Re: [RFC][PATCH] wal decoding, attempt #2 - Design Documents (really attached)

On 10/15/2012 4:43 PM, Simon Riggs wrote:
> Jan spoke at length at PgCon, for all to hear, that what we are
> building is a much better way than the trigger logging approach Slony
> uses. I don't take that as carte blanche for approval of everything
> being done, but its going in the right direction with an open heart,
> which is about as good as it gets.

The mechanism you are building for capturing changes is certainly a lot
better than what Bucardo, Londiste and Slony are doing today. That much
is true.

The flip side of the coin however is that all of today's logical
replication systems are designed Postgres version agnostic to a degree.
This means that the transition time from the existing, trigger based
approach to the new WAL based mechanism will see both technologies in
parallel, which is no small thing to support. And that transition time
may last for a good while. We still have people installing Slony 1.2
because 2.0 (3 years old by now) requires Postgres 8.3 minimum.

Jan

--
Anyone who trades liberty for security deserves neither
liberty nor security. -- Benjamin Franklin