

On 2019-05-30 19:46:26 +0530, Amit Khandekar wrote:
> @@ -1042,7 +1042,8 @@ ReplicationSlotReserveWal(void)
>  if (!RecoveryInProgress() && SlotIsLogical(slot))
>  {
>     ....
>  }
>  else
>  {
> -   restart_lsn = GetRedoRecPtr();
> +   restart_lsn = SlotIsLogical(slot) ?
> +                        GetXLogReplayRecPtr(&ThisTimeLineID) : GetRedoRecPtr();
> 
> But then when I do pg_create_logical_replication_slot(), it hangs in
> DecodingContextFindStartpoint(), waiting to find new records
> (XLogReadRecord).

But just till the primary has logged the necessary WAL records? If you
just do CHECKPOINT; or such on the primary, it should succeed quickly?

Greetings,

Andres Freund