On Fri, Apr 27, 2012 at 11:18 PM, Kevin Grittner <kevin.gritt...@wicourts.gov> wrote: > Andres Freund <and...@2ndquadrant.com> wrote:
> I'm not convinced that I would rather see the logic fixed inside the > master as opposed to being deployable on the master's machine, the > slave machine, or even on its own machine in between. There are use cases where the translation from WAL to logical takes place on the master, the standby or other locations. It's becoming clear that filtering records on the source is important in high bandwidth systems, so the initial work focuses on putting that on the "master", i.e. the source. Which was not my first thought either. If you use cascading, this would still allow you to have master -> standby -> logical. Translating WAL is a very hard task. Some time ago, I did also think an external tool would help (my initial design was called xfilter), but I no longer think that is likely to work very well apart from very simple cases. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
