maria-discuss team mailing list archive

[Guillaume Lefranc <guillaume.lefranc@xxxxxxxxxxx>]

Hi Tom,

I feel this is more an example than a general recommendation.
In production we don't usually change weights for a three-node cluster. You
may want to change weights in specific configurations only (e.g. 2 nodes in
a datacenter and 1 node in another datacenter).

Best,

On Sun, Dec 27, 2015 at 2:43 PM Tom Worster <fsb@xxxxxxxxxx> wrote:

> In the Galera docs
> <http://galeracluster.com/documentation-webpages/weightedquorum.html#weighted-quorum-for-three-nodes>
> I read
>
> When configuring quorum weights for three nodes, use the following pattern:
>
> node1: pc.weight = 2
> node2: pc.weight = 1
> node3: pc.weight = 0
>
> Under this pattern, killing node2 and node3 simultaneously preserves the *Primary
> Component*
> <http://galeracluster.com/documentation-webpages/glossary.html#term-primary-component>
> on node1. Killing node1 causes node2 and node3 to become non-primary
> components.
>
> The wording makes it sound as though this is a general recommendation.
> But, iiuc, this cluster of 3 nodes has a single point of failure: node1.
> How is this desirable?
>
> Tom
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-- 
Guillaume Lefranc
Remote DBA Services Manager
MariaDB Corporation