From: | Chris Browne <cbbrowne(at)acm(dot)org> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Slightly OT. |
Date: | 2007-06-01 20:04:02 |
Message-ID: | 603b1b30i5.fsf@dba2.int.libertyrms.com |
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Lists: | pgsql-general |
gonzales(at)linuxlouis(dot)net 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.
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...
--
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"It seems certain that much of the success of Unix follows from the
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