On Wed, Jan 11, 2012 at 11:38 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> The obvious first use case for this is for cache invalidation.
>
> Yeah, upthread Simon pointed out that propagating notifies would be
> useful for flushing caches in applications that watch the database in a
> read-only fashion. I grant that such a use-case is technically possible
> within the limitations of a slave server; I'm just dubious that it's a
> sufficiently attractive use-case to justify the complexity and future
> maintenance costs of the sort of designs we are talking about. Or in
> other words: so far, cache invalidation is not the "first" use-case,
> it's the ONLY POSSIBLE use-case. That's not useful enough.
Many people clearly do think this is useful.
I personally don't think it will be that complex. I'm willing to
review and maintain it if the patch works the way we want it to.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services