Re: [Postgres-xc-general] ERROR: Failed to get pooled connections

[Paulo P. <pj...@ub...>]

On 25/10/12 08:37, Vladimir Stavrinov wrote:
> On Thu, Oct 25, 2012 at 2:05 AM, Vladimir Stavrinov
> <vst...@gm...> wrote:
>> On Wed, Oct 24, 2012 at 11:18:59PM +0300, Andrei Martsinchyk wrote:
>>>    one of those solutions. Everybody wins.  If XC integrates one
>>>    approach it will lose flexibility in this area.
>> and gain much more users.
> OK. Paulo don't wants more users, because he don't like easy ways and
> simple things. But we all want flexibility. Flexibility is good thing
> and here is example.

I didn't say "I don't want more users". I just believe, based on my
experience, that subjects as advanced as the ones we're discussing don't
come easy. And they shouldn't in the sense that people should really
learn/know about what they're doing, regarding clustering, HA, etc.!

>
> We have cluster consists of 4 nodes. Nodes organized in groups. All
> data distributed between groups and every group contains the identical
> data, i.e. replicas. In this case with such model we have 3 options:
>
> 1. Read scalability only with 4 replicas in group.
> 2. Read and write scalability with 2 replicas per group.
> 3. Write scalability only with 1 replica per group.
>
> It is obvious: with more nodes we have more options, i.e. more
> flexibility. It means here the trade off between read and write
> scalability. And we don't need for this "CREATE TABLE ... DISTRIBUTE
> BY ..." I think it is enough for most cases.
>
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-- 
Paulo Pires