Re: [Postgres-xc-general] Info about permormance and high availability of postgres-xc

In HA, I don’t think Corosync/Pacemaker can deal with XC configuration, where many components are interrelated and they are HA-aware.    At present, Corosync/Pacemaker works well for HA-unaware components with master/slave pair model.   XC configuration is more complicated than what they can deal with.

Regards;
---
Koichi Suzuki

2014/10/20 18:05、Mason Sharp <ms...@tr...<mailto:ms...@tr...>> のメール：



On Sun, Oct 19, 2014 at 9:34 PM, Michael Paquier <mic...@gm...<mailto:mic...@gm...>> wrote:


On Sat, Oct 18, 2014 at 5:12 PM, Santiago Ibarbia <san...@gm...<mailto:san...@gm...>> wrote:
Hi, i'm studying informatics and we are doing an investigation of postgres-xc.
I searched information about that everyware and it isn't enough for making a presentation.
Can you give me a little more information or a document in where I could see more technical specifications??
You may find the Holy Grail here:
http://sourceforge.net/projects/postgres-xc/files/Presentation/

Just to provide a bit more background information to save some time for TL;DR cases-

Performance:

OLTP: coordinators add about 30% overhead. For linear scalability, we would expect 10 nodes to have about 7x performance compared to vanilla PostgreSQL. Instead it is 6 - 6.4 in DBT-1 tests, a TPC-W like benchmark.

OLAP: it depends on your schema, but if denormalized and quite simple, you can expect pretty much linear scalability. With a more complicated schema or queries, more nodes may perform worse than native PostgreSQL.

HA:

There is no automatic failover. You can set up standbys of key cluster components, and fail them over manually. An alternative is to write your own monitoring and failover, or use Corosync/Pacemaker. If acceptable in your environment, it may even be preferable to manually failover to prevent false positives and having to deal with failback.

I hope that helps.


--
Mason Sharp

TransLattice - http://www.translattice.com<http://www.translattice.com/>
Clustered and Distributed Database Solutions


------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho_______________________________________________
Postgres-xc-general mailing list
Pos...@li...
https://lists.sourceforge.net/lists/listinfo/postgres-xc-general