On 14/03/16 10:48, Craig Ringer wrote:
>
> You btw can emulate asking for the specific LSN in SQL interface by
> first calling the pg_logical_slot_get_changes function with upto_lsn
> set to whatever lsn you expect to start at, but it's ugly.
>
>
> Ugh.
>
> I didn't realise pg_logical_slot_get_changes could backtrack by setting
> an upto_lsn in the past. That doesn't seem like something we should
> really be doing - if it's a limit, and we're already past that limit, we
> should just be returning the empty set.
>
Not past, future from the point of old confirmed_lsn at least. The point
was that the next call will start from whatever lsn you specified as
upto_lsn.
-- Petr Jelinek http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training &
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