PostgreSQL 9.0 - Hot Standby, Streaming Replication | Hacker News Reader

PostgreSQL 9.0 - Hot Standby, Streaming Replication

depesz.com

185 pointsgleb15 comments

Fuck Yeah!

I have never been satisfied with a piece of software as I am with Postgres.

Fact: 11 year old version of postgres are still actively maintained.

For those of you running postgresql with some kind of multi-server setup, how do you do load balancing and replication right now?

I'm running pgpool-ii but just tonight noticed some pretty serious discrepancies between the two backend postgresql instances so I am getting rid of pgpool for the time being.

Will this change make pgpool-ii obsolete?

I'm not an expert, but PgPool also servers as a local connection pooler, so for those purposes it won't be obsoleted.

I'd personally recommend pgbouncer as a connection pooler rather than pgpool.

https://developer.skype.com/SkypeGarage/DbProjects/PgBouncer

I second that, I did a comparison a few years ago and pgbouncer blew pgpool away:

http://www.last.fm/user/Russ/journal/2008/02/21/zd_postgres_...

Thanks guys.

The last place I worked used F5s for load balancing and Bucardo for replication. The F5s worked well enough, and I've become a huge fan of Bucardo. It has capabilities that I think blow Slony away. (Custom code, and pre-warmed slaves are two of the biggest differentiators.)

The new job is doing something that could best be described as very primitive sharding (completely unnecessary, given the demonstrated loads compared to the levels of concurrency PostgreSQL can support with minimal tuning), without replication. I'm eliminating the former, and will eventually be adding some HA capabilities, and probably also bringing Bucardo in.

I don't think SR is going to obsolete a connection pool any time soon -- you still need to direct traffic appropriately between master and slave(s). I've never used it, but I've consistently heard good things about pgBoucner as a connection pooler.

slony worked well enough at my last job

We use londiste (from SkyTools). It's excellent. From what I've read, londiste already plans to start offering streaming replication (vs. trigger-based replication) for the transport mechanism.

I have nothing to add except for: yay!

I'd like for the PostgreSQL team to add synchronous replication :) (ideally as a per transaction setting)

Well, exactly this is planed for a future release: http://wiki.postgresql.org/wiki/Streaming_Replication#Future...

This is definitely big news for PostgreSQL. When I had to set up replication for one of the projects I was working on I was highly dssapointed with all the solutions out there. I'm really excited that this will be built in and it looks like it will be really simple to get set up and working.

I agree, yay!

Ironically all I see is "Error establishing a database connection" when I visit the site

This is just more evidence that it's one of the greatest pieces of open source software ever written.

"Error establishing a database connection"

They running wordpress on mysql or something?

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