On 1/15/17 1:48 PM, Petr Jelinek wrote:
> It's meant to decouple the synchronous commit setting for logical
> replication workers from the one set for normal clients. Now that we
> have owners for subscription and subscription runs as that owner, maybe
> we could do that via ALTER USER.
I was thinking about that as well.
> However I think the apply should by
> default run with sync commit turned off as the performance benefits are
> important there given that there is one worker that has to replicate in
> serialized manner and the success of replication is not confirmed by
> responding to COMMIT but by reporting LSNs of various replication stages.
Hmm, I don't think we should ship with an "unsafe" default. Do we have
any measurements of the performance impact?
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
