Re: [Postgres-xc-general] An article about XC at PgCon

On 2012/06/08, at 20:19, Michael Vitale <mic...@ar...> wrote:

> How do you undo an initdb?  In the case where I want to redefine the initdb differently.  Also, I did the gmake uninstall, but it didn't remove any binary installed files.
Let's take the problems one-by-one.
For initdb, you need to delete the data folder and then recreate it. I don't think Postgres can redefine a data folder with initdb and just returns an error telling that existing data folder is not empty.
gmaje uninstall should work. At least in the environments used here it does.
> 
> Also, does postgres-xc work well as a High Availability solution, i.e., automatic failover?
You will need to plug in yourself slave nodes to your master nodes and having  a monitoring engine that performs failover. You got the same problems with Postgres. Its core features cannot perform a failover themselves and you always need to kick something to perform a failover in case of a node failure.
> 
> I come from an oracle RAC world, and I am playing with postgres-xc 1.0.0 on 2 centos 6, 64 bit boxes.
> 
> Oracle has failover embedded in its listener configuration and in its jdbc driver.  For instance, the oracle jdbc driver for our jboss server is something like this:
> 
> <connection-url>jdbc:oracle:thin:@(description=(address_list=(load_balance=on)(failover=off)(address=(protocol=tcp)(host=odb0-vip.arin.net)(port=1521))(address=(protocol=tcp)(host=odb1-vip.arin.net)(port=1521)))(connect_data=(service_name=pjpn.arin.net)(failover_mode=(type=select)(method=basic))))</connection-url>
> 
> Note that 2 oracle nodes are specified right within the oracle jdbc driver.  For normal PostgreSQL, the driver would look something like this:
> <connection-url>jdbc:postgresql://dbproto1.arin.net:5432/pjpn</connection-url>
> 
> So, I'm wondering if there is already a way to specify more than one cordinator in the jdbc connection string for connecting to postgres-xc?
I am not a specialist of jdbc, but I don't think you can specify multiple connection points in.
> 
> If not, then I reckon its up to me to implement a vip switched node that would automatically point to another cordinator if the first vip went down.
Yep think so. The core features of xc should be sufficient for a correct failover.
> 
> Comments, suggestions?
> 
> 
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