gonzales@xxxxxxxxxxxxxx writes: > I'm disappointed because SLONY-II has not been released yet to support > multi-master replication! PostgreSQL is going through all of the > releases - and that's great - BUT, where is the sync-up with the > powerhouse of a component, that Slony-II would bring to the table? > Slony-I is pretty sweet, but if Slony-II would release, I can imagine > that this would introduce some major competition in the enterprise > world against the commercial dyno's. There is some effort still going into Postgres-R from a research perspective, but as far as I know, nobody has been working on Slony-II for well over a year now. Unfortunately, a combination of factors went together to make it "not workable." - Spread licensing was something of an issue; - Spread scalability caused quite a few issues (it's apparently tough to make it stable when using it under HEAVY load); - There was a token passing bottleneck in Spread limiting its performance; - New application failure scenarios emerged that wouldn't have take place in non-MM systems. The issues built to the point of making it unworthwhile to continue development effort :-(. If someone completed a suitable reimplementation of the wheel on GCS, and produced something more usable for the purpose, such as the (theorized) Anasazi system, it might be worth proceeding again. http://www.lethargy.org/~jesus/archives/53-Lets-reimplement-the-wheel...-or-at-least-another-GCS..html But it's fair to say that reality did not live up to the early hopes. Supposing we came up with a Wicked Better GCS, that might merely allow efforts to get a bit further, and then hang up on something else. Don't hold your breath expecting Slony-II to be around any corners... -- let name="cbbrowne" and tld="acm.org" in name ^ "@" ^ tld;; http://linuxfinances.info/info/sap.html "It seems certain that much of the success of Unix follows from the readability, modifiability, and portability of its software." -- Dennis M. Ritchie, September, 1979
