Thread: Re : Very asynchrnous replication system

Re : Very asynchrnous replication system

From

Laurent ROCHE

Date:

08 October 2007, 08:37:19

Ben,

As far as I can see MusicBrainz only does one way replication (which I already achieved).
Two ways replication (without re-sending the information you have just received) is a bit more complex.

I could not find much info on the MusicBrainz project anyway.

Thanks,
L@u
The Computing Froggy

----- Message d'origine ----
De : Ben <bench@silentmedia.com>
À : Laurent ROCHE <laurent_roche@yahoo.com>
Cc : pgsql-general@postgresql.org
Envoyé le : Samedi, 6 Octobre 2007, 2h49mn 59s
Objet : Re: [GENERAL] Very asynchrnous replication system

The MusicBrainz project replicates in a way that sounds like it could fit your needs. It depends on a lot of perl, but if that's not a showstopper, then maybe adapting their replication scheme would work for you.

On Oct 5, 2007, at 5:25 PM, Laurent ROCHE wrote:

Hello,

I must replicate (or synchronise) data between disconnected postgreSQL databases ... hence a replication "very asynchronous"!

Application description
This an application to manage sales forces with a central application (and postgreSQL server) where everybody in the office can connect (this a web application: Tomcat with Spring 2+ Struts 2 + iBatis + PostgreSQL).
But there are also "little itinerant applications": the sales rep have the application on their laptop and a PosgreSQL server with a copy of the data (they are interested in ) from the main server database.
From time to time, the sales reps connect to the internet and request a data synchronisation: they send their modification and receive the headquarters modification.
(no problem about data overlap: the data owner is clearly identified by the application framework)

My problem:
Does such an existing system (the replication one) exist ?
I search the web I did not find anything !
I have started to do something (with triggers, log table and table export - using DDL-Utils) ... but looking at the spreadth of the task layed out in front of me, I am thinking that I will be better off using or adapting an existing replication system

Have fun,
L@u
The Computing Froggy

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Re: Re : Very asynchrnous replication system

From

Ben

Date:

08 October 2007, 16:29:51

Oh, sorry, I misread your question and didn't realize the distributed
copies would need to make modifications back. AFAIK, the MusicBrainz
system is master/slave, not multi-master.

On Mon, 8 Oct 2007, Laurent ROCHE wrote:

> Ben,

As far as I can see MusicBrainz only does one way replication (which I already achieved).
Two ways replication (without re-sending the information you have just received) is a bit more complex.

I could not find much info on the MusicBrainz project anyway.

Thanks,
L@u
The Computing Froggy

The MusicBrainz project replicates in a way that sounds like it could fit your needs. It depends on a lot of perl, but
ifthat's not a showstopper, then maybe adapting their replication scheme would work for you.
On Oct 5, 2007, at 5:25 PM, Laurent ROCHE wrote:

Hello,

I must replicate (or synchronise) data between disconnected postgreSQL databases ... hence a replication "very
asynchronous"!

Application description
This an application to manage sales forces with a central application (and postgreSQL server) where everybody in the
officecan connect (this a web application: Tomcat with Spring 2+ Struts 2 + iBatis + PostgreSQL).
But there are also "little itinerant applications": the sales rep have the application on their laptop and a PosgreSQL
serverwith a copy of the data (they are interested in ) from the main server database.
From time to time, the sales reps connect to the internet and request a data synchronisation: they send their
modificationand receive the headquarters modification.
(no problem about data overlap: the data owner is clearly identified by the application framework)

My problem:
Does such an existing system (the replication one) exist ?
I search the web I did not find anything !
I have started to do something (with triggers, log table and table export - using DDL-Utils) ... but looking at the
spreadthof the task layed out in front of me, I am thinking that I will be better off using or adapting an existing
replicationsystem

Have fun,
L@u
The Computing Froggy

Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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