Re: [Postgres-xc-general] Move from a single-cluster machine to a multi cluster machine.

XC needs some more infrastructure to be such kind of HA, besides automatic monitoring and failover RA.

1. Maintain replica of each piece of distributed tables,
2. Allow operation to run with some of the nodes missing.

I don’t think its high technical challenge but will need some development resources.

Regards;
---
Koichi Suzuki

2014/08/22 5:59、Mason Sharp <ms...@tr...<mailto:ms...@tr...>> のメール：



On Thu, Aug 21, 2014 at 4:32 PM, Joseph Mays <ma...@wi...<mailto:ma...@wi...>> wrote:
What they are looking for in the end is high-availability and load balancing. They want either system to be able to receive read and write requests, and for either one to be able to take over all the work if the other is down. My understanding is that postgres-xc is capable of this, it’s just a matter of getting there from where they are. All of this would be easier if their current database server weren’t running on one of the machines that needs to be in the two-machine cluster when we’re done.

And yes, minimizing downtime is a priority, too.


How heavy are the writes? If it is read-mainly, you could be ok. With what you describe, all tables would have to be designated as replicated, adding latency. Or, you could define two datanodes, and have a warm standby on each of the other's portion.

In any event, Postgres-XC does not have automated high availability. You would have to have something external monitor and decide when to failover. I have used Corosync/Pacemaker for example.


--
Mason Sharp

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


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